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  • temperature  (226)
  • Springer  (225)
  • American Meteorological Society  (1)
  • American Physical Society
  • 2005-2009  (2)
  • 1985-1989  (154)
  • 1980-1984  (70)
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  • 101
    Electronic Resource
    Electronic Resource
    The effect of temperature on fruit set, seed set and seed germination in ‘Sonia’ × ‘Hadley’ hybrid Tea-rose crosses (1987)
    Springer
    Euphytica 36 (1987), S. 117-120 
    Details
    ISSN: 1573-5060
    Keywords: Rosa ; rose ; Hybrid Tea ; temperature ; fruit set ; seed set ; seed germination ; pollination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of temperature on fruit set, seed set and seed germination was studied in ‘Sonia’ × ‘Hadley’ Hybrid Tea-rose crosses. ‘Sonia’ mother bushes were grown at constant temperatures (10, 14, 18, 22, 26°C) in the greenhouses of the phytotron until fruit ripening. Fruit set, fruit weight and number of seeds increased as temperature was higher. Optimum temperatures were found for days to fruit ripening (18°C), seed germination (22°C) and number of seedlings per pollinated flower (22°C). Fruit weight and number of seeds were positively correlated. For crossing and the subsequent growing of seed-bearing plants 22°C was the most favourable temperature. Effects of temperature on pollen tube growth, fertilization and seed germination are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730654
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  • 102
    Electronic Resource
    Electronic Resource
    Pollen and pollination experiments. IX. The pioneer pollen effect in apple and pear related to the interval between pollinations and the temperature (1983)
    Springer
    Euphytica 32 (1983), S. 703-709 
    Details
    ISSN: 1573-5060
    Keywords: Malus ; apple ; Pyrus ; pear ; double pollination ; pollination interval ; temperature ; pioneer pollen ; seed set first pollen ; seed set second pollen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Double pollinations of apple and pear may double the seed production, to which the second pollen can contribute 3 times as many seeds as the first (pioneer) pollen, when the interval between pollinations is long enough (48 h) at low (≃ 10°C) or short enough (7 h) at high (≃ 20°C) temperatures. With shorter or longer intervals, the contribution of the second pollen to seed production diminishes. The dominance of the second pollen was attributed to promotion by the first one, the second pollen probably being optimally stimulated when the tubes of the first have passed about 1/3rd of the style. It is concluded that the effectiveness of the pioneer pollen method to overcome incompatibility, depends on whether the interval between pollinations can be usefully adjusted to both the environmentally (temperature) and inherently determined rate of pollen tube growth of the species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042150
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  • 103
    Electronic Resource
    Electronic Resource
    The inhibition of growth by sub-optimal temperatures and the potential for selection at the cellular level (1985)
    Springer
    Euphytica 34 (1985), S. 467-473 
    Details
    ISSN: 1573-5060
    Keywords: Lycopersicon esculentum ; tomato ; cell division ; carbon metabolism ; temperature ; cell culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary At present research into the inhibition of plant growth by sub-optimal temperatures is concerned with the examination of a large number of factors. No single aspect of the response to temperature has been found to be of paramount importance. As a consequence selection for low temperature tolerance is complicated. Here a new approach is proposed in which inhibition of cell division is regarded as a limiting process in growth under sub-optimal temperatures, and the role of other processes as the supply of substrate for cell division. This approach may be of use in the examination of the response of plant growth to temperature and could form the basis of a method for screening and selection for cold tolerance using cells in culture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022943
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  • 104
    Electronic Resource
    Electronic Resource
    Partial control of chromosome elimination by temperature in immature embryos of Hordeum vulgare L. x H. bulbosum L. (1985)
    Springer
    Euphytica 34 (1985), S. 869-874 
    Details
    ISSN: 1573-5060
    Keywords: Horacum spp. ; interspecifi hybridization ; embryonic development ; temperature ; chromosome elimination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Embryos derived from Hordeum vulgare L. x H. bulbosum L. were subjected in vivo to a range of temperatures, and the proportions of hybrid plants which retain both parental sets of chromosomes were determined. Elimination of the H. bulbosum genome was significantly increased at temperatures greater than 20°C and resulted in fewer hybrid plants compared with temperatures below 17.5°C. Embryos were also allowed to develop in situ at 15°C and then transferred to 26°C for 8, 16 or 24h during the first 7 days after pollination. A period of 16 h at 26°C (equivalent to at least one complete mitotic cycle) at 2–5 days after pollination was found to be sufficient to increase chromosome elimination significantly above the levels obtained at a constant 15°C. At this stage (2–5 days after pollination at 15°C) the mean embryonic cell number was 2.3–223.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035426
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  • 105
    Electronic Resource
    Electronic Resource
    Analysis of components controlling early flowering of chrysanthemum at low temperature (1989)
    Springer
    Euphytica 40 (1989), S. 121-126 
    Details
    ISSN: 1573-5060
    Keywords: Chrysanthemum morifolium ; chrysanthemum ; tolerance ; temperature ; days to flower ; breeding ; component analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Twenty seven clones of chrysanthemum, 19 of which were selected at low temperature, were flowered at 10, 14, 18 and 22°C. The number of days to flower in response to temperature could, for each genotype, be described by a parabola with the parameters: optimum temperature, days to flower at the optimum temperature and curvature which represents the sensitivity to temperature. The low-temperature selections did not have a reduced optimum temperature but reduced sensitivity to temperature accounted for most of the ability to flower at low temperature. The parameters may vary independently. Examples are given to show how these parameters can be combined to construct genotypes with a required temperature response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023306
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  • 106
    Electronic Resource
    Electronic Resource
    Photosynthetic characteristics of leaves developed at different irradiances and temperatures: an extension of the current hypothesis (1983)
    Springer
    Photosynthesis research 4 (1983), S. 87-97 
    Details
    ISSN: 1573-5079
    Keywords: acclimation ; irradiance ; photosynthesis ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Photosynthetic characteristics at high measurement irradiance were analyzed for single leaves of two C3 and one C4 species grown under twenty one combinations of irradiance level, irradiance duration, and air temperature in order to test the idea that photosynthetic characteristies developed by leaves in different environments are controlled by the daily amount of photosynthesis. Photosynthetic rates per unit area and mesophyll conductances at 25°C and air levels of CO2 and O2, and parameters for two photosynthesis models were used to characterize the photosynthetic properties of the leaves. Leaves with highest values of the photosynthetic parameters for each species were often developed in environments with irradiance levels below saturation for photosynthesis, and with only 12 hours of irradiance per day. Lower air temperature during growth increased the photosynthetic characteristics for a given irradiance regime. Photosynthetic characteristics had higher correlation coefficients with daily photosynthesis of mature leaves divided by 24-hour leaf elongation rates of young leaves, than with daily photosynthesis alone, indicating that photosynthetic characteristics may be related to a balance between photosynthesis and leaf expansion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041804
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  • 107
    Electronic Resource
    Electronic Resource
    The effect of different night conditions on the CO2 fixation in a lichen Xanthoria parietina (1987)
    Springer
    Photosynthesis research 12 (1987), S. 3-11 
    Details
    ISSN: 1573-5079
    Keywords: continuous light ; light intensity ; dark period ; temperature ; diurnal and seasonal CO2 fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract CO2 fixation was studied in a lichen, Xanthoria parietina, kept in continuous light, and with cyclic changes in light intensity, dark period or temperature. The diurnal and seasonal courses of CO2 exchange were followed. The rate of net photosynthesis was observed to fall from morning to evening, and this decline was more pronounced in winter than in summer. The maximal net photosynthetic rate, 223 ng CO2g-1dws-1, occured in winter and the minimum, 94 ng CO2g-1dws-1, late in spring. The light compensation point in summer was four times as high as in winter. In continuous light (180 or 90 μmol photons m-2s-1, 15°C) net photosynthesis decreased noticeably during one week, falling below the level maintained in a 12 h light: 12 h dark cycle. Photosynthetic activity did not decrease, however, in lichens held in continuous light (90 μmol photons m-2s-1) with cyclic changes of temperature (12 h 20 °C: 12 h 5 °C). Active photosynthesis was also maintained in light of cyclically changing intensity (12 h: 12 h, 15 °C) when night-time light was at least 75% lower than illumination by day. A dark period of 4 hours in a 24-h light:dark cycle was sufficient to keep CO2 fixation at the control level. It seems that plants need an unproductive period during the day to survive and this can be induced by fluctuations in light and/or temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019146
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  • 108
    Electronic Resource
    Electronic Resource
    Effect of temperature on ethylene biosynthesis in carnation petals (1985)
    Springer
    Plant growth regulation 3 (1985), S. 159-166 
    Details
    ISSN: 1573-5087
    Keywords: Carnation petals ; ethylene ; temperature ; EFE activity ; ACC synthase ; ACC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Carnation petals, at a stage in which they are already producing ethylene, show a sigmoidal dependency of ethylene production on temperature within the range of 0 to 30°C. An Arrhenius plot of these data show a break atca. 22°C in the straight lines connecting the points. The activity of the ethylene-forming enzyme (EFE), measured bothin vitro, using isolated membranes, andin vivo, using petals pretreated with 1-aminocyclopropane-1-carboxylic acid (ACC), shows an exponential dependency on temperature within the same range. Arrhenius plots of EFE activity fail to show any discontinuity. In contrast, ACC synthase activity measuredin vitro shows the same sigmoidal dependency on temperature as that of the intact petals. We suggest, therefore, that ACC synthase activity is the rate-limiting step mediating the influence of temperature on ethylene biosynthesis by carnation petals over the range studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01806055
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  • 109
    Electronic Resource
    Electronic Resource
    Embryonic development times of entomostracan zooplankton from Lake le Roux (Orange River, South Africa), and their possible relationships to seasonal succession (1985)
    Springer
    Hydrobiologia 127 (1985), S. 17-26 
    Details
    ISSN: 1573-5117
    Keywords: embryonic duration ; zooplankton ; temperature ; freshwater ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Embryonic development times of the principal entomostracan zooplankton of Lake le Roux, Orange River, South Africa, are described. Durations decreased monotonically with temperature over the thermal tolerance range and are described using Bělehrádek's equation. The present data are compared with other observations on rate-temperature responses of warm-water and temperate zooplankton. Small, but ecologically significant, differences are discerned. The possible significance of species-specific rate-temperature responses to the phenomenon of seasonal succession is explored.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00004659
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  • 110
    Electronic Resource
    Electronic Resource
    Influences of macronutrients and water temperatures on summertime survival of Macrocystis canopies (1984)
    Springer
    Hydrobiologia 116-117 (1984), S. 419-424 
    Details
    ISSN: 1573-5117
    Keywords: seaweed ; Macrocystis ; macronutrients ; temperature ; fertilizing ; canopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027713
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  • 111
    Electronic Resource
    Electronic Resource
    Photosynthetic response of Prorocentrum mariae-lebouriae (Dinophyceae) to different spectral qualities, irradiances, and temperatures (1985)
    Springer
    Hydrobiologia 128 (1985), S. 143-153 
    Details
    ISSN: 1573-5117
    Keywords: photosynthetic productivity ; infra-red gas analysis ; spectral quality ; CO2 transients ; temperature ; dinoflagellate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Photosynthetic productivity (Ps) of the estuarine dinoflagellate Prorocentrum mariae-lebouriae (Parke and Ballantine) comb. nov., was measured with an open differential infra-red gas analysis system especially designed to measure CO2 uptake at a constant CO2 concentration. Ps was determined in six different fluorescent lamp spectral qualities (SQ) (daylight, blue, green, orange, orange-red and red) with bandwiths ranging from 50 to 75 nm and at photon flux densities (PFD) from 1.7 to 170 μmol of quanta s−1 m−2 to characterize the spectral response of daylight SQ grown P. mariae-lebouriae cultures. Ps was significantly higher for blue irradiation than for any other SQ. Compared to blue (100%) the following mean values were found: daylight 88%, green 79%, orange 29%, orange-red 56%, and red 87%. Differences were greatest at low PFD. Most measurements were performed at 20°C, but Ps was found to vary as a direct function of the culture temperature. A 10°C increase in temperature caused a 50% increase in Ps from 10° to 30°C with saturating PFD. Since the analytical system measured very small CO2 differentials, down to 0.5 μl l−1, we were able to detect small and fast CO2 transients at the beginning and end of an irradiation. These transients, known as CO2-‘burst’ and CO2-‘gulp’, increased in magnitude with increased PFD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008734
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  • 112
    Electronic Resource
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    Salinity-temperature tolerance of two closely related triclad species, Dugesia lugubris and D. polychroa (Turbellaria), in relation to their distribution in The Netherlands (1986)
    Springer
    Hydrobiologia 132 (1986), S. 279-286 
    Details
    ISSN: 1573-5117
    Keywords: Turbellaria ; triclads ; salinity ; temperature ; tolerance ; distribution ; habitat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The tolerance of adult specimens of Dugesia lugubris and D. polychroa for 13 different chlorinities ranging from 15.0–3.8‰ and for two temperatures, viz. 4 and 23 °C, was tested. At chlorinities of 7.5‰ and lower, the survival time of both species was considerably longer than at higher chlorinities (a few hours at 7.5‰, one to several days at 6.6‰ and lower concentrations). It is assumed that this is determined by the osmoregulatory capacity of the planarians. It was found that at low chlorinities combined with a high temperature D. polychroa survived longer than D. lugubris, while at the same chlorinities the opposite was true for a low temperature. The effect of temperature on survival at low chlorinities was more drastic for D. lugubris than for D. polychroa. The results correlate with data on the distribution of both species in The Netherlands. Outside areas with an average chlorinity below 2‰ the two species were rarely found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00046261
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  • 113
    Electronic Resource
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    Temperature and light: The determining factors in maximum depth distribution of aquatic macrophytes in Ontario, Canada (1986)
