东海中部海域蟹类群落结构及其多样性研究

根据2008年春（5月）、夏（8月）、秋（11月）和冬（2009年2月）四季东海区桁杆拖虾M调查资料，分析了该海域蟹类群落结构的季节变化特征。结果显示，该海域四季共捕获蟹类30种，隶属十9科，16属；平均渔获质量为3173．05～9835．67g．网-1；四季调查海域中出现的优势种有双斑好（Charybdis bimaculata）、细点圆趾蟹（Ovalipes punctatus）、银光梭子蟹（Portun msargentatus）和武士蚵（Charybdis miles）4种，其中细点酬趾蟹是常年优势种；物种丰富度指数（D）为0．09～1．41，物种多样性指数（H’）为0.02～1.67，均匀度指数（J）为0．02-1．00。各群落多样性指数各季节间差异不显著（P〉0．05）。

Community structure and species diversity of crab in middle East China Sea

On the base of the survey data of beam shrimp trawl in 4 seasons of 2008 and 2009 in the East China Sea, we study the seasonal characteristics of community structure of crabs in that sea area. Thirty crab species belonging to 9 families and 16 genera were caught; the average weight of catch is 3 173.05 -9 835.67 g per haul. The dominant species are Charybdis bimaculata, Ovalipes punttarns （perennial）, Portunus argentatus and Charybdis miles. The species richness index （D） is 0. 09 -1.41, the Shannon-Wiener index （H＇） is 0. 02 - 1.67, and the species evenness index （J＇） is 0. 02 - 1.00. No significant difference is found in the diversity indices among 4 seasons （ P 〉 0. 05） .