应用生态学报2011，Vol.22Issue(12)：3321-3328,8.
长江口及其邻近水域大型水母资源量动态变化对渔业资源结构的影响
Effects of macro-jellyfish abundance dynamics on fishery resource structure in the Yangtze River estuary and its adjacent waters
摘要
Abstract
Based on the bottom trawl survey data in May 2007 and May and June 2008, this paper analyzed the effects of the abundance dynamics of macro-jellyfish on the species composition, distribution, and abundance of fishery resource in the Yangtze River estuary and its adjacent waters. From May 2007 to June 2008, the average catch per haul and the top catch per haul of macro-jellyfish increased, up to 222. 2 kg · h-1 and 1800 kg · h-1 in June 2008, respectively. The macro-jellyfish were mainly distributed in the areas around 50 m isobath, and not beyond 100 m isobath where was the joint front of the coastal waters of East China Sea, Yangtze River runoff, and Taiwan Warm Current. The main distribution area of macro-jellyfish in June migrated northward, as compared with that in May, and the highest catches of macro-jellyfish in May 2007 and May 2008 were found in the same sampling station (122.5°E, 28.5° N). In the sampling stations with higher abundance of macro-jellyfish, the fishery abundance was low, and the fishery species also changed greatly, mainly composed by small-sized species ( Trachurus japonicus, Harpadon nehereus, and Acropoma japonicum) and pelagic species (Psenopsis anomala, Octopus variabilis) and Trichiurus japonicus, and P. Anomala accounted for 23. 7% of the total catch in June 2008. Larimichthys polyactis also occupied higher proportion of the total catch in sampling stations with higher macrojellyfish abundance, but the demersal species Lophius litulon was not found, and a few crustaceans were collected. This study showed that macro-jellyfish had definite negative effects on the fishery community structure and abundance in the Yangtze River estuary fishery ecosystem, and further, changed the energy flow patterns of the ecosystem through cascading trophic interactions. Therefore, macro-jellyfish was strongly suggested to be an independent ecological group when the corresponding fishery management measures were considered.关键词
长江口/大型水母/渔业资源Key words
Yangtze River estuary/ macro-jellyfish/ fishery resource分类
生物科学引用本文复制引用
单秀娟,庄志猛,金显仕,戴芳群..长江口及其邻近水域大型水母资源量动态变化对渔业资源结构的影响[J].应用生态学报,2011,22(12):3321-3328,8.基金项目
国家重点基础研究发展计划项目(2011CB403605)、国家自然科学基金国际(地区)合作交流项目(31061160187)和山东省泰山学者专项基金项目资助. （2011CB403605）
