舟山渔场及邻近海域桡足类种类组成和数量分布

根据2006年8月(夏)、2007年1月(冬)、5月(春)和11月(秋)4个季节在舟山渔场及邻近海域(29°30'~31°30'N,124°30'E以西)开展海洋生态系统综合调查所获得的资料,分析了该海域桡足类的种类组成和数量分布特征。结果表明,该次调查海域共鉴定桡足类65种,其中:4个季节皆出现的种类有10种,占总种数的15.38%。优势种为中华哲水蚤(Calanus sinicus)、精致真刺水蚤(Euchaeta concinna)、微刺哲水蚤(Canthocalanus paupe)和缘齿厚壳水蚤(Scolecithrix nicobarica)等10种。根据优势度和回归贡献分析表明,春、夏、秋、冬4个季节总丰度分布主要取决于中华哲水蚤、精致真刺水蚤、缘齿厚壳水蚤和微刺哲水蚤的分布,且优势种季节更替显著。桡足类丰度高值区位于不同水系交汇的混合水域,4个季节丰度平均值变化为春季(567.4 ind·m^-3)>夏季(104.12 ind·m^-3)>秋季(97.23 ind·m^-3)>冬季(72.45 ind·m^-3)。

Species Composition and Quantitative Distribution of Copepods in Zhoushan Fishing Ground and Adjacent Waters

Based on four seasonal data of the comprehensive survey of marine ecosystem in August 2006, January, May and November 2007, this paper deals with the changes of species composition and quantitative distribution of copepods in Zhoushan fishing ground and adjacent waters (29°30'N-31°30'N, west of 124°30'E). The result shows that there are 65 species of copepods having been identified in the survey area. Ten species found in four seasons accounted for 15.38%. There were 10 dominant species appearing in four seasons, among them Calanus sinicus, Euchaeta concinna, Canthocalanus paupe and Scolecithrix nicobarica were the main dominants. In accordance with the results of dominance and regression analysis, it is clear that the four seasonal abundance distributions were mainly determined by the distribution of Calanus sinicus, Euchaeta concinna, Scolecithrix nicobarica and Canthocalanus paupe. And the seasonal variation of dominant species was remarkable. The areas of high abundance located in mix zone of water masses intersection. The trend of average abundance is the highest in spring(567.4 ind·m^-3), then in summer(104.12 ind·m^-3)and autumn(97.23 ind·m^-3), and the lowest in winter(72.45 ind·m^-3).