SROCC assessed that reduced food supply to the deep sea will drive a reduction in abyssal seafloor biota by 2100 for RCP8.5 . Simulations from one size-resolved benthic biomass model coupled to an ocean-biogeochemistry model forced with the CMIP5 ESM HadGEM2-ES  project a decline in the globally integrated total seafloor biomass of -1.1 and -17.6% by 2100 under RCP2.6 and RCP8.5, respectively . In waters shallower than 100 m, total benthic biomass is projected to increase by 3.2% on average by 2100 under RCP8.5, primarily driven by warming-increased growth rates , while at depths >2000 m , declines of -32% arise from climate-driven decreases in surface primary production and POC flux to the seafloor . These patterns are qualitatively similar under RCP2.6, except in the
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report