    Springer
    Hydrobiologia 133 (1986), S. 73-77 
    Details
    ISSN: 1573-5117
    Keywords: aquatic plants ; macrophytes ; maximum depth ; temperature ; light ; distribution ; stratified lakes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In stratified lakes with high light penetration, the maximum depth at which macrophytes occur is frequently limited by temperature. At this depth a variety of species may be found. On the other hand, when the clarity of water limits the light penetration and the temperature at depth is sufficient for good plant growth, the plants occurring at greatest depth are ones that do not require photosynthetic oxygen for root growth. Such plants include the Charales, Isoetes, Utricularia and Ceratophyllum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010804
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  • 114
    Electronic Resource
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    Generation time of Acanthocyclops robustus in relation to food availability and temperature in a shallow eutrophic lake (1989)
    Springer
    Hydrobiologia 182 (1989), S. 93-97 
    Details
    ISSN: 1573-5117
    Keywords: Acanthocyclops ; productivity ; temperature ; food limitation ; generation time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The generation time of the predatory cyclopoid copepod Acanthocyclops robustus was estimated on 11 occasions during the years 1980 to 1982 in Alderfen Broad. In a multiple regression model, generation time was found to be uncorrelated with temperature, positively correlated (p 〈 0.05) with the densities of Bosmina longirostris and rotifers, and negatively correlated (p 〈 0.001) with the density of nauplii of the calanoid copepod Eudiaptomus gracilis. It is suggested that generation time was determined largely by the availability of calanoid nauplii as prey, even though these constituted only 2% of zooplankton standing biomass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006035
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  • 115
    Electronic Resource
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    The effect of temperature on the development times of eggs, naupliar and copepodite stages of five species of cyclopoid copepods (1989)
    Springer
    Hydrobiologia 184 (1989), S. 79-88 
    Details
    ISSN: 1573-5117
    Keywords: Cyclopoid copepods ; development times ; eggs ; instars ; temperature ; diapause
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The duration times of eggs, combined naupliar instars and of the different copepodite stages of five species of cyclopoid copepods — Acanthocyclops robustus, Cyclops vicinus, Diacyclops bicuspidatus, Mesocyclops leuckarti, and Thermocyclops crassus — were investigated at five different temperatures. The five species can be divided in two groups: two species, C. vicinus and D. bicuspidatus, adapted to cold water conditions and three species, A. robustus, M. leuckarti and T. crassus adapted to warm water conditions. The cold water species showed a faster egg development than M. leuckarti and T. crassus at 5–15 °C. The eggs and instars of the warm water species M. leuckarti tend to develop faster than those of the former two species at higher temperatures. A. robustus showed the shortest egg and instar development at 10–25 °C. The warm water species T. crassus produced no eggs at 10 °C and temperatures below. At higher temperatures (20, 25 °C) the egg and instar duration times were similar or longer than those of the other species. When cultured in total darkness a great part of the CIV respectively CV copepodites of the summer forms entered arrest and the percentage of copepodites that showed an arrest of development was highest at lowest temperatures. The present results are compared with data from literature and differences are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014304
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  • 116
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    Salinity and temperature influence in rotifer life history characteristics (1989)
    Springer
    Hydrobiologia 186-187 (1989), S. 81-102 
    Details
    ISSN: 1573-5117
    Keywords: rotifers ; rate of population increase ; life span ; temperature ; salinity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A review of temperature and salinity effects on rotifer population dynamics is presented together with original data of these effects for three clones of Brachionus plicatilis. There is a clear relationship between temperature and the intrinsic rate of increase, r: an increase of temperature — within the natural environmental range — produces an exponential increase of r, and the slope of the response depends on the genotype. The effect of salinity is also genetically dependent; the highest r for each clone is observed at the salinity close to that of its environmental origin. The response of r to temperature is mainly a consequence of the response of the individual rates of development and reproductive timing. The effect of temperature on fecundity (number of descendents per individual life time) is negligible when temperature values are within the normal habitat ranges. On the other hand, salinity seems to affect primarily fecundity. The interaction salinity-temperature may be important in clones or species living in fluctuating environments with positive response to the more frequent combinations found in the corresponding habitats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00048900
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  • 117
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    The development of Hexarthra spp. in a shallow alkaline lake (1989)
    Springer
    Hydrobiologia 186-187 (1989), S. 129-136 
    Details
    ISSN: 1573-5117
    Keywords: Hexarthra ; salinity ; alkalinity ; wind action ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In Neusiedler See, a shallow alkaline lake with fluctuating water level and salinity, four species of Hexarthra occur: H. mira, H. fennica, H. jenkinae (occasional) and H. polyodonta. The analysis of longterm data reveals a general phenological pattern which does not change from year to year. They first occur in May, develop a maximum in June/July, sometimes a second one in August/September and disappear in October. But the species succession is different in the various years, occasionally only one species (H. mira or H. polyodonta) being present. There is a fairly consistent relation between the chemical conditions and the prevalent species; an increase in salinity favours the development of H. polyodonta. Low temperature and wind generated suspended particles have a negative influence on the development of the Hexarthra populations. Smaller populations of Hexarthra are in a relation to the occurrence of Leptodora indicating predation pressure of the latter species. In Neusiedler See the Hexarthra populations seem to be controlled to a great extent by abiotic factors, but predation by Leptodora and most probably by young fish seems to play an important role too.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00048904
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  • 118
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    Seasonal variations of metabolically active bacteria in a hypertrophic lake (Hartbeespoort Dam, South Africa) (1988)
    Springer
    Hydrobiologia 160 (1988), S. 179-188 
    Details
    ISSN: 1573-5117
    Keywords: microbial activity ; nalidixic acid ; reservoir ; temperature ; primary production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The number of metabolically active bacteria was measured with nalidixic acid over two annual cycles at three depths in the epilimnion of hypertrophic Hartbeespoort Dam, South Africa. Concurrent measurements were made of water temperature, DOC, phytoplankton production of dissolved (EDOC) and particulate organic carbon, chlorophyll a and the uptake of glucose (Vmax). The objective was to determine the dominant factors correlated to the number of metabolically active bacteria and the relationship between active bacterial numbers and heterotrophic activity. The number of active bacteria was usually highest at the surface and ranged between 0.70 and 6.82 x 106 cells ml−1. The dominant factors correlated to the number of bacteria at the surface were water temperature (r = 0.65, n = 54, p〈0.001), primary production (r = 0.53, n = 51, p〈0.001) and EDOC (r = 0.37, n = 45, p = 0.005). Surface Vmax for glucose ranged between 0.11 and 4.0 µgC 1−1 h−1 and was positively correlated to the number of active bacteria (r = 0.61, n = 53, p〈0.001). The specific activity index (10−12 µgC cell−1 h−1) varied between 80 and 2290 at the surface and was most strongly correlated to EDOC (r = 0.70, n = 48, p〈0.001). Relationships between active bacterial numbers, water temperature, phytoplankton activity and glucose uptake were also found at two additional depths within the epilimnion. These data suggest that bacterial populations in nutrient enriched lakes contain a large number of metabolically active cells with high individual activity as a result of enhanced phytoplankton growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00015481
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  • 119
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    A new pelagic marine rotifer from the southern Benguela, Synchaeta hutchingsi, n. sp., with notes on its temperature and salinity tolerance and methods of culture (1988)
    Springer
    Hydrobiologia 162 (1988), S. 225-233 
    Details
    ISSN: 1573-5117
    Keywords: rotifers ; Synchaeta ; temperature ; salinity ; culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A new species of marine rotifer is described from the S.E. Atlantic off Cape Town. Synchaeta hutchingsi n. sp. is unique among the approximately 36 recognized Synchaeta species in exhibiting the following combination of characters: single sharply pointed toe; slender bristle along ventral midline of foot: single lateral antenna on left side near foot base; spur on dorsal side of foot used to carry egg; total length 165–200 µm. Salinity tolerance experiments showed the new species to be obligate brackwater/marine; a temperature of 35 °C could be tolerated for a short period of time. The new species has been mass-cultured for use as an experimental live food for rearing marine fish larvae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00016670
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  • 120
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    Environmental cues used in upstream orientation by Parameletus chelifer and P. minor (Ephemeroptera) nymphs; an experimental study (1988)
    Springer
    Hydrobiologia 162 (1988), S. 235-241 
    Details
    ISSN: 1573-5117
    Keywords: Ephemeroptera ; upstream orientation ; pH ; DOM ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Experiments using a plexiglass Y -maze fluviarium showed that nymphs of Parameletus chelifer and Parameletus minor each used different environmental cues to orient. P. chelifer nymphs reacted to pH while nymphs of P. minor were very sensitive to concentration of dissolved organic matter. The capacity to detect these water quality differences was lost as soon as the nymphs reached seasonally submerged areas suitable for growth at the margin of the river. When nymphs of both species had reached their growing areas, water temperature became the crucial cue for orientation.
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    URL: http://dx.doi.org/10.1007/BF00016671
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  • 121
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    On the physical limnology of Georgian Bay (1988)
    Springer
    Hydrobiologia 163 (1988), S. 21-34 
    Details
    ISSN: 1573-5117
    Keywords: physical ; limnology ; temperature ; currents ; wind ; exchange
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Georgian Bay comprises the easternmost part of the Michigan-Huron water system and extensive data were collected here in 1974 by the Canada Centre For Inland Waters. Fifty-one stations were monitored between April and December of 1974; the time series recordings of currents and temperature at 10 locations, meteorological recordings at two buoys, and water level recordings from temporary gauges were carried out. Minimum surface temperature of 0 °C persists for one month commencing in late February and maximum surface temperatures occurred in early August (19 °C). The annual heat income for Georgian Bay was estimated to be 43 700 cal · cm−2. The exchange at Main Channel has a significant influence on water residence and flushing times in Georgian Bay which determines its trophic status.
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    Effect of temperature on growth, reproduction and survival of the freshwater planorbid snail, Gyraulus convexiusculus, vector of echinostomiasis (1988)
    Springer
    Hydrobiologia 164 (1988), S. 185-191 
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    ISSN: 1573-5117
    Keywords: freshwater snail ; growth ; reproduction ; survival ; temperature ; vector
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Studies were carried out to investigate the effects of 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40° and 45°C on growth, sexual maturity, reproduction and survival of the freshwater planorbid snail, Gyraulus convexiusculus, vector of echinostomiasis, under laboratory conditions. The growth rate of juvenile and sexually mature snails was at minimum at 15°C and was maximum at 35°C. Sexual maturation time was minimum at 35°C and maximum at 20°C. Fecundity was minimum at 15°C and maximum at 35°C. The minimum average and maximum number of eggs per egg capsule was reached at 35°C and lowest at 15°C. 30°C was the optimum temperature for survival of juvenile snails, while sexually mature snails reached maximum survival time at 20°C.
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    Effect of incubation and preservation on resting egg hatching and mixis in the derived clones of the rotifer Brachionus plicatilis (1989)
    Springer
    Hydrobiologia 186-187 (1989), S. 415-421 
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    ISSN: 1573-5117
    Keywords: Rotifera ; resting eggs ; light ; temperature ; hatching ; mixis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The marine rotifer Brachionus plicatilis typicus (Clone 8105A, Univ. of Tokyo) was cultured in 500 ml beakers to form resting eggs. Tetraselmis tetrathele was used as a culture food. Just after formation, resting eggs were exposed to various temperature (5–25 °C) and light regimes (24L: OD and OL : 24D). When eggs were exposed to light just after formation, the eggs hatched sporadically over a month. No hatching was observed for six months when eggs were preserved under dark conditions regardless of the temperature. These eggs hatched simultaneously after being exposed to light and eggs preserved at 5 °C showed twice as high hatching rate (40%) as that of eggs preserved at 15–25 °C (24%). Clones from resting eggs that were kept under different temperature and light regimes were reared individually to the third generation. Incubation at 25 °C with lighting produced the highest (5.4% and 5.2 %) rate of mictic females during their 2nd and 3rd generations, respectively. The lowest rates (0 and 1.5%) were found when the eggs were kept at 5 °C in total darkness for six months. A lower rate of amictic female production was found in clones with higher rates of mixis.
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    Effect of environment and formulation on the absorption and translocation of fenridazon in wheat (Triticum aestivum L.) (1988)
    Springer
    Plant growth regulation 7 (1988), S. 65-73 
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    ISSN: 1573-5087
    Keywords: Chemical hybridizing agent ; temperature ; relative humidity ; irradiance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Fenridazon [potassium 1-(p-chlorophenyl)-1,4-dihydro-6-methyl-4-oxopyridazine-3-carboxylate] is a registered chemical hybridizing agent causing male floral sterility and is used for the production of hybrid wheat (Triticum aestivum L.). Foliar absorption and translocation of fenridazon to the floral primordia was decreased at 4°C compared to 24°C. At 24°C, an increase in relative humidity from 40% to 85% increased fenridazon absorption 2.5 and 1.7 times when surfactants A and B, respectively, were used. Because of the increased absorption of fenridazon with increased relative humidity, the amount of fenridazon in the floral primordia was similarly increased 2.2 and 1.5 times for surfactant A and B, respectively. Although the amount of fenridazon in the floral primordia was increased with increased relative humidity, fenridazon translocation rate was not altered by relative humidity. The effects of irradiance on fenridazon absorption were minimal, but its translocation was decreased with low irradiances.
