'Phenological metrics for many species of marine organisms have changed in the last half century , though many regions and many species of marine organisms remain under-sampled or even unsampled. The changes vary with location and with species . There is a strong dependence of survival in higher trophic-level organisms  on the availability of food at various stages in their life cycle, which in turn depends on the phenologies of both . There is a gap in our understanding of how the varied responses of marine organisms to climate change, from a phenological perspective, might threaten the stability and integrity of entire ecosystems.'
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report