台湾海峡西部海域浮游端足类的分布

DISTRIBUTION OF PLANKTONIC AMPHIPODA IN WESTERN TAIWAN STRAIT

本文根据1984年5月—1985年2月台湾海峡西部海域调查所获的样品及资料,分析报道了本海域浮游端足类的种类组成、总量的季节变化与平面分布、主要种的季节变化、昼夜垂直移动节律,并探讨其分布与环境因子的关系。

The present paper is based on samples of planktonic Amphipodaina comprephe nsive investigation and field hydrological and chemical data collected from the western Taiwan Strait(116°40′-120°30′E,22°22,9′-25°43′N)in the periods of May,1984 and Feb.,1985.50 species of planktonic Amphipoda belonging to 28 genera in 10 families were found,all of which were warm water species.Basing on the differences in range of salinity adaptation,the planktonic Amhipoda in the area can be classified into two ecological groups,i.e.euryhaline warm water group and high-temperature and high-salinity group.Among them,the euryhaline warm water species Hyperioides sibaginis,Lestrigonus bengalensis and L.macrophthalmus regulated the variation of the total amount of planktonic Amphipoda in the area.The mean annual individuals of were about 72%of the total amount of the planktonic Amphipoda.In addition,Brachyscelsu globiceps,B.crusculum and Amphithyrus sculpturatus also played an important role in summer.The total individual number of the planktonic Amphipoda in the area was the highest in summer and the lowest in winter.The hishest value was 33 times more of the lowest value.The marked diurnal vertical migration to the lower layer by day and rising towards the surface by night was shown by of the most abundant species Hyperioides sibaginis.Among the affecting factors,light appeared to be the most important.The seasonal changes,quantitative variation and distributional patterns of the planktonic Amphipoda in the area were closely related to the movement,intensification and decay and interaction of the different water systems,Kuroshio subcurrent,South China Sea warm current and coastal currents.