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RATIONALE Dorsal white muscle is the standard tissue analysed in fish trophic studies using stable isotope analyses. However, sampling white muscle often implies the sacrifice of fish. Thus, we examined whether the non-lethal sampling of fin tissue can substitute muscle sampling in food web studies. METHODS Analysing muscle and fin δ(15)N and δ(13)C(More)
The hypothesis of convergence takes the deterministic view that community (or assemblage) structure can be predicted from the environment, and that the environment is expected to drive evolution in a predictable direction. Here we present results of a comparative study of freshwater fish assemblages from headwater streams in four continents (Europe, North(More)
a r t i c l e i n f o Keywords: Machine learning Young-of-the-year fishes (YOY) Predictive models Habitat variables Large rivers France Restoration tools Even if European river management and restoration are largely supported by the use of reliable tools, these tools are most often " generalist " and provide only initial leads of alteration sources.(More)
Results of a biochemical study on the genus Culicoides are reported. A method of analysis using six discriminant enzymatic systems was used and the results obtained on zymograms are detailed. A genetic study of C. nubeculosus, based on phosphoglucomutase was carried out. The processing of the data obtained, by means of correspondence analysis, provides an(More)
BACKGROUND Predicting which species are likely to go extinct is perhaps one of the most fundamental yet challenging tasks for conservation biologists. This is particularly relevant for freshwater ecosystems which tend to have the highest proportion of species threatened with extinction. According to metapopulation theories, local extinction and colonization(More)
Food-chain length (FCL) is commonly used in ecological investigations to gain insight into how ecosystems function. Several studies have investigated the mechanisms underlying FCL patterns, but none has specifically examined the effect of temperature variability. In river ecosystems, water temperature variability can modify community structure, individuals’(More)
As part of the landscape, streams are influenced by land use. Here, we contributed to the understanding of the biological impacts of land use on streams, investigating how landscape effects vary with spatial scales (local vs. regional). We adopted a food web approach integrating both biological structure and functioning, to focus on the overall effect of(More)
The upstream–downstream gradient (UDG) is a key feature of streams. For instance food webs are assumed to change from upstream to downstream. We tested this hypothesis in a small European river catchment (937 km2), and examined whether food web modifications are related to structural (i.e. food web composition) or functional changes (i.e. alteration of(More)
A variety of indices targeting a number of different biological assemblages have been developed to assess aquatic ecosystem condition, identify the drivers of alteration and provide information on possible restoration measures. Fish-based indices, commonly focused on adult assemblages, are capable of indicating declines in condition, but often provide(More)
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