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    Phytoplankton ecology in an unusually stable environment (Montezuma Well, Arizona, U.S.A.) (1984)
    Springer
    Hydrobiologia 119 (1984), S. 149-160 
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    ISSN: 1573-5117
    Keywords: grazing ; Hyalella montezuma ; incident light ; phytoplankton ; seasonal succession ; stable environment ; temperature ; travertine spring
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Relatively minor annual amplitudes of change in certain major nutrients, and especially pH and water temperature were measured in the spring-fed system of Montezuma Well, Arizona during a four year study. phytoplankton diversity was low but for the most part, composition was spatially and temporally constant; total seasonal phytoplankton density was significantly correlated with regional incident light. Phytoplankton species composition changed briefly during and for a short period following the summer monsoon. Ultraplankton (〈5 µm diam.) numerically comprised nearly 80% of the phytoplankton community throughout most of the year. The limited residence time of water in the Well may have provided a competitive advantage for cells with high surface area:volume ratios and correspondingly rapid division rates. Nannochloris bacillaris Naum. and Coccomyxa minor Skuja were perennial dominants. Diatom populations did not increase with annual increases in vernal solar radiation. Low pH, high dissolved CO2, and limited residence time for metabolic inhibitors are considered to be largely responsible for the reduced blue-green populations in the Well. The only flagellated photosynthetic group present in Montezuma Well was the Cryptophyta. Desmid populations were minimal, even though pH was consistently below circumneutral (6.5) and free CO2 concentrations high. The role of grazing by an amphipod, Hyalella montezuma, on annual phytoplankton abundance is examined.
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    The relationship between temperature, competition and the potential for colonization of a subtropical pond by Daphnia magna (1986)
    Springer
    Hydrobiologia 134 (1986), S. 103-112 
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    ISSN: 1573-5117
    Keywords: temperature ; competition ; Daphnia ; subtropical
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The role that temperature plays in excluding large daphnid species from subtropical and tropical ponds, and competitive relationships between Daphnia laevis and Daphnia magna, are explored. D. magna, a large temperate species is probably not excluded from subtropical or tropical systems by elevated temperatures. However, D. magna was a poorer competitor, under a restricted set of laboratory conditions, than D. laevis, the only pond dwelling daphnid in subtropical Florida. Competition is proposed as one mechanism that may limit the number of daphnid species in subtropical and tropical ponds and lakes. Reduced environmental fluctuations in subtropical and tropical systems (compared with temperate systems) may allow zooplankton populations to reach an environmental carrying capacity where competition limits the number of similar, coexisting species in a habitat.
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    Effet des variables abiotiques sur la biomasse animale de sept mares temporaires d'eau douce du Québec méridional (1986)
    Springer
    Hydrobiologia 139 (1986), S. 143-152 
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    ISSN: 1573-5117
    Keywords: biomass ; invertebrates ; season ; temperature ; temporary pools ; volume
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aim of this study was to ascertain the influence of environmental variables on the seasonal variations of total animal biomass in temporary ponds. We thus collected weekly, in seven major types of mosquito-breeding habitats, a total of 163 samples and calculated the dry weight (µg/l) of 75 taxa, using the length-weight relationships described in the literature. The total biomass was found to be more stable than the proportions of individual taxa. Multiple regression analysis showed that most of the dispersion of total animal biomass could be explained by environmental variables, especially water temperature, volume of water body and season.
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    Long-term studies at a benthic station off the coast of Northumberland (1986)
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    Hydrobiologia 142 (1986), S. 121-127 
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    ISSN: 1573-5117
    Keywords: benthos ; stability ; density dependent mortality ; temperature ; organic enrichment ; North Sea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Biannual sampling (March and September) has been carried out over the period 1972 to 1985 at a muddy sand station, 55 m depth, with fauna belonging to the deeper offshore edge of Petersen's Amphiura filiformis community. During the period 1974 to 1980 the community exhibited a high degree of persistence stability. This stability was lost between 1980 and 1983, with rising total numbers and biomass and changes in species ranking. There is some evidence of a downward reversal between 1984–85. Evidence suggests that the principal stabilising process is density dependent mortality mediated by competition in a food limited environment. The principal destabilising process appears to be periodic fluctuations in the organic flux to the bottom. A secondary destabilising process is clearly concerned with fluctuating winter temperature. In competitive terms, cold winters favour increased survival in the dominant species at the expense of the lesser ranked species. This process is, however, more ephemeral and subject to adjustment within the time scale of a year.
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    Common patterns in the fluctuations of macrozoobenthic species living at different places on tidal flats in the Wadden Sea (1986)
    Springer
    Hydrobiologia 142 (1986), S. 199-207 
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    ISSN: 1573-5117
    Keywords: macrobenthos ; dynamics ; parallel fluctuations ; temperature ; eutrophication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract During 17 successive years (1969–1985) the macrozoobenthos has been sampled quantitatively in the latewinter/early-spring period at 15 stations scattered over Balgzand (a 50 km2 tidal flat area in the western-most part of the Wadden Sea) and at 5 stations located in a small (3 km2) area 150 km away from Balgzand in the eastern part of the Dutch Wadden Sea. In 25 species, numbers per m2 were, in most years, sufficiently high at 2 or more of the Balgzand stations to allow between-station comparisons of fluctuation patterns. Comparisons were made by rank correlation. Out of a total of 1003 of such comparisons that could be made with the Balgzand data, 47% yielded significantly positive correlations and less than 1% significantly negative ones. Thus, nearly half of the fluctuation patterns of the populations living at the 15 stations within the Balgzand area showed a high similarity. Synchronization of population fluctuations was augmented particularly by the incidence of severe winters (causing low spring numbers in about a quarter of the species that were sensitive to low temperatures and high reproductive success in several species during the subsequent summer) and further by the increasing trends in numbers in about half of the species, probably as a consequence of eutrophication. Similar results as on Balgzand were obtained within the restricted area Groninger Wad in the eastern part of the Dutch Wadden Sea (Essink & Beukema, this issue). Comparison of the fluctuation patterns between the 2 distant areas also yielded high numbers of significantly positive correlations, though the proportion of the patterns that were similar was lower than these proportions were within the 2 areas. It is concluded that common patterns of fluctuation in numerical densities of macrobenthic species can be assessed over vast areas. Such common patterns will represent the ‘normal’ or ‘base-line’ fluctuations that may be used to distinguish (as departures from such patterns) the effects of local disturbing influences.
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    Temperature and the biology and predation of Ilione albiseta (Diptera: Sciomyzidae) — Potential biological control agent of liver fluke (1988)
    Springer
    Hydrobiologia 166 (1988), S. 239-246 
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    ISSN: 1573-5117
    Keywords: Ilione albiseta ; Diptera ; Sciomyzidae ; larvae ; predation ; temperature ; biological control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of temperature on predation by Ilione albiseta (Diptera: Sciomyzidae) on Lymnaea peregra was investigated at 14°, 17°, 20°, 23° and 26°C. The mean dry weight of snail tissue (Lymnaea peregra) attacked and consumed per day by first and second instar I. albiseta larvae was highest at 20°C while for third instar and total larval duration period it was greatest at 23°C. The mean number of snails killed per day during the third instar was also highest at 23°C. The total amount of snail tissue consumed by I. albiseta larvae increased significantly from first to second instar and from second to third instar at each constant temperature. Mean survival period of unfed first instar larvae decreased from 28.4 days at 14°C to 11 days at 26°C and the mean length of the second instar cephalopharyngeal skeleton decreased with increasing temperatures. As temperature increased the rate of consumption of oxygen (dissolved in water) by first and third instar larvae rose.
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    Planktonic rotifers and temperature (1987)
    Springer
    Hydrobiologia 147 (1987), S. 307-317 
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    ISSN: 1573-5117
    Keywords: Rotifera ; planktonic ; temperature ; food ; embryonic development ; respiration rate ; ingestion ; population dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The influence of temperature (t) upon rotifer embryonic development rate (De) has been analysed using data from the literature, and the author's own results from experimental and natural populations. For Keratella cochlearis (Gosse), within the temperature range of 1–28°C, this relationship is best expressed by the equation: 1/De = 0.002 + 0.00025t + 0.000065t2. For Brachionus calyciflorus Pallas, between 8°C and 35°C, the best relationship is given by the equation: 1/De = 0.005 + 0.00013t + 0.00013t2. Increasing the incubation temperature to 37–40°C resulted in a decrease in development rate and a sharp reduction in life length. Analysis of the relationship between respiration rate and temperature in experimental and natural populations of Brachionus calyciflorus and Hexarthra mira (Hudson) showed that the maximum rate of oxygen consumption occurred at 32–33°C. The effects of temperature upon the ingestion rates of rotifers is greatly influenced by food concentration. Consequently, this factor also influences the secondary production of experimental populations at different temperatures.
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    Effect of algal diet and temperature on the embryonic development time of the rotifer Brachionus plicatilis in culture (1987)
    Springer
    Hydrobiologia 147 (1987), S. 319-322 
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    ISSN: 1573-5117
    Keywords: embryonic development ; algal food ; temperature ; Brachionus plicatilis ; culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The embryonic development times of two strains of Brachionus plicatilis (Bs and S-1) cultured on three different algal diets (Nannochloris oculata, N. maculata and Nannochloropsis gaditana), have been determined at 20°C, 25°C and 30°C. As expected, the embryonic development times decreased with increasing temperature in all cases. However, embryos from adults fed on N. gaditana tended to develop more slowly than those of individuals fed on the other algal species. Mean egg volume was also affected by diet, larger eggs being produced by females fed on N. gaditana. No obvious relationship between egg size and temperature was detected. Two principal factors seemed to affect the embryonic development time. The first was temperature which acts through its well known effect on metabolic rates. The second was maternal diet which probably affects development time through its effect on yolk content, as reflected in the size of the egg.
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    Effect of incubation temperature on the hatching of rotifer resting eggs collected from sediments (1987)
    Springer
    Hydrobiologia 147 (1987), S. 335-338 
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    ISSN: 1573-5117
    Keywords: Rotifera ; resting eggs ; temperature ; sediment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sediment samples from Loch Leven, Scotland, were incubated at 5°C, 10°C and 15°C to induce hatching of rotifer resting eggs. The emergent animals were identified and counted. The temperature which induced hatching varied among the nine species studied. These results are discussed in relation to seasonality and temperature preferences previously recorded for the most abundant species. Resting egg densities of 2.2–13.9 eggs cm−3 were recorded in the upper 5 cm of sediment.
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    Preliminary experiments on the cultivation of the brown alga Laminaria (Phaeophyta) Lamouroux in Brazil (1987)
    Springer
    Hydrobiologia 151-152 (1987), S. 381-385 
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    ISSN: 1573-5117
    Keywords: seaweed ; Laminaria ; mariculture ; light tolerance ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
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    URL: http://dx.doi.org/10.1007/BF00046157
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    Growth rates in culture of several species of Sargassum from Florida, USA (1987)
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    Hydrobiologia 151-152 (1987), S. 399-404 
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    ISSN: 1573-5117
    Keywords: seaweed ; growth ; light intensity ; mariculture ; temperature ; salinity ; Sargassum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
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    Seasonal fluctuations of growth rate and chemical composition of Gracilaria cf. conferta in outdoor culture in Israel (1987)
    Springer
    Hydrobiologia 151-152 (1987), S. 501-507 
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    ISSN: 1573-5117
    Keywords: seaweed ; Gracilaria ; growth rate ; agar composition ; light ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
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    URL: http://dx.doi.org/10.1007/BF00046174
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    Rotifer distribution in relation to temperature and oxygen content (1989)
    Springer
    Hydrobiologia 186-187 (1989), S. 209-214 
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    ISSN: 1573-5117
    Keywords: rotifers ; distribution ; temperature ; oxygen content
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lunzer Obersee, a small lake located at an altitude of 1100 m above sea level, was investigated from July 1985 to October 1987. The rotifer community consists of 7 dominant species, 7 subdominant species and 34 species which occasionally occurred in the plankton. The dominant species show rather different demands in relation to temperature and oxygen content; e.g.: Filinia hofmanni was found at a wide range of oxygen concentrations (0.6–13.3 mg O2l−1) and low temperatures (4–6 °O, living in the upper water layers (1–7 m) during spring and in the deeper, anoxic zone in summer. In contrast, Asplanchna priodonta was found at rather high oxygen contents (〉 9 mg O2 l−1), ), and showed a wide range of temperature tolerance (4–15 °C). On the basis of field data the temperature and oxygen requirements of several species are described and discussed.
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    Temperature aspects of ecological bioenergetics in Brachionas angularis (Rotatoria) (1989)
    Springer
    Hydrobiologia 186-187 (1989), S. 363-369 
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    ISSN: 1573-5117
    Keywords: rotifers ; temperature ; food concentration ; bioenergetic parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The influence of temperature and food quality was studied on the following energy balance parameters of B. angularis: ingestion, production, growth and mortality. The ingestion rate rises to an optimum at 15 and 20 °C and decreases at 25 °C. The other rates increase continuously over the 5–25 °C range. The Q10-values of production rate are higher than those of ingestion rate. Temperature also modifies the relationship between food concentration and bioenergetic rates. They react according to a Monod function (production at all temperatures, growth at 10 °C) or decrease at high concentrations (growth at 15° and 20 °C.)
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    Size variation in Brachionus plicatilis resting eggs (1989)
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    Hydrobiologia 186-187 (1989), S. 381-386 
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    ISSN: 1573-5117
    Keywords: biometric analysis ; resting eggs ; rotifers ; salinity ; temperature ; genetic variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of temperature and salinity on resting egg size of two Brachionus plicatilis (Rotifers) clones was investigated. Clones were selected according to their different behaviour in laying resting eggs: one clone ejects them, whereas they remain inside the females body in the other clone. The difference in resting eggs size between the two clones is noticeable, although the difference is not as great as that between female body size. An important temperature-salinity interaction on resting egg size has been observed. The general inverse relationship between size and temperature is only true at lower temperatures. At high temperatures size varies around the mean although could be greater than at intermediate temperatures. This is more evident at the intermediate salinity tested which is considered to be the closest to the optimum in our experiments. This pattern of variation suggests that mean size is bigger than expected, in relation to temperature and salinity, when these factors have values close to the extremes of their range, normally found in nature, and to which adaptative mechanisms can evolve. Size is bigger at the salinity — temperature low - low and high - high combinations which are the most commonly found in the temperate environments.
