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  • Articles  (258)
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  • Springer  (258)
  • American Meteorological Society
  • American Physical Society (APS)
  • Copernicus
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  • 1
    Electronic Resource
    Electronic Resource
    Glutamine Synthetase activity in limnetic phytoplankton (1996)
    Springer
    Aquatic sciences 58 (1996), S. 103-119 
    Details
    ISSN: 1420-9055
    Keywords: Lake ; phytoplankton ; N-assimilation ; N-uptake ; Glutamine Synthetase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The seasonal distribution of potential Glutamine Synthetase (GS) activities was studied in eutrophic Lake Aydat (France, Massif Central). The validity of this index of N-assimilation in field studies was tested by a comparison with the coupling of distributions of inorganic nitrogen uptake rate based on14C incorporation into proteins and the amino acids to protein ratio together with several abiotic and biotic parameters. The potential GS activities recorded during the seasonal succession of phytoplankton (characterized by the dominance of diatoms) were in the same order of magnitude of those reported from the very poor literature on this subject. Over high N-NO 3 - availability, the potential GS activities recorded were close to indirect estimations of N-uptake rates. During nitrogen depletion, high potential GS activities (which coincided with a development of small diatoms) were recorded suggesting that cell metabolism adapted to N-nutrient constraints. In addition, potential GS activity evolved concomitantly to other indicators of N-uptake and N-status. However, N-assimilation rates based on the enzymatic approach were lower than those obtained through indirect isotopic determination of uptakes rates. We suggest therefore that GS was not the unique pathway of ammonium assimilation in field populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877110
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  • 2
    Electronic Resource
    Electronic Resource
    Time series of multivariate data in aquatic ecology (1995)
    Springer
    Aquatic sciences 57 (1995), S. 185-198 
    Details
    ISSN: 1420-9055
    Keywords: Time series ; multivariate data ; phytoplankton ; abiotic factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Coupling of multivariate methods and time series analysis can be ueful for studying dynamics of aquatic communities. This is demonstratred with a data set from the pelagic area of an oligo-mesotrophic lake in Central Spain during 61 consecutive days of Autumn overturn. Abiotic variables, phytoplankton species and their total biomass were traced. Species abundance and specific biomass were considered as indices of community structure and resource partitioning, respectively. Abiotic and algal data sets were subjected to factor analyses of cases separately. Atmospheric forcing and nitrogen could be considered as the main (2) driving variables of the abiotic matrix. The coupling of motile abilities and cell size was associated to the main factors of the community structure matrix whereas phosphorus limitation and species responses to buoyancy represented the main factors of the biomass matrix. Coordinates of the two first factors could be used to mimic the trajectories in the data space. Significant short term lags (1–4 days) were found in most time series. Lagged responses of atmospheric forcing and nitrogen on phytoplankton community structure and resource partitioning at scales of 1–7 days were also shown. Overall phytoplankton biomass did not show significant delayed responses, thereby suggesting that it might be resulting from the interplay of other non-studied factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877426
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  • 3
    Electronic Resource
    Electronic Resource
    Eicosanoids and Egg-Hatching Synchrony in Barnacles: Evidence Against a Dietary Precursor to Egg-Hatching Pheromone (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 2299-2312 
    Details
    ISSN: 1573-1561
    Keywords: Eicosanoids ; pheromone ; egg-hatcing ; barnacle ; phytoplankton ; lipoxygenase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The boreoarctic barnacle, Semibalanus balanoides (= Balanus balanoides) (L.), has the ability to synchronize the release of its nauplii with the spring phytoplankton bloom, thereby ensuring that the larvae can start their planktotrophic development successfully. Hatching is induced by an egg-hatching pheromone (an hydroxy fatty acid) released by the adult. Here, the possibility that the pheromone is an excretory metabolite of dietary eicosapentaenoic acid (EPA) is examined. Egg hatching could be induced by feeding gravid adult barnacles on Skeletonema costatum, but neither a concentrated culture of this diatom nor cell-free culture medium induced egg hatching in vitro. Following a 15-min incubation of EPA in seawater, a product with egg hatching activity was obtained, presumably by autooxidation. Egg hatching was not induced by feeding barnacles with lecithin liposomes containing EPA. Likewise, radiolabeled egg-hatching pheromone was not released by adult barnacles that had been fed with [14C]EPA liposomes. Egg-hatching pheromone was not released by barnacles that were actively feeding on S. costatum prior to egg-hatching. The production of egg-hatching pheromone was inhibited in vitro and in vivo by lipoxygenase inhibitors. Taken together, the results suggest that egg-hatching pheromone is not an excretory metabolite but is derived from EPA released from membrane phospholipid and acted upon by a lipoxygenase. The nature of the stimulus to precursor fatty acid release has yet to be established, but a link with molting appears tenuous.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOEC.0000006675.61630.f0
