论文部分内容阅读
本文据东海深海1981年底鱼资源调查资料,按不同站、水深带之间计算渔获物组成的相似性指数C_2,应用聚类分析方法等综合分析,结果表明:调查海区底层鱼类可区分为东海大陆架(外缘)群落、东海大陆被群落和冲绳海槽(西侧)群落等三个(主)群落。其中,东海大陆坡群落还可细分为大陆坡上部、中部和下部等三个亚群落。同时,应用种类多样性、均匀性、丰盛度和优势度指数(H~1;D、J、d和D_2),对群落结构进行分析,结果表明:H~1、D、J或d值,一般是水深浅处较小,深处较大,它们随水深的变化趋势相似;D_2值则与以上各值大致相反。作者认为除种类组成和多样性指数外,种类相似性指数也是反映生物群落结构的一个重要特征。
Based on the survey data of fish resources at the end of 1981 in the deep sea of the East China Sea, the similarity index C_2 of the catch calculated from different stations and water depths was analyzed by cluster analysis. The results showed that the bottom fish in the survey area could be divided into The East China Sea continental shelf (outer margin) community, the East China Sea by the community and the Okinawa Trough (west side) community three (main) community. Among them, the continental slope of the East China Sea can be subdivided into three sub-communities, namely the upper part of the continental slope, the middle part and the lower part. At the same time, community structure was analyzed by species diversity, evenness, abundance and dominance index (H ~ 1; D, J, d and D_2) Generally, the depth of water is smaller and the depth is larger, and their trends with water depth are similar. The value of D_2 is roughly opposite to the above values. In addition to the species composition and diversity index, the authors think that the similarity index is also an important feature reflecting the structure of biomes.