Molluscs are projected to be the most at-risk group, given their limited dispersal capability . Mediterranean freshwater fish are especially susceptible to climate change due to increasing flood and drought events and the risk of surpassing critical temperature thresholds . In southern Europe, aquatic insects  are endangered by climate change . European protected areas are not expected to be sufficient under warming to provide habitat for the majority of rare molluscs and fish . Observed trends agree with model projections in direction, but magnitude remains uncertain  .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report