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  • 1
    Electronic Resource
    Electronic Resource
    Leaf respiration during early plastidogenesis in light-grown barley seedlings (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 68 (1986), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Oxygen fluxes of protoplasts from different developmental regions of light-grown (16 h day/8 h dark) barley (Hordeum vulgare L. cv. Patty) seedlings were studied using oxygen electrodes as well as with a more sensitive technique of oxygen exchange measurement, Cartesian-diver microrespirometry. A pronounced increase in dark respiration of protoplasts from the region close to the intercalary meristem was observed, especially below the amyloplast region. In the dark this region also displayed the greatest activity of the alternative (cyanide-insensitive) mitochondrial electron-flow pathway, possibly due to high intracellular sugar levels and suitable cytosolic energy charge engaging the pathway. Etiolated protoplasts from similar regions of dark-grown barley seedlings close to the intercalary meristem displayed a reduced dark respiratory rate which suggests that mitochondrial participation prior to normal plastid development is a partially light-initiated process, probably acting through the agency of phytochrome and a blue light receptor. These results demonstrate that in normal light-grown seedlings, just as in algal and etiolated greening systems, mitochondrial participation is vital for the very early stages of plastid development and may be controlled at least partly through phytochrome action as well as a blue light receptor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1986.tb06602.x
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of temperature on size and development in three species of benthic copepod (1985)
    Springer
    Oecologia 67 (1985), S. 295-297 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The effect of temperature on the size and development times of three benthic cyclopoid copepods, Acanthocyclops viridis, A. vernalis and Macrocyclops albidus were investigated within the normal environmental temperature range (5°C–20°C). Adult weight decreased as temperature increased. All three species complete their development at 5°C and development times at all temperatures are presented as curvilinear logarithmic temperature functions. The duration of development decreases as temperature rises. The results are compared with those reported else-where for benthic and planktonic species and the ecological implications are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00384303
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  • 3
    Electronic Resource
    Electronic Resource
    Energy partitioning in three species of nematode from polysaprobic environments (1985)
    Springer
    Oecologia 65 (1985), S. 289-295 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The partitioning of energy in three species of nematode, Paroigolaimella bernensis, Diplogasteritus nudicapitatus and Rhabditis curvicaudata, from a polysaprobic environment is considered. Temperature was shown to have a profound impact on the rate at which these organisms obtained food resources and on the partitioning of energy into growth, reproduction and maintenance. Declining temperature resulted in a reduction in energy consumption and in production and maintenance costs. Absorption efficiencies were relatively low, rarely exceeding 20% and lying on average between 5–15%. Net production efficiencies varied throughout the life-cycle, but attained maximum levels of 70–80%. Females achieved higher net production efficiency than males. The physiology and ecological implications are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379232
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  • 4
    Electronic Resource
    Electronic Resource
    Respiratory studies on two benthic copepods Acanthocyclops viridis and Eucyclops agilis at environmental temperatures (1985)
    Springer
    Oecologia 65 (1985), S. 566-572 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The rate of oxygen consumption in all developmental stages of two benthic cyclopoid copepod species, Acanthocyclops viridis (Jurine) and Eucyclops agilis (Koch, Sars) was investigated at temperatures between 5° C–20° C, which are reflective of the environmental temperature range of the benthic zone in Esthwaite Water, Cumbria, from which the organisms were derived. The larger species, A. viridis was found to have a temperature insensitive metabolism, whereas E. agilis showed a marked temperature response in respiratory function. Gravid and non-gravid females had similar rates of respiration except at 15° C–20° C in E. agilis. Males exhibited much lower respiration rates than females, but higher weight specific respiration rates; these differences were largely attributable to size differentials between the sexes. Estimates of swimming activity were made and these were related to the patterns of respiratory function observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379674
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  • 5
    Electronic Resource
    Electronic Resource
    The behavioural responses and tolerance of freshwater benthic cyclopoid copepods to hypoxia and anoxia (1985)
    Springer
    Hydrobiologia 127 (1985), S. 257-263 
    Details
    ISSN: 1573-5117
