Ocean temperature is a major driver of species richness in the global ocean at evolutionary time scales . This, together with temperature-driven range and phenology shifts evident across taxa and ocean ecosystems , suggests that recent ocean warming  should alter biodiversity at regional to global scales. Since previous assessments , the most common evidence supporting these expected changes is replacement of cold-adapted species by warm-adapted species within an ecosystem as waters warm . Known as tropicalisation , this phenomenon has been attributed to ocean warming  in communities as diverse as kelp, invertebrates, plankton and fish .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report