秋季南黄海浮游动物分布及其影响因素

基于2007年秋季在南黄海（32°20'~37°00'N;124°E以西）进行的浮游动物及环境因子大面调查;分析了秋季南黄海浮游动物种类组成、分布特征及其影响因素;主要结果如下:共鉴定浮游动物113种（不包括25种浮游幼体）;中华哲水蚤（Calanus sinicus）、强壮滨箭虫（Aidanosagitta crassa）、磷虾幼体（Euphausia larvae）和小齿海樽（Doliolum denticulatum）是秋季优势种;浮游动物丰度为（156.37±12.04）ind/m3;生物量为（172.57±10.41）mg/m3;与历史调查数据相比;本航次浮游动物丰度和生物量相对处于较高水平;磷虾幼体分布趋势与中华假磷虾（Psudeuphausia sinica）一致;说明秋季是中华假磷虾种群的一个重要的补充时期;小齿海樽在南黄海的大量出现系自身种群补充的结果;精致真刺水蚤（Euchaeta concinna）和肥胖软箭虫（Flaccisagitta enflata）主要分布在深水区;在近岸海区很少出现。中华哲水蚤、强壮滨箭虫丰度高值区倾向分布于海洋锋附近;进一步佐证了海洋锋对浮游动物的积聚作用。

Distribution pattern of zooplankton and its influencing factors in the South Yellow Sea in autumn

Based on the data of zooplankton and relative environmental factors investigated in the South Yellow Sea (32°20''-37°00''N, west of 124°E) during October to December, 2007, species composition, distribution pattern of zooplankton and their influencing factors were analysed. Results are as follows:113 species of zooplankton were identified (not including 25 planktonic larvae), Calanus sinicus, Aidanosagitta crassa, Euphausia larvae and Doliolum denticulatum were the dominant species; the abundance and biomass of zooplankton in our cruise was (156.37±12.04) ind/m³ and (172.57±10.41) mg/m³, respectively, which remained at a high level compared with historical data; distribution pattern of Euphausia larvae was in accordance with that of Pseudeuphausia sinica, therefore, autumn is a critical period for the population recruitment of P. sinica; the mass occurance of D. denticulatum was the result of population recruitment; the distribution area of Euchaeta concinna and Flaccisagitta enflata was located in the deeper water and the two species rarely occurred in coastal waters; high abundance of C. sinicus and A. crassa tended to occur near the oceanic front, which further testified the accumulation effect of oceanic front on zooplankton species.