With warming, marine primary production is projected to decrease in the western and increase in the eastern Mediterranean Sea . The diversity of copepods  is projected to decline over most of the Mediterranean, albeit with regional variation . Total marine biomass  is projected to increase in the southeastern Mediterranean, whereas significant decreases are most likely in the west . The projected increase of marine heat waves in the Mediterranean Sea will add additional pressures to coastal and marine ecosystems. Warm-water fish species are expected to move northwards, while cold-water species will decline, and invasions of thermal-tolerant tropical species will increase  . Fish species richness is predicted to increase in the eastern and decrease in the western Mediterranean by 2050 but, by 2100, the cooler areas in the north will become a 'cul-de- sac' for many species . Out of 75 endemic fish species, 14 are projected to go extinct, almost all of them benthic and demersal species . The abundance of small and medium-sized pelagic fish (e.g., European
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report