渤海真刺唇角水蚤摄食的初步研究

1992年 8月至 1 993年 5～ 6月在渤海调查过程中取得了大量海洋浮游生物样品 ,从中获得 80 0个消化道内含有食物的真刺唇角水蚤标本 ,经分析得出 :真刺唇角水蚤营小型浮游生物食性 ,主要摄食小型桡足类 (占其食物组成的 76.4% ) ,其中小拟哲水蚤是它的主要摄食对象 ( 74.7% ) .此外 ,它也摄食少量硅藻类 ( 2 3.0 % )、甲藻类 ( 1 .1 % )、金藻类 ( <0 .1 % )和纤毛虫类 ( 1 .5% ) ;其食物组成有明显的季节变化 ;其类群更替率各季平均达 30 .7% ,其种类更替率达 40 .3% ,并显示出硅藻类自春至冬逐渐增高而桡足类逐渐降低的规律性 .其摄食强度以春季为最高 ,秋季居第二位 ,夏季居第三位 ,冬季最低 .

A preliminary study on the feeding of bohai seaLabidocera euchaeta.

Eight hundred Labidocera euchaeta specimens with food in their alimentary canal were collected from the Bohai Sea, and the analysis of their alimentary canal contents shows that Labidocera euchaeta is microplanktonivorous, and feeds mainly on micro copepods, occupying 76.4% in its food composition, in which, Paracalanus parvus is the main prey (74.7%), and others occupy a less portion on diatom (23.0%), dinoflagellates(1.1%), chrysophytes(<0.1%) and ciliates (1.5%). The food composition of this species has an obvious seasonal variation.The mean replacement rate of food group in four seasons is 30.7%, and that of food species reaches to 40.3%, showing that the diatom in its food is increased gradually from spring to winter, and on the contrary, the copepods is decreased, its feeding intensity is increased in the order of spring>autumn>summer>winter.