Climate impacts on Arctic marine food webs will be profound and intensify with GWL , regardless of mitigation scenarios due to multi-decadal lags in sea ice extent and atmospheric carbon  . However, the exact nature of these impacts remains unclear due to attenuating and amplifying dynamics of both top-down and bottom-up processes in polar food webs and the management of fisheries   . Projected sea ice loss is associated with a >50% decline in the density of large zooplankton species by 2100  in the southern Bering Sea and a net increase in large zooplankton in the Northern Bering Sea in scenarios without carbon mitigation  8.5), whereas these declines are roughly half the magnitude under moderate mitigation scenarios  . Warming is expected to reduce the quantity and quality of lipid-rich copepod prey  , leading to declines in survival and growth of multiple upper-trophic level fish species; these impacts are amplified over time under low mitigation scenarios    . Marine mammals and sea birds will continue to attenuate climate change impacts by shifting their diets and behaviour   . However, sea birds generally have low temperature-mediated plasticity of reproductive timing, making them vulnerable to mismatches with their prey and limiting long-term adaptation  .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report