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    Microbial communities in southern Victoria Land streams (Antarctica) II. The effects of low temperature (1989)
    Springer
    Hydrobiologia 172 (1989), S. 39-49 
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    ISSN: 1573-5117
    Keywords: Antarctica ; bacteria ; biofilms ; cyanobacteria ; microbial mats ; Nostoc ; Phormidium ; photosynthesis ; respiration ; stream algae ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Water temperatures in southern Victoria Land streams fluctuated over the range 0 to 10 lay close to freezing. In a series of controlled assays at Fryxell Stream, Taylor Valley, the benthic microbial mats showed strongly positive metabolic responses to increases in temperature well above ambient. Rates of polysaccharide and lipid biosynthesis increased with temperature over the range 0 to 25 °C. Between 0 and 10 °C, Q10 values for the cyanobacterial mats were 1.7 to 3.2 for gross photosynthesis, 2.5 to 5.7 for respiration, 2.2 to 2.5 for acetate incorporation into lipid, 1.9 to 3.8 for glucose catabolism, and 1.9 to 2.8 for thymidine incorporation. Respiration accounted for a high percentage of gross photosynthesis, and a net respiratory loss of carbon from three communities was either induced or worsened by an increase in temperature from 0 to 10 °C. The chlorophyll a content of Nostoc disc incubated for one month in darkness decreased by 27% at 5 °C, but by 99% at 25 °C. This set of assays suggests that the cyanobacterial mats contained large amounts of chlorophyll a and carbon associated with inactive or senescing cells. This unusual standing stock could probably not persist under warmer conditions, which would promote both increased respiratory losses and faster rates of bacterial decomposition.
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    Seasonal periodicity of aquatic fungi in tanks at Kurukshetra, India (1989)
    Springer
    Hydrobiologia 173 (1989), S. 219-229 
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    ISSN: 1573-5117
    Keywords: aquatic fungi ; temperature ; seasonal periodicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The occurrence, distribution and seasonal periodicity of 49 species of aquatic fungi belonging to the orders Chytridiales, Lagenidiales, Blastocladiales, Saprolegniales and Peronosporales from two tanks of Kurukshetra, India, is described. Seasonal periodicity was found to be governed by temperature.
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    Light quality and growth of Norway spruce (Picea abies (L.)) (1988)
    Springer
    New forests 2 (1988), S. 281-287 
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    ISSN: 1573-5095
    Keywords: light quality ; Norway spruce ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Seedling of Norway spruce (Picea abies L.) were grown under three different light qualities in “fluid-roof” growth chambers. Blue light with a high red/far-red ratio decreased shoot length as well as total plant dry weight compared to natural light. Yellow light with a low blue/red ratio did not significantly affect the plants. The effects of light quality were generally the same at 18, 24 and 28 °C day temperature. Plant growth was reduced at temperatures above 24 °C.
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    Influence des factuers externes sur l'activité reproductrice de l'hirudinée rhynchobdelle Piscicola geometra L. (1984)
    Springer
    Hydrobiologia 118 (1984), S. 245-254 
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    ISSN: 1573-5117
    Keywords: leeches ; Piscicola geometra ; photoperiod ; temperature ; nutrition ; maturation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The annual cycle of P. geometra breeding activity depends on light, temperature and nutrition. A photoperiod of about 12-12 delays the genital maturation and prevents the incidence of breeding behaviour. A high temperature speeds up the genital maturation and above a threshold ranging from 15 to 17.5 °C it prevents light from acting. Fasting inhibits egg laying because of its immediate action on the clitellar gland activity. It only acts on oogenesis later.
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    Response of two species of amphibious stichaeoid fishes to temperature fluctuations in an intertidal habitat (1985)
    Springer
    Hydrobiologia 120 (1985), S. 151-157 
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    ISSN: 1573-5117
    Keywords: temperature ; estuary ; intertidal ; Stichaeidae ; Pholididae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The temperature regime of the intertidal microhabitat of two species of co-existing amphibious stichaeoid fishes, Anoplarchus purpurescens and Pholis ornata, were compared with experimentally determined tolerances to elevated temperatures. Studies of the critical thermal maxima of the two species revealed only slight differences in temperature tolerance but exposure to a cycled pattern of high temperatures sharply differentiated the resistance times of the two species with P. ornata capable of tolerating greater cumulative exposure to thermal stress when administered in a cycled program of temperature fluctuations with peak temperature at 27 °C. While the experimentally determined temperature tolerances exceeded those measured in the field, the greater tolerance of P. ornata may facilitate habitation of intertidal mudflats during summer months.
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    Reproductive ecology of Dendrocoelum lacteum (Turbellaria) in a rapid stream in southern Sweden and comparisons with a lake population (1986)
    Springer
    Hydrobiologia 132 (1986), S. 273-277 
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    ISSN: 1573-5117
    Keywords: Turbellaria ; stream ; temperature ; food ; reproduction ; phenology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rapid streams in southern Sweden are often inhabited by the triclad Dendrocoelum lacteum. Outside Fennoscandia, this species is mainly restricted to lentic habitats. The ‘normal’ food refuge for D. lacteum, the isopod Asellus aquaticus, is seldom found in the stream habitats, and probably the prey here is the amphipod Gammarus pulex. With respect to spatial and trophic niche components, it seems that D. lacteum has taken the place of Crenobia alpina in southern Sweden. Two parameters of reproduction, namely production of cocoons and of hatchlings, both peaked approximately one month later in a stream than in an adjacent lake. This difference was attributed to a low temperature regime in the stream. Number of hatchlings per cocoon and cocoon sterility were higher in the stream than in the lake. Similar cocoon and hatchling output per adult was found in the two habitats, indicating a similar reproductive effort for the two triclad populations. I suggest that D. lacteum, by virtue of its choice of microhabitat, viz., under stones, is not so vulnerable to the more severe stream environment.
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    Magnesium and strontium in non-marine ostracod shells as indicators of palaeosalinity and palaeotemperature (1986)
    Springer
    Hydrobiologia 143 (1986), S. 135-142 
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    ISSN: 1573-5117
    Keywords: palaeolimnology ; trace elements ; magnesium ; strontium ; salinity ; temperature ; calcite ; water chemistry ; palaeochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Measurements of the Ca, Sr, and Mg contents of individual calcitic shells of non-marine ostracods and their host waters, both in lakes and controlled aquaria, permit the calculation of the distribution coefficients of Sr/Ca and Mg/Ca partitioning in ostracod shells. We report new KD[Sr] for seven genera of non-marine ostracods and KD[Mg] for Cyprideis at 25°C. Strontium partitioning is virtually temperature-independent, and is related to the Sr/Ca of the host water, and in Ca2+-saturated waters, to the salinity of the water. Magnesium partitioning is dependent on both temperature and Mg/Ca of the host water. For simple closed-basin lakes (crater lakes are ideal), the Sr content of ostracods is a sensitive indicator of salinity and thus evaporation/precipitation changes, which in turn, indicate variations in continental climate. A 10000-year continuous palaeosalinity record established by Sr and Mg contents of fossil ostracods for Lake Keilambete, southeastern Australia, is in close agreement with an independent palaeosalinity estimate based on sediment textures. We suggest rules that allow Sr and Mg analyses of suites of individual fossil ostracod shells from lacustrine sediments to be interpreted in terms of palaeosalinity and palaeotemperature variations.
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    Effects of temperature pre-treatment, desiccation and aging on the viability of spores of halophilic blue-green algae (1983)
    Springer
    Hydrobiologia 106 (1983), S. 235-240 
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    ISSN: 1573-5117
    Keywords: Anabaena fertilissima ; Anabaenopsis arnoldii ; halophilic blue-green algae ; spore germination ; temperature ; desiccation ; aging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of temperature, desiccation and aging on the viability of spores of Sambhar salt lake blue-green algae, Anabaena fertilissima and Anabaenopsis arnoldii, were studied. Spores of A. arnoldii were found to be more susceptible to temperature variation, desiccation and storage than spores of A. fertilissima. Pre-treatment of spores with higher temperatures, 37° and 47°C, stimulated germination in A. fertilissima. In a sporulated filament, spores which developed first were generally bigger and more resistant to adverse environmental conditions than spores formed later. The differential loss of viability in spores of a filament may be due to certain intrinsic differences in the physiological/ biochemical properties of the spores.
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    Effect of temperature on selected microbial activities in aerobic and anaerobically incubated sediment (1985)
    Springer
    Hydrobiologia 126 (1985), S. 189-192 
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    ISSN: 1573-5117
    Keywords: sediment ; temperature ; oxygen ; carbon dioxide ; methanogenesis ; nitrogen fixation ; electron transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Electron transport system (ETS) activity, CO2 evolution, O2 consumption, N2-fixation (C2H2 reduction) and methanogenesis were appropriately measured in aerobic and anaerobically incubated sediment at 4, 10 and 20 ° C to better characterize these activities under different incubation conditions. ETS activity was always higher in the aerobically incubated sediment at all three incubation temperatures, whereas (C2H2 reduction was always greater in the anaerobic sediment. Carbon dioxide evolution was detected only in the aerobic sediment at 10 and 20 ° C but not at 4 ° C. Methane evolution in anaerobic sediment increased gradually with an increase in the incubation temperature.
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    Dissolved organic carbon fluctuations in Dal Lake waters (1988)
    Springer
    Hydrobiologia 166 (1988), S. 199-203 
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    ISSN: 1573-5117
    Keywords: dissolved organic carbon ; concentration ; variation ; correlation ; temperature ; pH ; fluctuation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dissolved organic carbon (DOC) fluctuations were studied in the surface water of Dal Lake from May 1984 to April 1985, at monthly intervals. Concentration of DOC varied from 0.140 mg l−1 to 0.725 mg l−1. A minimum was recorded in May and September, while an increase was observed during December and January. The fluctuations during the observation period showed a relationship with temperature and pH.
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    Biometric variation in three strains of Brachionus plicatilis as a direct response to abiotic variables (1987)
    Springer
    Hydrobiologia 147 (1987), S. 83-89 
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    ISSN: 1573-5117
    Keywords: Rotifera ; Brachionus plicatilis ; biometry ; size ; temperature ; salinity ; genotype
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Morphometric variation in three clones of Brachionus plicatilis cultured at 20°C, 25°C and 30°C, and 9‰, 12‰ and 24‰ salinity was analysed. Size appeared to be largely under genetic control and this defined the narrow limits within which variation due to abiotic factors could occur. Temperature had a significant effect on size, but affected the three clones differently. The most general effect of temperature was a reduction in size which levelled off as the temperature rose. Of the measurements taken, only distance between the median spines was affected by salinity. An important inter-relationship between the effects of temperature and salinity was also detected.
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    Growth responses of two Laminaria saccharina populations to environmental variation (1987)
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    Hydrobiologia 151-152 (1987), S. 229-232 
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    ISSN: 1573-5117
    Keywords: seaweed ; kelp ; Laminaria saccharina ; growth ; temperature ; salinity ; light
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
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    URL: http://dx.doi.org/10.1007/BF00046134
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    Factors influencing periphyton growth in agricultural streams of central Illinois (1989)
    Springer
    Hydrobiologia 174 (1989), S. 89-97 
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    ISSN: 1573-5117
    Keywords: carbon ; Illinois ; light ; nitrate ; nutrient limitation ; periphyton ; phosphate ; streams ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Factors limiting periphyton accrual in east-central Illinois agricultural streams were investigated. Nutrient-diffusing substrata were used to examine periphyton macronutrient limitation in streams in two agricultural watersheds. Substrata consisted of sand-agar mixtures with one of six experimental treatments. Macronutrients included carbon, nitrate, phosphate and combinations of the three. Substrata were collected after a 5 and 9 day period and analyzed for chlorophyll a. None of the treatments were significantly greater than the controls at any of the seven stations, thus we conclude that periphyton in these streams was not nutrient limited. Highest periphyton colonization/growth rates were associated with the smaller upstream reaches, while lower rates occurred in the larger downstream reaches. Multiple regression showed that most of the variance in the rate of chlorophyll a accrual after five days was explained through water temperature and turbidity (r2 = 0.91); whereas, stream nitrate and phosphate concentrations accounted for no significant portion of the variance. We conclude that instream primary production in agricultural streams of central Illinois is limited by temperature and light.
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    The zooplankton of a small tropical reservoir (Solomon Dam, North Queensland) (1988)
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    Hydrobiologia 157 (1988), S. 105-118 
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    ISSN: 1573-5117
    Keywords: Cladocera ; Rotifera ; Copepoda ; cyanobacteria ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper examines seasonal changes in the density and taxonomic composition of the zooplankton of a small tropical impoundment, in relation to factors of water temperature, food supply and reservoir flushing. The response of the zooplankton to management techniques designed to regulate the density of cyanobacteria in the dam are also considered. Cyclopoid copepods were the dominant zooplankters, although Cladocera became much more significant following the introduction of measures to control cyanobacteria. Planktonic Rotifera were a diverse but generally unimportant fraction of the total biomass, except following seasonal or management induced environmental perturbations, when the Rotifera often recovered most rapidly.
