International consensus on the reality of climate change is now apparent: global warming is ascribable in large part to human activities. It is causing rapid deterioration of the environment and is increasing the threat to biodiversity. However, the mechanisms of its impact are still poorly known, particularly in the aquatic environment. At Cemagref, two researchers, who have been analysing the freshwater fish community over the two last decades, have observed profound changes that are more intense and long-lasting than predicted.

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