    Keywords: anoxia ; behaviour ; copepod ; hypoxia ; migration ; respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The response of four benthic cyclopoid copepods, Acanthocyclops viridis (Megacyclops viridis) (Jurine, 1820), Macrocyclops albidus (Jurine), Eucyclops agilis (Koch, Sars) (Eucyclops serrulatus) (Fischer, 1851) and Paracyclops fimbriatus (Fischer), to hypoxia and anoxia was investigated. All of these species died within six hours when confronted by totally anoxic conditions, but all survived four days at oxygen saturation levels as low as 25%. Males succumbed to the effects of anoxia more rapidly than the larger females of each species, and larger species survived for shorter periods than smaller species. In artificially stratified columns, where the lower layer was anoxic, all four species displayed an upward migratory response towards oxygenated conditions. Where the artificial hypolimnion was hypoxic, however, the migratory response was not observed. The results suggest that some benthic copepods cope with seasonal anoxia in eutrophic stratified lakes by migration rather than the various physiological adaptations shown by planktonic and semi-planktonic species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000008
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  • 6
    Electronic Resource
    Electronic Resource
    The behavioural responses and tolerance of freshwater benthic cyclopoid copepods to hypoxia and anoxia (1985)
    Springer
    Hydrobiologia 127 (1985), S. 257-263 
    Details
    ISSN: 1573-5117
    Keywords: anoxia ; behaviour ; copepod ; hypoxia ; migration ; respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The response of four benthic cyclopoid copepods,Acanthocyclops viridis (Megacyclops viridis) (Jurine, 1820),Macrocyclops albidus (Jurine),Eucyclops agilis (Koch, Sars) (Eucyclops serrulatus) (Fischer, 1851) andParacyclops fimbriatus (Fischer), to hypoxia and anoxia was investigated. All of these species died within six hours when confronted by totally anoxic conditions, but all survived four days at oxygen saturation levels as low as 25%. Males succumbed to the effects of anoxia more rapidly than the larger females of each species, and larger species survived for shorter periods than smaller species. In artificially stratified columns, where the lower layer was anoxic, all four species displayed an upward migratory response towards oxygenated conditions. Where the artificial hypolimnion was hypoxic, however, the migratory response was not observed. The results suggest that some benthic copepods cope with seasonal anoxia in eutrophic stratified lakes by migration rather than the various physiological adaptations shown by planktonic and semi-planktonic species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024230
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  • 7
    Electronic Resource
    Electronic Resource
    The temporal and spatial distribution of nematodes in percolating filters (1988)
    Springer
    Hydrobiologia 160 (1988), S. 249-255 
    Details
    ISSN: 1573-5117
    Keywords: bacterivore ; nematode ; sewage treatment ; spatial distribution ; seasonal distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The spatial and temporal distribution of nematodes in two low rate percolating filter bed sewage treatment plants at Carnforth and Caton, Lancashire, were investigated. Nematodes were abundant reaching densities up to 900 cm−2 of media surface. Numbers decreased down the bed and species composition displayed spatial differences with bed depth. Eight orders of nematode were represented, members of the sub-family Diplogasterinae and Rhabditinae were particularly common. A seasonal pattern of abundance was clearly apparent; two peaks occurred, one in May and a second during the winter months. Lowest numbers corresponded with periods of highest temperature. The demise of the nematodes in the spring was related to the sloughing of the surface film on the media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007139
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  • 8
    Electronic Resource
    Electronic Resource
    The distribution and abundance of benthic cyclopoid copepods in Esthwaite Water, Cumbria (1986)
    Springer
    Hydrobiologia 131 (1986), S. 225-234 
    Details
    ISSN: 1573-5117
    Keywords: anoxia ; benthos ; copepod ; diapause ; migration ; stratification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The spatial and temporal distribution of the benthic cyclopoid copepods, Acanthocyclops viridis, Acanthocyclops bicuspidatus, Eucyclops agilis, Paracyclops fimbriatus and Macrocyclops albidus in a small eutrophic lake Esthwaite Water, Cumbria was investigated in 1982 and 1983. The behavioural and physiological mechanisms by which these organisms cope with the conditions of hypoxia and anoxia prevalent during seasonal stratification of the lake waters was considered. During stratification all of these species, with the exception of resting stage A. bicuspidatus, disappeared from the profundal zone and were limited to the shallower margins of the lake. None of these copepod species entered the plankton and established planktonic populations, none appeared capable of sustained anaerobic respiration, although all can withstand some degree of hypoxia, and only A. bicuspidatus appeared capable of entering resting stages. The data suggest that in eutrophic lakes species normally found in the profundus deal with anoxia by lateral migration to shallow waters where oxygen is available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008858
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  • 9
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    The temporal and spatial distribution of nematodes in percolating filters (1988)
    Springer
    Details
    Publication Date: 1988-03-01
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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  • 10
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    The behavioural responses and tolerance of freshwater benthic cyclopoid copepods to hypoxia and anoxia (1985)
    Springer
    Details
    Publication Date: 1985-08-01
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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