中文摘要：

根据1997—2000年东海23°30′～33°00′N、118°30′～128°00′E海域4个季节海洋调查资料，运用生态学指标，探讨了东海有尾类种的组成、种数季节变化和平面分布、多样性指数（H′）变化。结果表明：本次调查共记录东海有尾类6种，其中异体住囊虫（Oikopleura dioica）、长尾住囊虫（O．longicauda）和红粒住囊虫（O．rufescens）是东海的常见种，中型住囊虫（O．intermedia）也较为常见，梭形住囊虫（O．fusiformis）和Oikopleura Spp．则是稀有种；除了Oikopleura．Spp．，其他种在4个季节均有出现，种类季节交替不明显。异体住囊虫有较高的出现率，对环境有广泛的适应；长尾住囊虫也有广泛的分布，但其出现率明显低于异体住囊虫，与异体住囊虫相比，其更有暖水种的特征。红粒住囊虫出现的海区具有高温高盐的特征，可以认为该种是暖水种。中型住囊虫主要在夏季出现，也是暖水种。东海有尾类以分布在外海暖流势力控制的水域为主，显示出该类浮游动物具有暖水性的特征。东海有尾类多样性指数（H′）值较低，个别优势种的集群性，是形成多样性指数值较低的主要原因。

英文摘要：

Based on seasonal investigation at 23°30′- 33°00′N and 118°30′- 128°00′E of the East China Sea during 1997 - 2000, the species composition, seasonal variation and horizontal distribution of species number and diversity value （ H′ ） and geographical distribution of Appendicularia in the East China Sea were discussed by ecological indices. The result showed that totally six species appeared at the areas in four seasons, among which Oikopleura dioica, O. longicauda and O. rufescens were common species. Since emerged in 4 zones, O.intermedia was subordinate species. O. fusiformis and Oikopleura. spp were rare species. Except for Oikopleura.spp, all the other species appeared in all seasons in the East China Sea so that seasonal alternation was not obvious.O. dioica showed a broad adaptability to environmental factors because it distributed in almost the whole area of the sea with high occurrence frequency. O.longicauda also showed wide geographical distribution though its occurrence frequency was significantly lower than the former. Compared with the former, the latter showed more features of warm-water species. O. rufescens emerged in the zones with high temperature and salinity, which also can be classed as warm water species. The Appendicularians in the East China Sea mostly distributed at the offshore area controlled by warm current forces, thus indicated the warm water species characteristics. The diversity value （ H′ ） of Appendicularians was relatively low caused by the aggregation of some individual dominant species.