渤海中南部春秋季浮游动物群落结构

THE STRUCTURE OF ZOOPLANKTON COMMUNITY IN THE CENTRAL AND SOUTHERN PART OF THE BOHAI SEA,CHINA,IN SPRING AND AUTUMN

1950年以前有关报道渤海浮游动物的文献很少。1958～1959年的全国海洋普查取得了大量的浮游动物资料(中华人民共和国科学技术委员会海洋组海洋综合调查办公室编,1964)。1982～1984年,在一年多的时间里,先后进行了每月一次的浮游动物调查(白雪娥等,1991)。1984年8月,11月和1985年2月,5月,有4个季度的浮游动物调查(孟凡等,

The central and southern parts of the Bohai Sea was investigated by the authors during a cruise by the R. V. Dongfanghong No. 2 in September and October, 1998 and April and May, 1999. Except for larval zooplankton, 53 zooplankton species were identified. Labidocera euchaeta , and Sagitta crassa dominated in autumn, 1998. While Calanus sinicus, Centropages mcmurrichi dominated in spring, 1999. Copepods accounted for 32% -83% of the total mesozooplankton abundance in the 4 investigations. S. crassa accounted for 33% -38% of the total abundance in autumn. A medusa, Rathdea Octopunctata, occurred in abundance at some stations in spring, 1999. The maximum abundance of C. sinicus was 249 and 1442 ind. /m3 in autumn and spring respectively. The maximum abundance of L. euchaeta and S. crassa in autumn was 494 and 283 ind./m3, respectively. In the spring, the abundance of C. mcmurrichi reached its maximum of 2605 ind. /m3. The biomass (wet weight in mg/m3) of zooplankton ranged from 26 - 488 ind. /m3 (143 ind. /m3 on average) in Sep 1998, 35 - 477 ind. /m3(167 ind. /m3 on average at 30 stations) in Oct 1998, 36-1257 ind./m3(293 ind./m3 on average) in Apr 1999 and 88-916 ind./m3(321 ind. /m3on average) in May 1999.