Effects of the 1988/89 climatic regime shift on the structure and function of the southwestern Japan/East Sea ecosystem |
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Authors: | Chang Ik Zhang Sang Cheol Yoon Jae Bong Lee |
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Affiliation: | aPukyong National University, Daeyeon3-dong, Nam-gu, Busan 608-737, South Korea;bNational Fisheries Research and Development Institute, Busan 619-902, South Korea |
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Abstract: | In this study we compared the structure of the ecosystem and the role of major species before and after 1988/89 climatic regime shift (CRS) in the southwestern Japan/East Sea. The 1988/89 CRS event changed the biomass and production of fisheries resources in the southwestern Japan/East Sea. Total biomass of all species groups in the ecosystem increased by 59% after the CRS. These results indicate that there were substantial changes in the function of major species in the southwestern Japan/East Sea ecosystem. The relative contribution of walleye pollock, at trophic level (TL) III, to the total flow of energy decreased drastically from 33.0% in the pre-CRS period to 4.3% in the post-CRS period, while that of common squid, at the same TL, doubled from 34.2% to 72.2% during the periods. |
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Keywords: | Climatic regime shift (CRS) Mass-balance model Trophic level Ecosystem structure Biomass Production |
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