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Changes in fish diversity and community structure in the central and southern Yellow Sea from 2003 to 2015

Journal of Oceanology and Limnology 2018年第3期36卷 805-817页

作者： CHEN Yunlong SHAN Xiujuan JIN Xianshi JOHANNESSEN Arne YANG Tao DAI Fangqun Institute of Oceanology Chinese Academy of SciencesQingdao 266071China Function Laboratory for Marine fisheries Science and Food Production Processes Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Key Laboratory of Sustainable Development of Marine fisheries Ministry of AgricultureShandong Provincial Key Laboratory of Fishery Resources and Ecological EnvironmentYellow Sea Fisheries Research InstituteChinese Academy of Fishery SciencesQingdao 266071China University of Chinese Academy of Seiences Beijing 100049China Department of Biology University of BergenPO Box78035006 BergenNorway

The central and southern Yellow Sea is an important overwintering ground for many fish species in the Bohai Sea and Yellow Sea. For better understanding the status of the fish community after years of heavy exploitation, variations in fish community structure and diversity were analyzed using data from bottom trawls during 2003–2015. Five fish assemblage indices all showed fluctuations without clear trends from 2003 to 2015, yet there were strong positive and significant correlations(P dominant species accounted for a high weight percentage(49.7%–82.1%) in the annual fish catch. Multivariate analysis showed that two year groups could be pooled for the fish community: Group Ⅰ consisted of the years 2006, 2007, 2008 and 2015, while Group Ⅱ consisted of the years 2003, 2004, 2005, 2009, 2010 and 2014; the groups aggregated with 63.71% similarity, indicating a high level of similarity among all years. The multivariate dispersion values were 1.455 and 0.818 for Groups Ⅰ and Ⅱ, respectively, indicating greater variances in fish assemblage structure in Group Ⅰ than that in Group Ⅱ. Similarity of percentage analysis demonstrated that the average similarities for Group Ⅰ and Group Ⅱ were 71.58% and 67.51%, respectively. Size-spectra analysis revealed no consistent trend in the intercept and slope( P > 0.05); there were also no significant differences between the slope of the size-spectra and fishing ef fort. The catch per unit ef fort and mean individual weight analyses of the whole fish assemblage both showed a significantly decreasing trend over time. Overall, the results showed that the fish community structure in the central and southern Yellow Sea was relatively stable from 2003 to 2015 and the study could be used as a reference for supporting ecosystem-based fishery management.

关键词： dominant species fish community structure multivariate analysis trawl data

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