浮游动物在贝类筏式养殖区内、外生态特征研究

１９９６年６～１０月对大李家湾贝类筏式养殖区内、外浮游动物进行了生态调查研究。结果表明，浮游动物种类组成以小型挠足类为主。浮游动物数量在养殖区内、外具有相同的分布趋势，７月最高，９月次之，１０月最低。浮游动物在养殖区外的数量明显高于养殖区内，前者是后者的１．６～２．３倍。优势种小拟哲水蚤和鸟喙尖头氵蚤数量分布明显反映出浮游动物数量分布特征，而近缘大眼剑水蚤在养殖区内、外的数量则差异不大。

A Study on Ecological Characteristics of Zooplankton Inside and Outside Raft Mariculture Areas of Molluscs

An investigation was made of the ecological characteristics of zooplankton inside and outside the raft mariculture areas of molluscs in Dalijia Bay, Dalian City from June to October, 1996. The results indicate that the zooplankton was mainly composed of small copepodites in the investigated area. The amounts of zooplankton inside and outside the mariculture area had the same trends of distribution which show a maximum in July, next in September and a mininum in October. The amount of zooplankton outside the mariculture area was obviously more than (1.6 to 2.3 times) that inside. The quantitative distribution of the dominant species, such as Paracalanus parvus and Penila avirostris markedly reflected the quantitative distribution features of the zooplankton. Meanwhile, the amounts of Corycaeus affinis inside and outside the mariculture area did not differ much.