摘要
对342个含有食物的消化道分析结果表明，中华哲水蚤桡足幼体营浮游植物食性，主要摄食硅藻类（占其食物组成的99．7％），其中辐射圆筛藻、未查明的圆筛藻和星脐圆筛藻是它的主要摄食对象。它在渤海所摄食的食物类群，几乎没有季节变化，四季都以硅藻类居绝对优势，食物类群更替率各季平均只有0．5％。它所摄食的食物种类则有一定的季节变化，食物种类更替率各季平均为12．7％。它的摄食强度以冬季为最高；春、夏次之，秋季最低，它对环境中的饵料浮游植物有明显的选择性，集中摄食其中个体较大而且容易获得的优势种类──圆筛藻。它的食性类型与中华哲水蚤成体相同。
Analysis of 342 copepodid larvae specimens of Calanus sinicus with food in their alimentary canals showed that they are phytoplanktonivorous, and feed mainly on diatoms occupying 99.7% in their food composition, in which,Coscinodiscus radiatus, Coscinodiscus sp.and Coscinodiscus asteromphalus are their main prey. The copepodid larvae of Calanus sinicus have almost no seasonal variation in their food group. The mean food group replacement rate in four seasons is only 0.5%. But their food species has certain seasonal variations. The mean food species replacement rate in four seasons is 12.7%. Their feeding intensity is highest in winter, lower in spring and summer,lowest in autumn. They apparently prefer to feed on the most dominant and easily available phytoplankton - Coscinodiscus. Their feeding type is the same as that of the adults.
出处
《海洋水产研究》
CSCD
1998年第2期1-4,共4页
Marine Fisheries Research
基金
国家自然科学基金!39570562
