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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)
The fish communities of 371 sites from 4 natural regions of the Seine River basin were studied. The sites were located from small to medium size rivers (catchment area : 5 to 3895 km2). We examined the differences between local communities according to river size (estimated by catchment area) and region. In the Seine River basin, fish communities follow a(More)
Spatial variation of quality of fish communities in the whole Seine basin and nearby coastal streams were examined by the Index of Biotic Integrity (IBI). The relationship between quality of fish communities and river alteration was also studied. A trend of fish community degradation was found from the periphery to the centre of the basin and from upstream(More)
a UMR CNRS 5178-IRD 207-MNHN-UPMC « Biologie des Organismes et Écosystèmes Aquatiques », DMPA, Muséum National d'Histoire Naturelle, 43 rue Cuvier 75005 Paris, France b UR « Hydrosystèmes et bioprocédés », Cemagref, 1 rue Pierre-Gilles de Gennes, CS 10030, F-92 761 Antony, France c UMR 5119 ECOSYM « Ecologie des Systèmes Marins Côtiers »(More)
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 Seine, which flows through greater Paris whose population is nearly 10 million, is one of the most severely damaged European rivers. Considering several published studies, this paper examines the consequences for the fish communities of the development of Paris. Three major impacts are studied: river modifications for navigational purposes, control of(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)
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)
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)