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Non-native species modify the isotopic structure of freshwater fish communities across the globe [Ecography]

by Frédéric Magné - published on , updated on

Multiple anthropogenic pressures including the widespread introductions of non-native species threaten biodiversity and ecosystem functioning notably by modifying the trophic structure of communities. Here, we provided a global evaluation of the impacts of non-native species on the isotopic structure (δ13C and δ15N) of freshwater fish communities. We gathered the stable isotope values (n = 4030) of fish species in 496 fish communities in lentic (lakes, backwaters, reservoirs) and lotic (running waters such as streams, rivers) ecosystems throughout the world and quantified the isotopic structure of communities. Overall, we found that communities containing non-native species had a different isotopic structure than communities without non-native species.(...)

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