A5009712547- Aquatic Ecosystems and Phytoplankton Dynamics
- Fish Ecology and Management Studies
- Marine and coastal ecosystems
- Isotope Analysis in Ecology
- Freshwater macroinvertebrate diversity and ecology
- Aquaculture Nutrition and Growth
- Microbial Community Ecology and Physiology
- Physiological and biochemical adaptations
- Environmental Toxicology and Ecotoxicology
- Aquatic Invertebrate Ecology and Behavior
- Fish Biology and Ecology Studies
- Protist diversity and phylogeny
- Algal biology and biofuel production
- Aquatic Ecosystems and Biodiversity
- Marine Bivalve and Aquaculture Studies
- Ecosystem dynamics and resilience
- Heavy metals in environment
- Species Distribution and Climate Change
- Geology and Paleoclimatology Research
- Fish biology, ecology, and behavior
- Soil and Water Nutrient Dynamics
- thermodynamics and calorimetric analyses
- Agriculture Sustainability and Environmental Impact
- Environmental DNA in Biodiversity Studies
- Biological Control of Invasive Species
Université Clermont Auvergne
2013-2024
Laboratoire Microorganismes Génome et Environnement
2012-2024
Centre National de la Recherche Scientifique
2013-2024
Groupe de Recherche en Écologie Arctique
2018-2022
Laboratoire Interdisciplinaire des Environnements Continentaux
2014
Clermont Université
2010-2013
Institut Pascal
2008
University of Konstanz
2005-2006
Limnological Institute
2005
We investigated the effect of food quality on somatic growth and reproduction zooplankton at different temperatures (12°C, 15°C, 20°C, 25°C). Standardized experiments two cladocerans, Daphnia magna Simocephalus vetulus , were performed (1) high‐quality ( Cryptomonas sp.), (2) relatively low‐quality Scenedesmus obliquus ), (3) intermediate‐quality : mixture). Food constraints cladocerans decreased with increasing temperature. For D. for S. differences between clutch size rate individuals fed...
Summary 1. Fatty acid–specific stable isotope analysis (FA‐SIA) is expected to encompass most of the limits encountered when using more classical trophic markers such as bulk tissue or fatty acid analyses. However, an essential premise for FA‐SIA studies that individual FA δ 13 C values consumer reflect those its diet. Field have so far made this assumption, which not necessarily supported by rare experimental tests. 2. A feeding experiment was conducted on Daphnia test whether acids in were...
Abstract In many ecosystems, detritus is the dominant source of energy and driver ecosystem functioning. particular, in forested headwater streams, allochthonous (e.g. leaf litter, dead wood) constitute main for detritivores living primary producers contribute marginally to metabolism flows. We hypothesised that a low consumption benthic diatoms, high‐quality resource, could be major importance growth detritivores. these resources might represent an essential polyunsaturated fatty acids (...
We investigated whether trophic repackaging of autotrophic picoplankton by phagotrophic protists is associated with an improvement in food quality for the metazooplankton Daphnia magna (i.e., upgrading occurs this system). The nutritional value species Microcystis aeruginosa PCC7806, Synechococcus sp. strain BO8809, elongatus SAG 89.79, and Choricystis minor KR1988/ 8, heterotrophic nanoflagellate Paraphysomonas grown on these different picoplanktonic was evaluated standardized growth...
Summary 1. Zooplankton are important in transferring dietary nutrients, including polyunsaturated fatty acids (PUFA), up through aquatic food webs. 2. We tested the hypothesis that taxonomic composition of zooplankton affects retention and subsequent transfer PUFA from upwards web. Using laboratory experiments, we investigated accumulation bioconversion capacities six cladoceran species ( Ceriodaphnia sp., Daphnia longispina , magna pulex Scapholeberis mucronata Simocephalus vetulus ) fed on...
Chytrids are ubiquitous fungal parasites in aquatic ecosystems, infecting representatives of all major phytoplankton groups. They repack carbon from inedible hosts into easily ingested chytrid propagules (zoospores), rendering this accessible to zooplankton. Grazing on zoospores may circumvent bottlenecks transfer imposed by the dominance or poorly nutritious (mycoloop). We explored qualitative aspects mycoloop analysing lipid profiles (fatty acids, sterols) two chytrids bloom-forming taxa...
Abstract In forested headwater streams, inconspicuous food resources such as epilithic microalgae can play a major role owing to their content of long chain polyunsaturated fatty acids (PUFAs) that are essential for macroinvertebrate development. Yet, the use these and consequences consumers life‐history traits remain scarcely studied, especially non‐herbivorous taxa. Using instream mesocosms, we aimed understand how two species, shredder detritivore ( Gammarus pulex ) scraper Rhithrogena...
