舟山渔场及其邻近水域春、夏季鱼类群聚结构的空间特征

根据2008年5月和8月进行的东海区主要渔场重要渔业资源的底拖网渔业资源调查资料,选取舟山渔场及其邻近水域(27°00′~31°00′N,121°30′~126°30′E)为研究海区,通过聚类分析和非参数多维标序方法(NMDS)分析调查海区鱼类群落的空间特征。结果显示:调查海区大致可分为两种群聚类型:近海群聚和外海群聚,且两种群聚类型具有较稳定的空间格局。近海群聚的特征种类为带鱼、刺鲳、小黄鱼等;外海群聚的特征种类为带鱼、鳄齿鱼、六斑刺鲀等。单个环境因素(水深、底层温度、底层盐度)中,鱼类群聚与水深的相关性最好。

The Spatial Pattern of the Fish Assemblage Structure in Spring and Summer in Zhoushan Fising Ground and Adjacent Region waters

The data of fish samples of the Zhoushan Fising Ground and adjacent waters （27°00′-31°00′N, 121°30′-126°30′E） were from bottom trawl surveys in the East China Sea and southern Yellow Sea in May and August, 2008. The spatial pattern of fish assemblages was analyzed through hierarchical cluster analysis and non-metric multidimensional scaling （NMDS）. The results showed that fishes in the studying area could be roughly divided into two main assemblages, the inshore group and the open-sea group, and the spatial pattern was relatively stable. The dominant species of the inshore group were Trichiurus lepturus, Larimichthys polyac-tis and Psenopsis anomala, etc, while T. lepturus, Champsodon snyderi and Diodon holacanthus dominated in the open-sea group. The relationships between fish assemblages and environmental factors including water depth, bottom temperature and bottom salinity were examined, and the water depth was found to be the primary factor influencing fish assemblages in the Zhoushan Fising Ground and adjacent waters.