台湾海峡东部海域海樽类被囊动物的分布

Distribution of Thaliacea (Tunicata) in eastern Taiwan Strait

本文根据对1997至1999年3个航次在台湾海峡东部海域(23°30'～25°30′N,118°30′～121°00′E)采集的大型浮游动物样品的分析,首次专文报道了该海域浮游海樽类(Thaliacea)被囊动物的种类组成和数量分布,其中夏季的种类最多(11种),数量最大,平均丰度达7445×10-3个 m3,优势种是东方双尾纽鳃樽(Thaliademocraticaorientalis)、软拟海樽(Doliolettagegenbauri)和韦氏纽鳃樽(Weeliacy lindrica),而冬季的种类和个体数量最少,仅小齿海樽(Doliolumdenticulatum)的出现率较高.文章讨论了海樽类分布与水温、盐度及浮游植物丰度的关系,并与邻近海域海樽类的分布状况作了比较.

On the basis of the macrozooplankton samples of 3 cruises in the eastern waters of Taiwan Strait (23°30′～25°30′N,118°30′～121°00′E)from 1997～1999, the species composition and abundance distribution of the Thaliacea (Tunicata )were firstly described. The results showed that the most number of specices (11species )and the highest abundance(average values was 7 445×10-3inds /m3) of Thaliacea occurred in summer, and the least and lowest one was in winter. The Thalia democratica orientalis, Dolioletta gegenbauri and Weelia cylindrica were dominant species in summer. In winter the highest rate of occurrence was Doliolum denticulatum. The relationships between distribution of Thaliacea and water temperature, salinity, phytoplankton abundance were discussed, and the species composition between the eastern waters and its adjacent waters was compared.