Temporal trends in freshwater biodiversity
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Abstract
If there is no doubt that biodiversity declines at a global scale, surprisingly the literature on this topic raises contrasting conclusions about local biodiversity trends. We still have an incomplete understanding of how ecosystems evolve under global change. Here, we aimed to characterize the recent temporal dynamics of river biodiversity in France, from both a taxonomic and a functional point of view, concerning different key organisms (diatoms, macro-invertebrates and fish), with a large range of biodiversity metrics and over a multi-decade period. Our results on sensitive taxa recovery in all three groups provided strong evidence that water quality management in France over the past decades successfully decreased nutrient loads in streams. On the other hand, diatom and to a lesser extent fish richness declined over time, while macroinvertebrate taxonomic richness increased. Finally, the study revealed consistent rearrangements within stream communities, with a shift from planktonic to benthic primary production, resulting in functional changes in macro-invertebrate and fish trait composition.
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