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    High-resolution profiles of temperature and dissolved oxygen in a river (1989)
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    Hydrobiologia 179 (1989), S. 17-24 
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    ISSN: 1573-5117
    Keywords: profiles ; resolution ; monitoring ; temperature ; oxygen ; spate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Longitudinal profiles of water quality along a well-mixed tidal river are, ideally, based on simultaneous measurements at fixed stations distributed along the river. The resolution of the profiles is limited by the density of the stations. However, for a given number of stations the resolution is greatly increased if water quality date can be extrapolated upstream and downstream of the stations, making use of velocity data; the resolution is then determined by the density of the extrapolated data points, which may be an order of magnitude higher than the density of the stations. A 15-km length of river was investigated using 5 current meters equipped to measure depth, temperature, conductivity and dissolved oxygen. Data were recorded simultaneously every 10 minutes. When the average cross-sectional speed was 0.25 ms−1 (typical of tidal conditions), the extrapolated data points were 150 m apart, so the resolution of the resulting profiles (7 per kilometre) was much higher than that of the stations alone (0.3 per kilometre). The extrapolation process required a means of deducing the average cross-sectional speed from the speed measured at a given station. The key to this was provided by temperature data recorded during the onset of a spate, when tidal flow was suspended and the average cross-sectional speed was uniformly about 0.75 ms −1 at four of the stations. Profiles of temperature and dissolved oxygen were generated by this method; the resolution was about 2 data points km−1 during the onset of the spate, and 6 points km−1 during tidal flow.
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    Rotifer occurrence in relation to temperature (1989)
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    Hydrobiologia 175 (1989), S. 223-231 
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    ISSN: 1573-5117
    Keywords: Rotifera ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Information on the distribution of 225 species of planktic, periphytic and benthic rotifers from diverse waters in south and central Sweden was analyzed for temperature preference and tolerance. Most rotifers have a very wide tolerance range. Certainly differences in temperature dependence exist between separate species. However, these differences are, in a regional material like this, generally less distinct than what has been found for the distribution within individual lakes.
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    Behavioral response of the New England dog whelk, Nassarius trivittatus, to a temperature gradient (1980)
    Springer
    Hydrobiologia 69 (1980), S. 79-81 
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    ISSN: 1573-5117
    Keywords: temperature ; behavior ; thermoregulation ; snail ; Nassarius trivittatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Thirty New England dog whelks (Mollusca: Gastropoda: Nassariidae), Nassarius trivittatus, were tested as a group for 3 days in a long linear gradient trough encompassing a thermal gradient ranging from 5°C to 45°C. The modal thermal preferendum of the snails lay between 30°C and 35°C. The lowest temperature interval voluntarily occupied by the snails was 15–20°C, the highest 35–40°C. W e believe this to be the first published study of temperature preference and avoidance behavior of gastropod molluscs.
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    Studies on the grazing rate of notholca squamula Müller on asterionella formosa hass. at different temperatures (1980)
    Springer
    Hydrobiologia 73 (1980), S. 79-81 
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    ISSN: 1573-5117
    Keywords: Rotifers ; diatoms ; temperature ; grazing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The grazing rate of Notholca squamula on Asterionella formosa has been estimated to be 3.2 cells per female per hour at 6°C and 11.5 cells per female per hour at 10°C.
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    On the ecology of notholca squamula muller in Loch Leven, Kinross, Scotland (1980)
    Springer
    Hydrobiologia 73 (1980), S. 177-180 
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    ISSN: 1573-5117
    Keywords: Rotifers ; temperature ; diatoms ; grazing
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    Topics: Biology
    Notes: Abstract Notholca squamula was rarely found in Loch Leven when the water temperature rose above 10°C. Under favourable temperature conditions its abundance appeared to be closely related to that of Asterionella formosa. In the laboratory the animal was seen to feed on this diatom by breaking open the frustule and ingesting the cell contents.
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    Estimating thermal properties of simulated aquatic soils from their composition (1981)
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    Hydrobiologia 80 (1981), S. 225-230 
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    ISSN: 1573-5117
    Keywords: aquatic ; temperature ; soil ; composition ; gas ; water ; annual change
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Heat penetration and thermal lag in the submersed soil surrounding the roots of aquatic plants depends on two fundamental thermal properties of the substrate, volumetric heat capacity (CV) and thermal conductivity (k). The relationship of these parameters to the fractions of organic and mineral matter, gas and water in natural and simulated aquatic soils was investigated. The gas fraction was found to be insignificant and it was possible to make good estimates of CV and k from a knowledge of substrate water content alone.
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    Temperature dependence of filament length of Anabaena spiroides Klebahn var. crassa Lemm. (1981)
    Springer
    Hydrobiologia 83 (1981), S. 419-423 
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    ISSN: 1573-5117
    Keywords: Anabaena spiroides Klebahn var.crassa Lemm. ; filament length ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Temperature dependence of filament length ofAnabaena spiroides Klebahn var.crassa Lemm. was examined for a strain isolated from Lake Kasumigaura, Japan. The length of the algal filaments is shown to have good correspondence with the thermal master reaction of cell multiplication.
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    Thermoregulatory behavior of juvenile cromileptes altivelis (serranidae), a tropical marine fish (1980)
    Springer
    Hydrobiologia 75 (1980), S. 281-282 
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    ISSN: 1573-5117
    Keywords: thermoregulation ; behavior ; temperature ; Cromileptes altivelis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ten juvenile Cromileptes altivelis were tested individually for 3-day periods in electronic shuttleboxes to measure their thermoregulatory behavior. The fish voluntarily occupied a 21–27°C span, out of a potentially available 0–50°C range. The mean final thermal preferendum was 24.5°C for all individuals. The thermoregulatory performance of this species is similar to that of cool temperate freshwater fishes.
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    The effect of temperature, darkness, starvation and various food types on growth, survival and reproduction of Helisoma duryi, Biomphalaria alexandrina and Bulinus truncatus (Gastropoda: Planorbidae) (1982)
    Springer
    Hydrobiologia 88 (1982), S. 265-275 
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    ISSN: 1573-5117
    Keywords: Biomphalaria ; Bulinus ; Helisoma ; schistosomiasis ; biological control ; temperature ; darkness ; starvation ; food
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Helisoma duryi has been proposed as a biological control agent in schistosomiasis due to its superiority in laboratory competition experiments with various species of the intermediate host snails. Therefore it was considered important to evaluate the response of this snail species and the intermediate host species, Biomphalaria alexandrina and Bulinus truncatus, to various physical, chemical and biological factors under laboratory conditions in order to obtain information on the similarities in the ecological niches of these species. The factors considered in the present paper are: temperature, darkness, starvation and food. All three species had optimal growth and egg laying at 26–28 °C. Only H. duryi survived for a longer period at 33°C and it was capable of starting egg laying at this temperature although the onset was delayed. However, low temperature (18°C) caused a relatively larger decrease in egg laying of H. duryi than in the other two species. Growth and egg laying was reduced for H. duryi and B. truncatus kept under darkness and B. alexandrina could not tolerate maintenance under darkness. A few days of starvation of juvenile snails had no effect on later growth and egg laying capacity of the survivors, although mortality in B. truncatus was increased. B. alexandrina had a lower tolerance to starvation than the other two species. Egg laying of snails fed only one of the three laboratory food types decreased for all three species in the order: Vov-vov (dog food in dry pellets), Tetramin (fish food) and lettuce. Combinations of lettuce and one or more proteinaceous food types gave optimal growth and egg laying for all three species.
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    Distribution of chironomids in the littoral zone of Lake Texoma, Oklahoma and Texas (1982)
    Springer
    Hydrobiologia 89 (1982), S. 177-188 
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    ISSN: 1573-5117
    Keywords: Chironomidae ; littoral ; reservoir ; salinity ; chlorides ; particulate organic matter ; temperature ; wind
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lake Texoma in southcentral Oklahoma was formed by the impoundment of the Washita and Red Rivers. The Red River is more highly saline than the Washita and creates a complex salinity gradient across the reservoir. Populations of chironomids were monitored with multiple-plate samplers in areas of high (34–113 mg l−1 Cl−), intermediate (35–60 mg l−1 Cl−) and low (4–27 mg l−1 Cl−) salinity during the spring and summer of 1978. Food availability, temperature, salinity and wind direction influenced the distribution of the 14 genera and at least 22 species of chironomids which colonized the multiple-plate samplers. Filter-feeders attained their highest densities in the river-arm stations where levels of particulate organic matter (POM) were high. Algal grazers attained their highest densities in the clear intermediate area where the plates of the samplers were covered with algal mats. Most of the genera believed to be feeding primarily on POM decreased in density as the temperature and density of Glyptotendipes sp. rose. Certain species were restricted to either the Red River arm or the Washita River arm and this is probably a reflection of different salinity tolerances.
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    Availability of dissolved oxygen in interstitial waters of a sandy creek (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 651-658 
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    ISSN: 1573-5117
    Keywords: stream ; sediment ; sand ; hyporheal ; oxygen ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dissolved oxygen, pH, conductivity and alkalinity of surface and subsurface interstitial waters were investigated at Mill Creek (a small, rural, predominantly sandy stream in east Texas). Dissolved oxygen concentration tended to decrease with sediment depth, while conductivity and alkalinity did not significantly change with substrate depth. Surface water pH was significantly higher than interstitial water (p = 0.05). Chemical analyses of subsurface water from a pre- to post-storm event showed a depression in dissolved oxygen concentration in moderate and deep interstitial waters, immediately following the return of stream base flow, with the deeper strata returning to pre-storm oxygen levels four days later. A thermal convective current mechanism is proposed which would serve to transport surface water downward into these deeper interstices.
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    Salinity and temperature tolerance of juvenileMesopodopsis orientalis: laboratory studies (1982)
    Springer
    Hydrobiologia 93 (1982), S. 23-30 
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    ISSN: 1573-5117
    Keywords: Mysidacea ; salinity tolerance ; temperature ; Mesopodopsis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Separate and combined effects of changes in salinity and water temperature on the survival of laboratory hatched juvenileMesopodsis orientalis were investifated. Full strength seawater (35‰) was not favorable to juvenile survival. Salinities down to 10% seawater were tolerated when subjected to sudden exposure, but salinity acclimation increased juvenile ability to tolerate even fresh water. Water temperatures tolerated by the animals ranged from 12°C to 33°C. Salinities of 30% to 60% seawater and water temperatures of 22°C to 28°C were most favorable to the juveniles. Experimental results were compared with field observations and a relationship between the salinity and temperature of seawater and abundance of juveniles in May to June, and November to January in Bombay coastal waters (west coast of India) was established. Seawater of reduced salinity was found to be a major factor for occurrence of juvenileM. orientalis in abundance.
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    Ammonia nitrogen and inorganic phosphorus excretion by the planktonic rotifers (1983)
    Springer
    Hydrobiologia 104 (1983), S. 231-236 
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    ISSN: 1573-5117
    Keywords: rotifers ; phosphorus ; nitrogen ; excretion ; temperature ; body weight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two series of experiments were carried out to determine the relation of the rate of phosphorus and nitrogen excretion by the planktonic rotifers to ambient temperature and individual body weights of these animals. The following formulas describing this relation were obtained: EP=0.0154 W−1.27 e0.096T EN=0.0879 W−1.01 e0.088 T, where EP and EN denote the rate of P and N excretion, respectively, in µg · mg dry wt−1 · h−1, W is body weight in µg dry weight, and T is temperature in °C.
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    Comparative studies on the relationship between temperature and duration of embryonic development of rotifers (1983)
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    Hydrobiologia 104 (1983), S. 237-246 
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    ISSN: 1573-5117
    Keywords: rotifers ; embryonic development time ; temperature ; ecological significance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The embryonic development times of four planktonic rotifers from Neusiedlersee (Austria) (Rhinoglena fertöensis, Brachionus calyciflorus, Keratella quadrata and Polyarthra dolichoptera) were determined at constant temperatures ranging from 0.6 °C to 10.5 °C. Development times decreased with increasing temperatures. The curvilinear relationship between temperature and development time was described by Bělehrádek's equation. Data on embryonic development times of rotifers are summarized and regression equations for the temperature-duration of development relationship are presented. Adaptation to temperature is discussed in the context of the thermal history of the various species and populations.
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    A laboratory study on the thermal tolerance of four southeastern stream insect species (Trichoptera, Ephemeroptera) (1981)
    Springer
    Hydrobiologia 79 (1981), S. 141-145 
    Details
    ISSN: 1573-5117
    Keywords: Thermal tolerance ; temperature ; benthic insects ; Trichoptera ; Ephemeroptera
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The acute thermal tolerances of four southeastern stream insect species, Ephemerella invaria (Walker), Stenonema ithaca (Clemens and Leonard), Symphitopsyche morosa (Hagun), and Brachycentrus lateralis (Say) were determined using an artificial stream enclosure. All species were acclimated at 10°C for 72 hours prior to instantaneous immersion into heated water for 96 hours. Percent mortality was recorded and the temperature at which 50% mortality occurred determined (LT5o). Data were subjected to standard statistical analysis. Thermal tolerance values were compared between species tested and to results from previous investigations using similar methodologies. The evolution and life histories of these species were also discussed in relation to their thermal tolerance values.
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    URL: http://dx.doi.org/10.1007/BF00006121
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    Swimming performance and metabolic rate of three tropical fishes in relation to temperature (1981)
    Springer
    Hydrobiologia 83 (1981), S. 245-254 
    Details
    ISSN: 1573-5117
    Keywords: active metabolism ; basal metabolism ; metabolic compensation ; swimming performance ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Oxygen consumption was measured for three tropical fishes,Exodon paradoxus, Leporinus fasciatus andLabeo erythrurus in relation to swimming speed and temperature. For each species the logarithm of oxygen consumption (mg 02 · g−1 · h−1) increased linearly with relative swimming speed (1 · s−1) with the value of the regression coefficients varying inversely with temperature. Active metabolism and critical swimming speed ofE. paradoxus andL. fasciatus increased with temperature to a maximum at 30 and 35° C respectively. Basal metabolic rates ofE. paradoxus andL. fasciatus increased with temperature. Metabolic rates and critical swimming speed of the three fishes studied were consistent with values for polar, temperate and other tropical species over their respective thermal ranges of tolerance. Tropical fishes have lowered their metabolism and swimming performance from that expected for many temperate species at the same temperature.
