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Fluctuations of Pelagic Fish Populations in Relation to the Climate Shifts in the Far-East Regions

Journal of Ecology and Environment / Journal of Ecology and Environment, (P)2287-8327; (E)2288-1220
2007, v.30 no.1, pp.23-38








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Abstract

Based on a time series of ocean climate indices and catch records for seven pelagic fish speciesin the Tsushima Warm Current (TWC) and Kuroshio-Oyashio Curent (KOC) regions from 1910 to 2004, we detected regional synchrony in the long-term fluctuations of the fish populations and identified alternation paterns of dominant species related to climate shifts. The annual catches of Pacific herring, Japanese sardines, Japanese anchovies, jack mackerel, chub mackerel, Pacific saury and comon squid in the TWC region fluctuated in phase with those in the KOC region, which suggests that they were controlled by the same basin-wide climate forcing. After the collapse of the (1930s), Pacific saury, jack mackerel, common squid and anchovies (1950s∼1960s), herring (late 1960s∼early 1970s), chub mackerel (1970s) and then sardines (1980s). As sardine biomass decreased in the late stages of the cool regime, catch of the other four species increased immediately during the warm period of the 1990s. Regional differences in the amplitude of long-term catch fluctuations for the seven pelagic fishes could be explained by regional differences in availability, fishing techniques and activity.

keywords
Abundance, Alternation, Climate shifts, Kuroshio-Oyashio Current, Migration circuit, Pelagic fish, Synchrony, Tsushima Warm CurentGong, Yeong et al. J. Ecol. Field Biol. 30 (1) 24fishes and homogeneity in fish population structures in the two region, Abundance, Alternation, Climate shifts, Kuroshio-Oyashio Current, Migration circuit, Pelagic fish, Synchrony, Tsushima Warm CurentGong, Yeong et al. J. Ecol. Field Biol. 30 (1) 24fishes and homogeneity in fish population structures in the two region

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(2007) Received January 4 2007 Accepted February 8 2007,

Journal of Ecology and Environment