Physical changes in lakes  have affected primary production , algal-bloom formation and composition, zooplankton and fish size distribution, and species composition . Declines in the abundance of cold-stenothermal species, particularly the Arctic charr , coregonids and smelt, and increases in eurythermal fish  have been observed in northern temperate lakes associated with warming trends  . These changes increase predation pressure on zooplankton and reduce grazing pressure on phytoplankton, which may result in higher phytoplankton biomass . Reduction in lake mixing lowers the concentration of nutrients in the epilimnion and may lead to higher silicon-to-phosphorous ratios that negatively affect diatom growth  or overall primary productivity .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report