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    URL: http://dx.doi.org/10.1007/BF00008273
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    Thermoregulatory behavior of the triggerfish Balistes fuscus in an electronic shuttlebox (1981)
    Springer
    Hydrobiologia 83 (1981), S. 255-256 
    Details
    ISSN: 1573-5117
    Keywords: thermoregulation ; behavior ; temperature ; triggerfish ; Balistes fuscus ; tropical reef ; Ichthyotron
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ten blue triggerfish,Balistes fuscus, were tested individually for 3 days each in Ichthyotron electronic shuttleboxes to measure their thermoregulatory behavior. The modal thermal preferendum, a species-specific measure of temperature preference which is independent of prior thermal acclimation, was 25 °C. The triggerfish voluntarily occupied a 16–27 °C range of temperature, out of a potentially available range of 0–50 °C. There was no significant difference in preferred temperature between night and day, indicating lack of a thermoregulatory rhythm in this species. The preferred temperature range of this tropical marine reef species is similar to that of cool temperate freshwater and marine fishes; many warm temperate species prefer higher temperatures.
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    Delayed gametogenesis and spawning of sea bass (Dicentrarchus labrax L.) kept under different photoperiod and temperature regimes (1986)
    Springer
    Fish physiology and biochemistry 2 (1986), S. 53-63 
    Details
    ISSN: 1573-5168
    Keywords: daylength ; temperature ; LHRHa ; reproduction ; delayed spawning ; intraovarian oocytes ; maturity index ; sea bass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The present work investigates the importance of day length and temperature in the control of reproduction of sea bass, as well as the effectiveness of LHRHa and HCG in inducing spawning out of season in this species. A controlled regime was produced and seasonal cycles with high components of temperature and photoperiod were extended from the summer solstice for at least 6 months, followed by a short photoperiod regime for 3 months before a new increase in these components. Natural spawning in the control fish occurred more frequently in mid February, although it was also observed in January and early March. Temperature manipulation delayed the spawning one month with respect to the controls, although some of the animals entered into gonadal regression. Photoperiodic manipulation delayed maturation for three months with respect to controls but it was necessary to perform hormonal induction of spawning. Although LHRHa and HCG were both applied, only intraperitoneal injections of LHRHa were effective in inducing spawning of sea bass out of season when the temperatures were 17°C. Dephasing between the annual changes in photoperiod in relation to the coordination of the different events of the sexual cycle of sea bass is considered.
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    URL: http://dx.doi.org/10.1007/BF02264073
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    Water balance in developing eggs of the codGadus morhua L. (1987)
    Springer
    Fish physiology and biochemistry 3 (1987), S. 17-24 
    Details
    ISSN: 1573-5168
    Keywords: osmoregulation ; temperature ; embryonic development ; teleost ; eggs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Measurements of yolk osmolality from the embryo of codGadus morhua L. revealed significant variations in the hyposmolality during the embryonic development. The embryo proved to have an extremely low water permeability, protecting it from dehydration in the hyperosmotic seawater. The effect of temperature on the water permeability is high, expressed by an exceptionally high activation energy for water transfer. The agreement between embryonic volume decrease and diffusion permeability during the first 8–10 days after fertilization indicates that no water uptake mechanism is present at this time, thus leaving the embryo fully dependent on internal water stores. The cod egg is buoyant in seawater throughout development. The mechanism for providing hydrostatic lift is the large volume of diluted tissue water located in the yolk and subdermal spaces.
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    URL: http://dx.doi.org/10.1007/BF02183990
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    Secretion of hatching enzyme and its proteolytic activity in coregoninae (Coregonus albula L andC. lavaretus L) embryos (1987)
    Springer
    Fish physiology and biochemistry 4 (1987), S. 57-62 
    Details
    ISSN: 1573-5168
    Keywords: chorion dissolution ; chorionasc activity ; chorionase secretion ; Coregoninae ; hatching ; pH ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract After the electrial stimulation Coregoninae embryos secreted the hatching enzyme (chorionase) within 0.1–0.5 h, and the dissolution of their chorions lasted 1.2–2.0 h, depending on embryo's developmental stage (DS 13 or DS 14) and water temperature (5.2 or 9.6–9.8°C). Crude chorionase (hatching liquid) ofCoregonus albula andC. lavaretus was collected in large quantities by means of the electric stimulation of eggs. In both species the temperature optimum of proteolytic activity of the crude chorionasc was 30°C; the activity was lost at temperatures 〈 3-2°C and 〉 35–40°C. The maximal proteolytic activity was observed at pH 8.5; a rapid decrease in enzyme activity was evident at pH 〈 7.0, and the activity was zero at pH 6. The temperature-activity curve of chorionase may reflect the adaptation of Coregoninae to hatching immediately after the ice cover recedes from lakes, whereas the rapid decrease of enzyme activity at pH 7 -pH 6 can affect adversely the process of hatching in acidified lakes.
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    URL: http://dx.doi.org/10.1007/BF02044314
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    Oxygen consumption and responses to hypoxia of ammocoetes of the southern hemisphere lampreyGeotria australis (1987)
    Springer
    Fish physiology and biochemistry 4 (1987), S. 63-72 
    Details
    ISSN: 1573-5168
    Keywords: oxygen consumption ; body weight ; temperature ; hypoxia ; ventilatory frequency ; ammocoetes ; metamorphosis ; lampreys ; Geotria australis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The standard rate of oxygen consumption of ammocoetes (larvae) ofGeotria australis with a mean weight of c. 0.5 g was 9.6, 31.4 and 59.4μl g−1 h−1 at 4.5, 15.5 and 25.0°C respectively, which gives an overall Q10 of 2.4. The regression coefficient for the logarithmic relationship between oxygen consumption and body weight at 15.5°C was 0.704. The ammocoetes ofG. australis have a much lower rate of oxygen consumption at 15.5 and 25.0°C than those of holarctic lampreys. This presumably reflects the lower oxygen delivery pressure to their tissues and helps account for their slow growth rate. At 15.5°C, ammocoetes ofG. australis emerged from the substrate at 21–25 mm Hg and, unlike those of the Northern HemisphereIchthyomyzon greeleyi, died at 14–17 mm Hg. Thus, despite having a thinner water/blood barrier in the gills and blood with a higher oxygen affinity and capacity than holarctic ammocoetes, the larvae ofG. australis cannot survive very low dissolved oxygen tensions. This is apparently related to an inability of larvalG. australis to meet the high oxygen requirements of the respiratory pump at these oxygen tensions. During metamorphosis, oxygen consumption at 15.5°C rose from approximately 27μl g−1 h−1 at the beginning of transformation to 33.2μl g−1 h−1 by Stage 3 and then rapidly to 66μl g−1 h−1 at Stage 6. It remained near this level in Stage 7 and the downstream migrant.
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    Oxidation of micronized elemental sulphur in soil (1989)
    Springer
    Plant and soil 116 (1989), S. 69-76 
    Details
    ISSN: 1573-5036
    Keywords: oxidation ; soil ; sulphur ; temperature ; tetrathionate ; thiosulphate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The rate of oxidation of micronized elemental sulphur in three soils was measured over a range of temperatures between 2 and 20°C. Temperature had a marked effect with a Q10 (temperature coefficient) between 1.9–3.1. The period for 50% oxidation varied between 6–10 days at 20°C to between 36–42 days at 2°C. All the oxidation curves showed an initial lag. At 20°C the oxidation rate was four times that of flowers of sulphur and was related to the smaller particle size. Additives (wetting and dispersing agents) in the commercial micronized sulphur preparation used (‘Thiovit’) were inhibitory at high concentrations but stimulatory at low concentrations. The significance to field conditions is discussed.
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    Effects of environmental conditions on the fixation and transfer of nitrogen from alfalfa to associated timothy (1988)
    Springer
    Plant and soil 107 (1988), S. 25-30 
    Details
    ISSN: 1573-5036
    Keywords: alfalfa ; day length ; light intensity ; nitrogen fixation ; nitrogen transfer ; temperature ; timothy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Nitrogen fixation (NF) by alfalfa and nitrogen transfer (NT) from alfalfa to associated timothy was studied under different environmental conditions in controlled growth chambers, using the15N dilution technique. Evidence was obtained of NT from alfalfa to the associated timothy. Conditions that favored NF by alfalfa resulted in an increase in its NT. Of 3 different temperature regimes (25/20, 16/14, and 12/9°C day/night), 16–25/14–20°C was the best range for NF by alfalfa and resulted in the greatest NT. High light intensity (550 uE.m−2.sec−1) and long days (16–20 h) also caused increased NF by alfalfa and benefitting timothy more than in a regime of low light intensity (by shading 50% or 75%) or short days (12/12 or 16/8 h day/night). When the inoculated (Rhizobium meliloti) root systems of plants were kept free from other microorganisms (axenic condition) to minimize possible decomposition of dead tissues, lower NT from alfalfa was observed, especially at later cuts, compared to non-axenic plants. This suggests that both direct excretion and decomposition of dead alfalfa tissues are sources of N benefit from alfalfa to associated timothy.
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    URL: http://dx.doi.org/10.1007/BF02371540
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    In vitro propagation of Vicia faba L. by micro-cutting and multiple shoot induction (1989)
    Springer
    Plant cell, tissue and organ culture 18 (1989), S. 167-179 
    Details
    ISSN: 1573-5044
    Keywords: Vicia faba L. ; in vitro propagation ; temperature ; nitrogen ; activated charcoal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The influences of nitrogen sources, culture temperature and activated charcoal supplements were studied in relation to the rooting ability of V. faba cuttings. The interaction of these factors led to quantitative and qualitative modifications of the culture responses. Low temperatures (14–18°C) were suitable for in vitro culture, limiting the formation of phenolics in plant material and making activated charcoal supplement unnecessary. Nitrogen supplements contributed in modifying the different plant responses, in accordance with temperature. Multiple shoot formation was obtained from the cotyledonary node and from the stem nodes cultivated in the presence of 6-benzylaminopurine (BAP). BAP at 4 mg l-1 was the most effective concentration in promoting high rates of shoot development. The original position of stem nodes was found to determine the explant response to plant growth regulator treatments, possibly due to the effect of residual apical dominance.
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    Environmental effects on feed utilization (1986)
    Springer
    Fish physiology and biochemistry 2 (1986), S. 131-140 
    Details
    ISSN: 1573-5168
    Keywords: fish ; environmental influences ; salinity ; oxygen ; temperature ; growth ; protein synthesis ; feed utilization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Both external and internal factors affect the response of fish to variations in dietary quantity and quality. An attempt is made to review major, recent studies on the series of intermediate steps (intake, digestion, metabolism, excretion and retention) involved in the global response of fish to environmental changes. Among these external factors, greater attention is however devoted to those that are the most important natural effectors within the aquatic environment: temperature, ambient oxygen and salinity. The changes brought about by a change in temperature at different levels of nutrient utilization have been studied to a great extent in the recent past. As temperature affects in the first instance, the voluntary food intake, a discussion on current nutrient requirement data should preferably be dealt with in absolute terms. While critical levels of oxygen below which growth is hindered are sufficiently defined for many species, precise data on the direct effects of oxygen deficiency on nutrient utilization are still fragmentory. With regard to salinity, a distinction between stenohaline and euryhaline species and a knowledge of the physiological mechanisms corresponding to their life cycles are required before attempting comparative analyses. Within euryhaline species, best performances are noted at salinities isotonic to the internal medium. Despite accumulating evidence on the effects of cyclical phenomena, the chronobiological approach to fish culture remains practically unexplored.
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    Influence of pH and temperature on force development and shortening velocity in skinned muscle fibres from fish (1988)
    Springer
    Fish physiology and biochemistry 5 (1988), S. 257-262 
    Details
    ISSN: 1573-5168
    Keywords: fish ; skinned muscle fibres ; contractile properties ; pH ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Three species of fish were studied: Atlantic cod (Gadus morhua), sculpin (Myoxocephalus scorpius) (from the North Sea, temperature 2 to 12°C) andNotothenia neglecta (from Antarctica, temperature −2 to +2°C). Single fast muscle fibres were isolated from anterior myotomes and skinned with detergent in order to directly determine the effects of pH and temperature on force production and shortening velocity. In all species maximum force production (Po) was independent of pH over the range 7.3–8.0. Decreasing the pH from 7.3 to 6.6 reduced maximum force by 28% in fibres fromG. morhua andN. neglecta but had no effect on fibres fromM. scorpius. The depression in maximum force with acidosis was accompanied by a proportional decrease in stiffness and an increase in the rate of force recovery after stretch. Unloaded contraction velocity of cod fibres (Vmax) showed a pH optimum at around pH 7.6 decreasing by 31% at pH 6.6. Vmax of fibres from the other species was independent of pH over the range 6.6–8.0. The effects of pH on Po and Vmax were similar at 0 and 10°C. Thus for maximally activated fibres both force and contraction velocity are independent of temperature induced changes in pH. In some species acidosis depresses contractility and is likely to be a contributory factor to muscle fatigue.
