Future ocean warming, coupled with periodic extreme heat events, is projected to lead to the continued loss of ecosystem services and ecological functions   as species further shift their distributions and/or decline in abundance . Compounding climate-driven changes in the distribution of habitat-forming species, invasive macroalgae are predicted to exhibit higher growth under all higher pCO2 and lower pH conditions . Corals and mangroves around northern Australia and kelp and seagrass around southern Australia are of critical importance for ecosystem structure and function, fishery productivity, coastal protection and carbon sequestration; these ecosystem services are therefore extremely likely2 to decline with continued warming. Equally, many species provide important ecosystem structure and function in New Zealand's seas including in the deep sea . The future level of sustainable exploitation of fisheries is dependent on how climate change impacts these ecosystems. Native kelp is projected to further decline in southeastern New Zealand with warming seas . Climate change could affect New Zealand fisheries' productivity , and both ocean warming and acidification may directly affect shellfish culture  and indirectly through changes in phytoplankton production .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report