Huge amounts of pollen can accumulate at the air‐water interface during floral bloom wind‐pollinated trees. We hypothesized that such rains act as subsidy pulses, promoting development a neustonic microbial food web and transfer organic carbon to aquatic consumers. During pine rain event on an oxbow lake, microorganism concentrations were by far higher in neuston, where grains accumulated, than seston. Zooplankton species also unevenly distributed two compartments. Bulk isotope isotopes...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 41:271-280 (2005) - doi:10.3354/ame041271 Trophic upgrading of picocyanobacterial carbon by ciliates for nutrition Daphnia magna Dominik Martin-Creuzburg1, 2, *, Alexandre Bec1, 3, Eric von Elert1 1Limnological Institute, Mainaustrasse 252, University Konstanz, 78464 Germany2Present address: Department Animal I,...
Abstract Fatty acid composition of the adipose tissue six carnivorous mammalian species (European otter Lutra lutra , American mink Mustela vison European Mink lutreola polecat putorius stone marten Martes foina and wild cat Felis silvestris ) was studied. These forage to differing degrees in aquatic terrestrial food webs. analysis revealed significant differences polyunsaturated fatty between species. More specifically, our results underline a gradual decrease docosahexaenoic (DHA)/linoleic...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 404:207-217 (2010) - DOI: https://doi.org/10.3354/meps08485 Nutritional importance of minor dietary sources for leaping grey mullet Liza saliens (Mugilidae) during settlement: insights from fatty acid δ13C analysis Apostolos-Manuel Koussoroplis1,2,*, Alexandre Bec1,2, Marie-Elodie Perga3, Emmanuil Koutrakis4,...
Pollen rain can lead to considerable allochthonous particulate organic carbon input into freshwater systems. However, the importance of pollen deposition for zooplankton production has not so far been considered. Here, standardized growth experiments were performed assess quality from three species ( Alnus sp., Populus and Cedrus sp.) as a food source two cladocerans Daphnia longispina Simocephalus vetulus ). Although lipid analysis revealed high polyunsaturated fatty acid (PUFA) contents in...
In this experimental study, growth, survival and fecundity of the benthic Cladoceran Simocephalus vetulus were measured when feeding on Cryptomonas ovata, Paraphysomonas vestita, Cyclidium glaucoma particulate amorphous organic matter to investigate nutritional value these food sources. Cladocerans fed Cr. ovata (autotrophic flagellate) exhibited highest growth. Par- ticulate (POM, mainly composed detrital particles) Cy. glau- coma (ciliate) supported a lower grow neonate production. P....
Abstract 1. Results from the few field studies that have tried to relate seston taxonomic and fatty acid (FA) composition suggest phytoplankton only partially explains FA composition. However, in these studies, heterotrophic components of (i.e. bacteria protists) not been accounted for. 2. The general premise this article was including contribution heterotrophs biomass can improve understanding variability This tested for an oligotrophic clearwater lake, which compositions seston,...
Abstract The accumulation of pollen grains in freshwater ecosystems may have a significant impact on nutrient dynamics, despite the extracellular wall hampering bacterial degradation and digestion by invertebrates. This is because be readily degraded saprotrophic fungi (Chytridiomycota). We tested laboratory whether free swimming chytrid zoospores grazed zooplankton, transferring pollen‐derived nutrients to zooplankton. conducted grazing growth experiments with daphnids ( Daphnia pulex D....
Abstract Consumer metabolism controls the energy uptake from environment and its allocation to biomass production. In natural ecosystems, available in food often fails predict production which is also (co)limited by relative availability of various dietary compounds. To date, link between effects chemical composition on remains elusive. Here, we measured resting metabolic rate (RMR) Daphnia magna along ontogeny when undergoing (non‐energetic) nutritional constraints. All types...
Abstract Organisms exhibit reversible physiological adjustments as a response to rapidly changing environments. Yet such plasticity of the phenotype is gradual and may lag behind environmental fluctuations, thereby affecting long‐term average performance organisms. By supplying energy essential compounds for optimal tissue building, food determines range possible phenotypic changes potentially rate at which they occur. Here, we assess how differences in dietary supply lipids modulate an...
Abstract In addition to global warming, aquatic ecosystems are currently facing multiple changes among which include in nitrogen (N) loads. While several studies have investigated both temperature and N impacts on independently, knowledge their interactive effects remains scarce. forested headwater streams, decomposition of leaf litter represents the main process ensuring transfer nutrients energy higher trophic levels, followed by autochthonous primary production, mainly ensured...