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    Interacting effects of diet and environmental temperature on biochemical parameters in the liver ofLeuciscus idus melanotus (Cyprinidae: Teleostei) (1988)
    Springer
    Fish physiology and biochemistry 5 (1988), S. 9-19 
    Details
    ISSN: 1573-5168
    Keywords: ide ; adaptation ; nutrition ; temperature ; growth ; liver ; nucleic acids ; storage products
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract One year old golden ide (Leuciscus idus melanotus) were starved for 2 weeks at 20°C (time zero) and then they were fed either freeze-dried mosquito larvae (natural diet) or a commercial fish chow (artificial diet) at an ambient temperature of 14°C and 20°C, respectively. Growth parameters and biochemical data in the liver were measured at time zero and after 3 and 7 weeks of specific regimen. If compared to natural food, the artificial diet caused transient increase in anabolic activity of the liver, but prevented long-lasting hepatocyte proliferation (increase of total liver DNA). After 3 weeks on artificial diet, the body weight was significantly higher and the liver mass doubled compared to ide kept on the natural regimen; tissue DNA content indicated that the hepatocyte volume increased mainly by increased protein content and corresponding uptake of water; lipid and glycogen contents were increased by a factor of 3–6, and the RNA∶DNA ratio was increased accordingly. The growth of the ide, as reflected by the condition factor and hepatosomatic index (HSI), was virtually stopped when the artificial regimen was maintained for 7 weeks, whereas on natural food the condition factor was increased and liver weight and DNA were doubled. Growth of the fish maintained at 14°C was significantly lower than that of fish maintained at 20°C, though the total liver DNA was still increased on the natural regimen during the experiment. Less lipid was stored by fish maintained at 14°C, whereas protein and glycogen deposits were enlarged, if compared to fish maintained at 20°C. The specific activity of cytochrome oxidase in liver mitochondria and of NADPH cytochrome c reductase in the microsomal fraction were found independent of diet and ambient temperature. Oxidative capacity of hepatocytes (mitochondrial protein/mg DNA) remained unchanged, and microsomal protein/cell appeared reduced in response to the artificial food. However, reduction of cell number on this diet resulted in less total mitochondrial and microsomal protein in the organ. Golden ide liver is found to be a sensitive experimental model to characterize the mutual influence of diet and temperature on fish; the results are discussed with regard to the usage of golden ide as test fish for water pollution.
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    Diurnal variations in hypothalamic monoamine levels in the teleostChanna punctatus (bloch) in response to melatonin under two photothermal conditions (1988)
    Springer
    Fish physiology and biochemistry 5 (1988), S. 187-190 
    Details
    ISSN: 1573-5168
    Keywords: melatonin ; photoperiod ; temperature ; diurnal variation ; dopamine ; noradrenaline ; 5-hydroxytryptamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hypothalamic dopamine (DA), noradrenaline (NA) and 5-hydroxytryptamine (5-HT) levels exhibited marked day-night variations under ambient photoperiod and temperature (12L∶12D; 17±1°C) with peak values at mid-light phase. The 16L∶8D; 22±1°C treatment reversed the diurnal rhythm of 5-HT, but not that of DA and NA. However, there was an overall increase in the levels of the catecholamines on exposure to the long photoperiod and high temperature. The administration of melatonin in the fish held on 16L∶8D; 22±1°C regime restored the 5-HT rhythm to that of the 12L∶12D; 17±1°C control group, but with elevated mid-photophase value. However, there was no effect of the indole treatment on the 5-HT rhythm under the 12L∶12D; 17±1°C regime. Melatonin causes a significant reduction of NA level in both the groups, while DA level did not change in either group.
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    The adaptation of biological membranes to temperature and pressure: Fish from the deep and cold (1989)
    Springer
    Journal of bioenergetics and biomembranes 21 (1989), S. 115-135 
    Details
    ISSN: 1573-6881
    Keywords: Membrane fluidity ; fish membranes ; homeoviscous adaptation ; temperature ; hydrostatic pressure ; acclimation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Physics
    Notes: Abstract The homoeostatic regulation of bilayer order is a property of functional importance. Arguably, it is best studied in those organisms which experience and must overcome disturbances in bilayer order which may be imposed by variations in temperature of hydrostatic pressure. This article reviews our recent work on the adaptations of order in brain membranes of those fish which acclimate to seasonal changes in temperature or which have evolved in extreme thermal or abyssal habitats. The effects of temperature and pressure upon hydrocarbon order and phase state are reviewed to indicate the magnitude of the disturbances experienced by animals in their environments over the seasonal or evolutionary timescale. Acclimation of fish to altered temperature leads to a partial correction of order, while comparison of fish from extreme cold environments with those from temperate or tropical waters reveals a more complete adaptation. Fish from the deep sea also display adaptations of bilayer order which largely overcome the ordering effects of pressure.
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    Effects of weather during leaf development on photosynthetic characteristics of soybean leaves (1985)
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    Photosynthesis research 6 (1985), S. 215-220 
    Details
    ISSN: 1573-5079
    Keywords: acclimation ; leaf expansion ; light ; photosynthesis ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Net photosynthetic rates and mesophyll conductances at 25 °C at light saturation and air levels of carbon dioxide and oxygen were measured on recently fully expanded leaflets of second trifoliolate leaves of soybeans (Glycine max cv. Kent). Plants were grown outdoors in pots at Beltsville, Maryland with 14 planting times from May through August, 1983. Air temperature and humidity, and photosynthetically active radiation (PAR) were measured for the expansion periods of the second trifoliolate leaves. Rates of net photosynthesis ranged from 24 to 33 μmol m−2 s−1, and mesophyll conductances from 0.24 to 0.35 cm s−1 for the different planting dates. Mean 24-h air temperatures ranged from 20.6 to 29.0 °C, and mean daily PAR ranged from 29.4 to 58.4 mol m−2 d−1 for the leaf expansion periods. There was a positive relationship between photosynthetic characteristics and PAR during leaf expansion, and a negative relationship between photosynthetic characteristics and leaf expansion rates, with 96% of the variation in photosynthetic characteristics accounted for by these two variables. Leaf expansion rates were highly correlated with air temperature.
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    Regulation of photosynthetic CO2-pathway enzymes by light and other factors (1985)
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    Photosynthesis research 6 (1985), S. 247-259 
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    ISSN: 1573-5079
    Keywords: carbon dioxide ; CO2 fixation ; concentration ; irradiance ; photosynthetic enzymes ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The regulatory properties of enzymes of the pathway of CO2 fixation are discussed in relation to changes in regulatory parameters with changing light, CO2 and temperature.
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    URL: http://dx.doi.org/10.1007/BF00049281
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    The ecological significance of the relationship between temperature and duration of embryonic development in planktonic freshwater copepods (1983)
    Springer
    Hydrobiologia 100 (1983), S. 65-91 
    Details
    ISSN: 1573-5117
    Keywords: freshwater copepods ; embryonic development time ; temperature ; ecological significance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The embryonic development times of six planktonic freshwater copepods from Austrian waters (Eudiaptomus gracilis, Arctodiaptomus bacillifer, Arctodiaptomus spinosus, Mixodiaptomus kupelwieseri, Cyclops abyssorum, Mesocyclops leuckarti) were determined at constant temperatures ranging from 1.4°C to 27.3°C. In most experiments the hatching success was very high, low survival occurring only when experimental temperatures closely approached lower and upper lethal ranges. Development times usually decreased with increasing temperatures, retardation in development occurring close to the upper lethal range. The non-linear relationship of development time to temperature is most adequately described by Bělehrádek's equation, quadratic models using log-transformed data perform almost equally well. Data on embryonic development times of planktonic copepods are summarized and regression equations (Bělehrádek's equation) for the relationship between duration of development and temperature are presented. Adaptation to temperature and intra- and interspecific differences and similarities in embryonic development times are discussed in the context of geographical distribution and thermal history of various species and populations. The applicability of general curves relating temperature to duration of development is examined and some of the deficiencies in the data are discussed.
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    URL: http://dx.doi.org/10.1007/BF00027423
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    Dynamics of 6-methoxybenzoxazolinone in winter wheat (1986)
    Springer
    Journal of chemical ecology 12 (1986), S. 2011-2020 
    Details
    ISSN: 1573-1561
    Keywords: 6-Methoxybenzoxazolinone ; hydroxamic acids ; wheat ; photoperiod ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract 6-Methoxybenzoxazolinone (6-MBOA), a compound derivable from some freshly growing plants, is known to stimulate reproduction in some mammals and birds. Winter wheat was studied under controlled laboratory conditions to determine the effects of photoperiod and temperature on derivable 6-MBOA content. Longer photoperiods decrease the amount of derivable 6-MBOA per gram of fresh material in 4-day-old wheat seedlings. Higher temperatures also decrease the amount of derivable 6-MBOA in 4-day-old wheat. 6-MBOA content decreases as the plant ages. Comparisons of only the first centimeter above the seed produced the same age-related result. 6-MBOA is concentrated in the meristematic region with decreasing amounts found in higher portions of the plant. Roots from 9-day-old plants contain 6-MBOA. Unsprouted wheat seeds contain negligible amounts of 6-MBOA. These results demonstrate that environmental variables have a significant effect on derivable 6-MBOA levels, but that under all the regimes studied, 6-MBOA is present in freshly sprouted wheat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01041950
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  • 187
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    Growth analysis of corn and soybean response to allelopathic effects of weed residues at various temperatures and photosynthetic photon flux densities (1983)
    Springer
    Journal of chemical ecology 9 (1983), S. 1263-1280 
    Details
    ISSN: 1573-1561
    Keywords: Amaranthus retroflexus ; Setaria glauca ; allelochemicals ; temperature ; light condition ; Zea mays ; corn ; glycine max ; soybeans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The effects of redroot pigweed (Amaranthus retroflexus L.) and yellow foxtail [Setariaglauca (L.) Beauv.] residues on corn (Zea mays L.) and soybeans [Glycine max (L.) Merr.] were evaluated at various temperatures and photosynthetic photon flux densities (PPFD) in a Biotron. Mathematical growth analysis techniques were used for the evaluation. Redroot pigweed markedly reduced leaf area duration (LAD), leaf weight ratio (LWR), and total dry matter production in both crops. Yellow foxtail residue inhibited total dry matter production in corn and soybeans 20 and 30 days after planting (DAP). It also reduced growth rate (GR) and LAD in corn and biomass increment (Δ W) in soybeans. Biomass increment was more closely correlated to LAD than net assimilation rate (NAR) in soybeans, whereas in corn NAR contributed more to Δ W than LAD. The 30/20 ° C temperature with a PPFD of 380 μE/m2/sec produced a larger Δ W with a greater NAR and larger LAD in corn, resulting in maximum dry matter accumulation than 20/10 ° C and other levels of PPFD. Under similar conditions, soybeans showed little or no response to the changes. The results demonstrate the allelopathic effects of weed residues on growth and dry matter production, affecting LAD, LWR, and GR. The results also show that environmental temperature and PPFD may alter the allelopathic effects of weeds on crops. The possible interference with photosynthesis and the partitioning of biomass into leaf component relative to the total biomass produced by the plant may be the inhibitory effects of allelochemicals present in redroot pigweed and yellow foxtail residues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00982228
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  • 188
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    Temperature dependence of liquid epoxy resin impregnation through polyester non-woven fabric (1983)
    Springer
    Colloid & polymer science 261 (1983), S. 834-845 
    Details
    ISSN: 1435-1536
    Keywords: Impregnation ; capillary ; liquid ; fabric ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The temperature dependence of liquid epoxy resin impregnation under atmospheric pressure was measured under the condition that the impregnation was through polyester non-woven fabric sheets, sandwiched between two circular glass plates. It was expected that impregnation would take place to a small extent, because the pressure in the sheet increases to more than atmospheric pressure in the course of impregnation from the perimeter of the circular sheet toward its center, but the liquid resin impregnates to a great extent and impregnating velocity increases with a rise in temperature. This phenomenon can be analyzed by the Kozeny-Carman equation improved by the introduction of the theoretically calculated capillary force in the modeled fiber bed structure and a parameter to postulate gas solubility and diffusion into the liquid resin. An increase in the impregnating velocity with the temperature rise is caused by decrease in the resin viscosity, by increase of the capillary force pressure and by decrease in the gas pressure corrected by a parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01421437
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  • 189
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    Far infrared remote sounding of stratospheric temperature and trace gas distributions (1984)
    Springer
    Journal of atmospheric chemistry 2 (1984), S. 145-161 
    Details
    ISSN: 1573-0662
    Keywords: Stratosphere ; remote sensing ; trace gases ; temperature ; Far infrared ; remote sensing ; stratosphere ; Spectroscopy ; stratosphere
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The thermal emission spectrum of the Earth's stratosphere in the far infrared exhibits rotational transitions of a large number of trace constituents in addition to the magnetic dipole lines of molecular oxygen. Stratospheric lines that have been identified in the far infrared spectrum include H2O, O3, HNO3, N2O, CO, HCl, HF, HCN and OH. This paper discusses the potential usefulness of far infrared thermal emission measurements for simultaneous retrieval of temperature and constituent distributions. A description of the high-resolution Michelson interferometer currently employed for balloon-borne far infrared stratospheric studies is given, along with a summary of the mode of limbscan observations and an example of an observed spectrum. Numerical results based on synthetic limb radiance data for model atmospheres are presented. Formal inversion techniques with a radiative transfer model based on line-by-line transmittance calculations are employed. Temperature profiles are retrieved from synthetic spectra by an inversion of the O2 magnetic dipole lines. Vertical trace gas mixing ratio profiles are determined from an analysis of the corresponding spectral emission features. Numerical results based on synthetic limb radiance data are presented in order to assess the retrieval accuracies of the temperature profiles and the vertical mixing ratio profiles of O3, HCl, and OH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00114128
