Observations since AR5 and SROCC  find increased impacts of ocean warming on rocky shores. This includes extirpation of species at the warm edge of their ranges , extension of poleward range boundaries , mortality from climate extremes , reduction in survival at shallower depths  and reorganisation of communities . Data collected after MHWs find ecological phase shifts   and homogenisation of communities  . For example, the collapse of sea star populations in the Northeast Pacific due to a MHW-related disease outbreak , including 80-100% loss of the common predatory sunflower star, Pycnopodia helianthoides  , triggered shifts from kelp- to urchin- dominated ecosystems .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report