Since SROCC, field data have continued to show that the phenology of biological events in the ocean is very likely  advancing in response to climate change, with 71.9% of published observations consistent with these anticipated effects , although most reports  were from the Northern Hemisphere . Biological events that are shifting earlier in response to climate change include phytoplankton blooms  such as:  those of HAB species ;  peaks in zooplankton abundance ;  the migration  and spawning of commercial fish , including crabs and squid ; and  breeding of marine reptiles . Moreover, different trophic levels within epipelagic food webs are responding at different rates  , with greater and more consistent responses by lower trophic levels  but less consistent, weaker and more varied responses by higher trophic levels. There were too few independent time series to make robust estimates for benthic invertebrates, plants, marine reptiles and mammals. This differential response across trophic levels could lead to trophic mismatches , where predators and their prey respond asynchronously to climate change , with potential population-level consequences, including declines in fish recruitment . Available evidence also suggests that feeding relationships could modulate species responses to climate change,
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report