东山湾浮游动物的生态

本文根据1988年5月至1989年2月于东山湾采集的浮游动物样品及水文、化学实测资料,共鉴定本海域浮游动物109种,分析结果,可分为河口、近岸及外海等3个生态类群。本海域浮游动物的总生物量系秋季最高,春季最低;总个体密度夏季最高,冬季最低;少数种类具明显的昼夜垂直移动;潮汐对浮游动物的影响主要为种类数的增减,其种类的季节演替、数量变动及分布规律与本区各种水系的运动状况密切相关。

Ecological studies of zooplankton in Dongshan Bay

The paper is based on zooplankton samples and field hydrological and chemical data collected from Dongshan Bay in the periods of May, 1988 and Feb. , 1989. All together 109 species of zooplankton were identified. According to the horzontal distribution and its ecofactors they may be divided into three ecological groups, i. e. Estuarine, Euryhaline and Offshore groups. Among them, euryhaline warm water species in euryhsline group was the most important. Centropages tenuiremis, Acrocalanus gibber, Pleurobrachia globosa, Lucifer hanseni and Pseudeuphausia sinica were dominant species in the survey region.The total biomass of zooplankton in the area was the highest in autumn and the lowest in spring. As for total individual density, it is the highest in summer and the lowest in winter. The species with marked diurnal vertical migration was in the minority. A majorty of species are surface layer distributors. The effect of tide found expression in increase and decrease in number of species for zooplankton. The seasonal changes, quantitative variation and distribution patterns of the zooplankton in the area closely related to the movement of the different water systems.