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  • 4
    Electronic Resource
    Electronic Resource
    Ducellieria chodati — Alge oder Pilz? (1981)
    Springer
    Plant systematics and evolution 138 (1981), S. 199-207 
    Details
    ISSN: 1615-6110
    Keywords: Phycomycetes ; Saprolegniales ; Xanthophyceae ; Ducellieria ; Colourless algae ; phytoplankton ; Flora of Austria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ducellieria chodati Teiling is an organism rarely mentioned from plankton samples. Its propagation was unknown, and all earlier authors have failed to see that it is a colourless organism. Because of its structure and some chemical reactions,Ducellieria was thought to be a member of theXanthophyceae. Many living coenobia ofD. chodati from several Austrian lakes and some steps of their reproduction have been studied: Zoospores with two unequal flagella are released. After a mobile phase they settle on coniferous pollen grains drifting in water. Inside the pollen grain, a tube or flask is developed from which zoospores are released again after one or two days. These aggregate to form newDucellieria coenobia. These observations suggest thatDucellieria chodati belongs to thePhycomycetes, perhaps to theSaprolegniales.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985183
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  • 5
    Electronic Resource
    Electronic Resource
    Basic Tendencies in the Structural Dynamics of Phytoplanktonic and Benthic Communities in the Sea of Azov (2000)
    Springer
    Russian journal of ecology 31 (2000), S. 411-414 
    Details
    ISSN: 1608-3334
    Keywords: phytoplankton ; zoobenthos ; ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract New data on the present-day state of planktonic and benthic communities in the Sea of Azov were obtained during an expedition organized in 1997 and 1998. The analysis of their species composition and quantitative indices of biomass and abundance revealed two obvious tendencies in the structural dynamics of biocenoses. The first is directly produced by disturbances of the environment under anthropogenic impact, and the second reflects the effect of global natural factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026643926725
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  • 6
    Electronic Resource
    Electronic Resource
    Estimation of phytoplankton photosynthesis and nutrient limitation in the Eastern Scheldt estuary using variable fluorescence (1999)
    Springer
    Aquatic ecology 33 (1999), S. 101-104 
    Details
    ISSN: 1573-5125
    Keywords: chlorophyll fluorescence ; nutrient limitation ; phytoplankton ; photosynthesis ; quantum efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009900124650
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  • 7
    Electronic Resource
    Electronic Resource
    Experimental study of the impacts of silver carp on plankton communities of eutrophic Villerest reservoir (France) (1999)
    Springer
    Aquatic ecology 33 (1999), S. 193-204 
    Details
    ISSN: 1573-5125
    Keywords: biomanipulation ; eutrophic reservoir ; mesocosm ; phytoplankton ; silver carp ; zooplankton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We examined the impact of five silver carp biomass levels (0, 8, 16, 20, and 32 g m−3) on plankton communities and water quality of Villerest eutrophic reservoir (France). We realized the experiments using outdoor mesocosms. The presence of silver carp led to changes in zooplankton and phytoplankton assemblages. High fish biomass strongly reduced cladoceran abundance (through predation). Silver carp inefficiently grazed down particles 〈 20 μm. More importantly, however, the suppression of herbivorous cladocerans resulted in the increase of small size algae which were relieved from grazing and benefit from high nutrient concentrations. In contrast, in mesocosms without fish, the dominance of cladocerans (mainly Daphnia) controlled small size algae and probably also larger size algae (colonial chlorophytes, cyanobacteria). Thus, the Secchi disc transparency increased markedly. Through cascade effects, the modification of grazers communities led to changes in the utilization patterns of the added nutrients by phytoplankton communities. In high fish biomass treatments, nutrients were more efficiently accumulated into particulate fractions compared with no-fish and low-fish biomass treatments that were characterized by higher dissolved nutrients concentrations. Zooplankton was an essential source of food for silver carp. The productivity of zooplankton sustained a moderate silver carp biomass (up to 16 g m−3). In the presence of the highest fish biomass, the productivity of zooplankton was not large enough and silver carps fed on additional phytoplankton. Although mesocosms with high fish biomass were characterized by a slight cyanobacteria development compared with other fish mesocosms, silver carp was not effective in reducing cyanobacteria dominance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009984713183
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  • 8
    Electronic Resource
    Electronic Resource
