Contractions of the polar climate zones lead to distribution shifts and changes in food webs, induce declines in many species  with impacts on subsistence harvests and commercial fisheries, and threaten global dependence on polar regions for substantial marine food production . Climate change has induced food web changes resulting in population declines in polar sea birds, including penguins, and marine and terrestrial mammals . Globally and regionally important harvested fish and invertebrate species are also contracting ranges and declining productivity, including Pacific cod, salmon, snow and king crab in the Arctic and krill in the Antarctic , with implications for global food systems . 
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report