Modeling of the responses of marine living resources to global environmental changes as a basis for the management of fisheries resources

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In order to establish the ecological basis for utilization and proper management of marine living resources in the contex of global climate and ocean environmental changes, exisiting data on the long-term changes in plankton biomass and composition, fisheries catch, etc.were analyzed in the Kuroshio and Kuroshio-Oyashio transitional areas, Antarctic Ocean and Bering Sea with special reference to climate and oceanic changes in these regions. The following topics were highlighted from these analyzes ; 1) long-term changes in chlorophill concentration, phyto-and zooplankton biomass, microzooplankton comunity in the Kuroshio, Kuroshio-Oyashio transitional areas, 2) long-term changes in the biomass and species composition of micronekton such as myctophids in the Kuroshio region, 3) possible mechanisms behind dominant species replacement observed in sardine and anchovy populations in the coastal Kuroshio region, 4) climate and ocean effects on the feeding and recruitment of walleye pollock larval population in the eastern Bering Sea, 5) population dynamics of adelie penguins in the Antarctic Ocean and implications of ice edge expansion/retreat for the dynamics, 6) long-term changes in phyto-and zooplankton in Tokyo Bay responding to the eutrophication of the bay water, 7) utility and applicability of some statistical and systematic methods to predicting ecosystem changes and providing the basis for proper management of marine living resources.