    The role of microalgae in aquaculture: situation and trends (2000)
    Springer
    Journal of applied phycology 12 (2000), S. 527-534 
    Details
    ISSN: 1573-5176
    Keywords: aquaculture ; fish ; hatchery ; microalgae ; molluscs ; phytoplankton ; post-larvae ; shrimp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Algae are utilized diversely in aquaculture, but theirmain applications are related to nutrition. They areused in toto, as a sole component or as a foodadditive to supply basic nutrients, color the flesh ofsalmonids or for other biological activities. The needfor nutritional sources safer than traditional animalproducts has renewed interest in plants in general andalgae in particular. This report deals principallywith the nutritional role of microalgae inaquaculture.The larvae of molluscs, echinoderms andcrustaceans as well as the live prey of some fishlarvae feed on microalgae. Though attempts have beenmade to substitute inert particles for thesemicro-organisms which are difficult to produce,concentrate and store, only shrimp and live prey forfish will accept inert food, and only shrimp accept itfully. Several studies have confirmed that a live,multi-specific, low-bacteria microalgal biomassremains essential for shellfish hatcheries. Majoradvances are expected from new production systemdesigns and operations, from batch-run open tanks tomore sophisticated continuously run and closed loopreactors. Studies are underway to simplify hatcheryoperations by replacing biomass produced on-site withrun-times by that produced and preserved elsewhere.Although still promising, they have not given rise, sofar, to any application for molluscs. Otherapplications of microalgae in aquaculture, from greenwater to making salmon flesh pinker, are examined.Whether produced on or off-site, there remains thequestion of cost effectiveness of microalgalproduction systems. This can only be achieved bysubstantial upscaling and improved quality control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008106304417
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  • 9
    Electronic Resource
    Electronic Resource
    Phytoplankton dynamics in the River Meuse as affected by pollution (1995)
    Springer
    Aquatic ecology 29 (1995), S. 103-116 
    Details
    ISSN: 1573-5125
    Keywords: River Meuse ; pollution ; phytoplankton ; ecological rehabilitation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The temporal and spatial dynamics of phytoplankton in the River Meuse and a number of physical and chemical parameters were analyzed to gain insight into the pollution level in the river affecting the phytoplankton community. During 1993, samples were taken every two months at eight stations along the River Meuse for physical, chemical and biological characterization of the water. In February, water samples were also taken for laboratory incubations of the natural plankton community. The algae showed a rapid successive development with highest densities (up to 77 mg chlorophylla l−1) in the middle reach of the river in spring and summer. During winter algal biomass remained very low. A substantial input of nutrients (nitrogen, phosphorus) was observed in the middle reach of the river. Concurrently, an increase in temperature and a reduction in pH was observed. Furthermore, the toxicity of polar organic compounds in the Microtox test showed a strong increase up to the city of Liège and the Belgian/Dutch border; the water quality improved further downstream. The relatively high toxicity at the location Liège was reflected in relatively low growth rates of phytoplankton in the laboratory experiments using water from these locations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02061793
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  • 10
    Electronic Resource
    Electronic Resource
    Using XAD resins to study the effects of reduced organic micropollutant concentrations in River Rhine and Meuse water on phytoplankton growth (1995)
    Springer
    Aquatic ecology 29 (1995), S. 151-156 
    Details
    ISSN: 1573-5125
    Keywords: phytoplankton ; specific growth rate ; XAD-4 ; XAD-8 ; risk assessment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laboratory incubation experiments were used to study the effect of reduced concentrations of organic micropollutants in water from the rivers Rhine and Meuse on the specific growth rate of the river phytoplankton community. Before incubation, part of the water sampled was treated with XAD-4 and XAD-8 resins to absorb dissolved organic compounds. Four dilutions were made by mixing untreated water with XAD-treated water in the ratios 100:0 (control), 70:30, 40:60 and 0:100. The phytoplankton specific growth rate increased significantly with the increased fraction treated with XAD in all but one incubation experiment. In these experiments, the specific growth rate was on average 9% higher in the fraction in which 100% was treated with XAD than in the controls. In the Rhine and Meuse river water, phytoplankton growth seemed to be inhibited by organic compounds. This inhibition was ascribed to the presence of dissolved organic micropollutants. Removing organic micropollutants using XAD resins to study the toxic effects of these compounds on field phytoplankton communities can be concluded to be a promising tool for risk assessment of micropollutants but needs to be supported by additional methodological research.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02336044
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