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  • 190
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    The NO2-O3 system at sub-ppm concentrations: Influence of temperature and relative humidity (1985)
    Springer
    Journal of atmospheric chemistry 2 (1985), S. 387-403 
    Details
    ISSN: 1573-0662
    Keywords: Night-time NO2 oxidation ; nitrate radical ; nitrogen pentoxide ; wall scavening ; stoichiometry ; kinetic study ; temperature ; relative humidity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The stoichiometry and kinetics of the reaction of NO2 with O3 at sub-ppm concentration level have been investigated as a function of temperature and relative humidity. The experiments were performed in a continuous flow reactor using chemiluminescent and wet chemical methods of analysis. The rate constant found can be described by the Arrhenius expression: % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaaiikaiaaik% dacaGGUaGaaGyoaiaaiEdacqGHXcqScaaIWaGaaiOlaiaaigdacaaI% 0aGaaiykaiabgEna0kaaigdacaaIWaWaaWbaaSqabeaacqGHsislca% aIXaGaaG4maaaakiaabwgacaqG4bGaaeiCaiaacIcadaWcgaqaaiaa% cIcacqGHsislcaaIYaGaaGOnaiaaikdacaaIWaGaeyySaeRaaGyoai% aaicdacaGGPaaabaGaamivaiaacMcacaqGGaGaae4yaiaab2gadaah% aaWcbeqaaiaabodaaaGccaqGGaWaaSGbaeaacaqGTbGaae4BaiaabY% gacaqGLbGaae4yaiaabwhacaqGSbGaaeyzamaaCaaaleqabaGaaeyl% aiaabgdaaaaakeaacaqGZbWaaWbaaSqabeaacaqGTaGaaeymaaaaaa% aaaaaa!62A3!\[(2.97 \pm 0.14) \times 10^{ - 13} {\text{exp}}({{( - 2620 \pm 90)} \mathord{\left/ {\vphantom {{( - 2620 \pm 90)} {T){\text{ cm}}^{\text{3}} {\text{ }}{{{\text{molecule}}^{{\text{ - 1}}} } \mathord{\left/ {\vphantom {{{\text{molecule}}^{{\text{ - 1}}} } {{\text{s}}^{{\text{ - 1}}} }}} \right. \kern-\nulldelimiterspace} {{\text{s}}^{{\text{ - 1}}} }}}}} \right. \kern-\nulldelimiterspace} {T){\text{ cm}}^{\text{3}} {\text{ }}{{{\text{molecule}}^{{\text{ - 1}}} } \mathord{\left/ {\vphantom {{{\text{molecule}}^{{\text{ - 1}}} } {{\text{s}}^{{\text{ - 1}}} }}} \right. \kern-\nulldelimiterspace} {{\text{s}}^{{\text{ - 1}}} }}}}\] and are independent of the relative humidity. As commonly encountered in previous studies a lower-than-two reaction stoichiometry is observed. Heterogeneous reactions occurring at the reactor wall seem to be essential in the reaction mechanism. The NO3 wall conversion to NO2 and the N2O5 wall scavenging in the presence of H2O are suggested to account for the observed stoichiometric factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00130750
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  • 191
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    Measurement of thermal stress in graphite intercalated with bromine (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 279-282 
    Details
    ISSN: 1572-9567
    Keywords: bromine ; exfoliation ; graphite ; intercalation ; phase transition ; stress ; temperature ; thermal stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal stress of graphite intercalated with bromine was found to increase from zero at about 100°C to about 1.3 MPa at 200°C. The effect was reversible with hysteresis. The thermal stress increase had a sharp temperature dependence due to its association with the exfoliation phase transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00504248
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  • 192
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    Endogenous inhibitors and seasonal changes in abscisic acid in Dioscorea floribunda Mart. & Gal. (1989)
    Springer
    Plant growth regulation 8 (1989), S. 225-232 
    Details
    ISSN: 1573-5087
    Keywords: Abscisic acid ; dormancy ; batatasin-I ; phthalic acid ; temperature ; Dioscorea floribunda
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In the tubers of medicinal yam (Dioscorea floribunda Mart. & Gal.) abscisic acid (ABA) content was high in all the parts during the dormant condition in the winter, but it decreased to a very low level in the actively growing plants. ABA content of the entire tuber was negatively correlated with temperature and photoperiod. Growth inhibitors including batatasin-I and phthalic acid were identified in the dormant tuber.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025392
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  • 193
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    The distribution, life cycle and production of Leptophlebia vespertina (L.) (Ephemeroptera) in a lowland lake (1986)
    Springer
    Hydrobiologia 133 (1986), S. 3-19 
    Details
    ISSN: 1573-5117
    Keywords: macroinvertebrates ; life cycle ; distribution ; production ; predation ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Oak Mere, the water body studied, is a moderately productive base-poor lowland lake. It has zones of submerged marginal vegetation growing on sand at the south-west end and on peat at the north-east end. The distributions of L. vespertina and other macroinvertebrates are described in relation to these two distinct areas. Laboratory experiments on behaviour and survival are described in an attempt to explain the patterns of distribution. The seasonal distribution, variations in population density, spatial distribution variance in relation to mean density, life cycle, length-weight relationship, growth and biomass of L. vespertina are then described during two years at the sandy south-west end. The data are used to estimate annual production. Distribution, life cycle, growth and production are compared with populations in water bodies of lower conductivity in the British Isles and Scandinavia.
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    URL: http://dx.doi.org/10.1007/BF00010797
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  • 194
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    Rapid responses to stress in Eurytemora affinis (1988)
    Springer
    Hydrobiologia 167-168 (1988), S. 197-200 
    Details
    ISSN: 1573-5117
    Keywords: adaptation ; temperature ; stress proteins ; membrane lipids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract E. affinis can adjust to temperature stress in a matter of hours. Adaptation is greater in a varying temperature than in a constant temperature, consistent with the estuarine habitat of this calanoid. The species has the capacity to adjust both in the short-term as individuals and also genetically over a number of generations. The adjustments have been examined at several levels of organization. In whole copepods the time an individual becomes comatose when exposed to a 32 °C temperature and increasing by 1/2 °C at 5 min. intervals, has been used as a repeatable assay and gives a good prediction of survival at 30 °C, the ecological limit of the species in Chesapeake bay, USA. At the molecular and cellular levels, two adaptive mechanisms which have been observed in temperature stressed copepods are the synthesis of novel proteins and phase changes in plasma membrane lipids. Both of these mechanisms have potential for further understanding the adaptation of Eurytemora to variable temperatures. They may also have application as indicators of sublethal stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026305
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    Influence of temperature and food concentration on body size, weight and lipid content of two Calanoid copepod species (1988)
    Springer
    Hydrobiologia 167-168 (1988), S. 201-210 
    Details
    ISSN: 1573-5117
    Keywords: copepods ; temperature ; food ; size ; weight ; lipid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two species of Copepoda Temora longicornis (Müller) and Pseudocalanus elongatus (Boeck) were cultured continuously in the laboratory. Four and three generations, respectively, were raised at 16 different combinations of temperature and food concentration. Prosome length and ash-free dry weight were measured in the adult stage and in Pseudocalanus also in copepodite stage I, and the relation between length and weight was established. In Pseudocalanus also the relative amount of lipid was estimated. Prosome length and length-specific body weight (condition factor) were positively correlated with food concentration. Lipid content in Pseudocalanus was also strongly affected by the concentration of food. Prosome length was negatively correlated with temperature. However, length-specific body weight in Temora was positively correlated with temperature. Therefore, at higher temperature Temora was smaller, but heavier per unit body length. In Pseudocalanus a similar but less significant influence of temperature on length-specific weight was found; lipid content was not significantly influenced by the temperature. Females of Temora had larger length-specific weights than males. In Pseudocalanus the opposite was found, coinciding with a higher lipid content in males than in females. It is discussed that at natural concentrations of phytoplankton body size and weight of copepods are reduced in the North Sea during the major part of the growing-season.
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    URL: http://dx.doi.org/10.1007/BF00026306
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    Effects of irradiance and temperature on photosynthesis in C3, C4 and C3/C4 Panicum species (1986)
    Springer
    Photosynthesis research 10 (1986), S. 101-112 
    Details
    ISSN: 1573-5079
    Keywords: light ; Panicum species ; C3 ; C4 ; C3/C4 ; photosynthesis ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Species in the Laxa and Grandia groups of the genus Panicum are adapted to low, wet areas of tropical and subtropical America. Panicum milioides is a species with C3 photosynthesis and low apparent photorespiration and has been classified as a C3/C4 intermediate. Other species in the Laxa group are C3 with normal photorespiration. Panicum prionitis is a C4 species in the Grandia group. Since P. milioides has some leaf characteristics intermediate to C3 and C4 species, its photosynthetic response to irradiance and temperature was compared to the closely related C3 species, P. laxum and P. boliviense and to P. prionitis. The response of apparent photosynthesis to irradiance and temperature was similar to that of P. laxum and P. boliviense, with saturation at a photosynthetic photo flux density of about 1 mmol m-2 s-1 at 30°C and temperature optimum near 30°C. In contrast, P. prionitis showed no light saturation up to 2 mmol m-2 s-1 and an optimum temperature near 40°C. P. milioides exhibited low CO2 loss into CO2-free air in the light and this loss was nearly insensitive to temperature. Loss of CO2 in the light in the C3 species, P. laxum and P. boliviense, was several-fold higher than in P. milioides and increased 2- to 5-fold with increases in temperature from 10 to 40°C. The level of dark respiration and its response to temperature were similar in all four Panicum species examined. It is concluded that the low apparent photorespiration in P. milioides does not influence its response of apparent photosynthesis to irradiance and temperature in comparison to closely related C3 Panicum species.
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    URL: http://dx.doi.org/10.1007/BF00024189
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    Effects of temperature and photosynthetic inhibitors on light activation of C4-phosphoenolpyruvate carboxylase (1988)
    Springer
    Photosynthesis research 16 (1988), S. 233-242 
    Details
    ISSN: 1573-5079
    Keywords: light activation ; PEPCase ; photosynthetic inhibitors ; Setaria verticillata (L.) Beauv. ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phosphoenolpyruvate carboxylase from leaves of the C4 plant Setaria verticillata (L.) Beauv. is activated by light; day levels of activity are reached after 30 minutes of illumination. Photoactivation is prevented by inhibitors of photosynthetic electron flow or of photophosphorylation and by D,L-glyceraldehyde, which inhibits the reductive pentose phosphate pathway. Although the extractable activity in the dark is not affected by temperature the photoactivation is prevented when both illumination and extraction are done under low temperature (5 C). High temperature (30 C) during either illumination or extraction is needed for activation. Once the enzyme is photoactivated at 30 C, a transfer of the leaves to 5 C does not abolish the extra activity. The results suggest that both unimpaired electron flow and photophosphorylation are prerequisites for the activation of phosphoenolpyruvate carboxylase. Low temperature apparently suppresses either the transport to the cytoplasm of a photosynthetic intermediate or the activating reaction itself. The inclusion of phosphoenolpyruvate in the extraction medium increases the night activity. On the basis of the available information, it is suggested that phosphoenolpyruvate could be the activator in vivo. In that case, the activation of phosphoenolpyruvate carboxylase would depend on internal CO2 level and prior photoactivation of both pyruvate, orthophosphate, dikinase and NADP malate dehydrogenase.
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    URL: http://dx.doi.org/10.1007/BF00028842
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    Effects of day and night temperature and temperature variation on photosynthetic characteristics (1985)
    Springer
    Photosynthesis research 6 (1985), S. 175-181 
    Details
    ISSN: 1573-5079
    Keywords: acclimation ; photosynthesis ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Net photosynthetic rates and mesophyll conductances were measured under standardized conditions for leaves of two C3 and one C4 annual species grown at temperatures of 20 to 32°C. Plants were grown with varying day and night temperatures, and also at constant temperatures equal to all the day and night temperatures used. Plants were grown with 8, 12, and 16 hours of light per day. This design allowed determination of whether photosynthetic characteristics were best correlated with day, night, mean, or time-weighted mean temperatures, The results showed that for Glycine max (L.) Merr. (C3) night temperature was most important in determining photosynthetic characteristics, while in Helianthus annuus L. (C3) and Amaranthus hypochondriacus L. (C4) the time-weighted mean temperature was most important. The results for all species were consistent with the hypothesis that development of photosynthetic characteristics is related to a balance between the rate of leaf expansion and the rate of photosynthesis under the growth conditions.
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    URL: http://dx.doi.org/10.1007/BF00032791
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  • 199
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    Interacting effects of light, temperature, and nutrients on C-14 uptake of oscillatoria rubescens de candolle (1980)
    Springer
    Hydrobiologia 70 (1980), S. 51-56 
    Details
    ISSN: 1573-5117
    Keywords: Oscillatoria rubescens D.C. ; C14O2 uptake ; phytoplankton photosynthesis ; light ; temperature ; nutrient interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The rate of C14O2 uptake in a bacterized isolate of Oscillatoria rubescens indicates that within the ranges studied temperature caused the greatest variation followed by light intensity and nutrient concentration. The variation within interaction effects of light, temperature, and nutrients was higher than that within any other combination of interactions. High temperatures (25°C) shifted the light optimum of O. rubescens growing in low to moderate nutrient levels from 1950 lux to 800 lux.
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    URL: http://dx.doi.org/10.1007/BF00015490
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    Behavioral response of the starfish asterias forbesh to a thermal gradient (1980)
    Springer
    Hydrobiologia 71 (1980), S. 265-266 
    Details
    ISSN: 1573-5117
    Keywords: starfish ; behavior ; temperature ; thermoregulation ; Asteriasforbesii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract ThirtyAsterias fbrbesii (Echinodermata: Asteroidea: Asteriidae) were tested as a group for 3 days in a long linear trough with a thermal gradient encompassing 5–45°C. The modal thermal preferendum of the starfish was between 20 and 25°C. The starfish avoided temperatures below 15°C or above 35°C.
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    URL: http://dx.doi.org/10.1007/BF00686133
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