| 摘要: |
| 依据渤海周年的中型浮游动物网样品, 研究了小型桡足类的优势种小拟哲水蚤(Paracalanus parvus)、强额拟哲水蚤(Paracalanus crassirostris)和双刺纺锤水蚤(Acartia bifilosa) 生物量的季节变动、分布和年产量, 并与渤海大型桡足类的优势种中华哲水蚤(Calanus sinicus) 进行了比较。结果表明, 三种小型桡足类成体的年产量分别为24.89、10.83 和19.54mgC/ (m3?a) , 中华哲水蚤的年产量为18.30mgC/ (m3?a)。小型桡足类主要分布在近岸, 特别是渤海湾和莱州湾, 这里正好是许多经济鱼类的产卵场和育幼场; 而中华哲水蚤主要分布在中央水域。小型桡足类的高峰季节持续时间长, 从4 月到10 月, 覆盖了几乎所有仔稚鱼大量出现的月份; 而中华哲水蚤高峰季节持续时间短, 仅6 月和7 月。另外, 在粒度上, 小型桡足类的卵、无节幼体、桡足幼体和成体都比中华哲水蚤等大型桡足类小了一个数量级( 按体积计) , 特别适合作为仔稚鱼的饵料。因此认为, 在近海生态系统中, 小型桡足类较之大型桡足类起更为重要的作用。 |
| 关键词: 桡足类, 海洋生态系统, 渤海 |
| DOI： |
| 分类号: |
| 基金项目:国家重点基础研究发展规划项目,G1999043707号 |
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| FUNCTION PERFORMED BY SMALL COPEPODS IN MARINE ECOSYSTEM |
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WANG Rong, ZHANG Hong-Yan, WANG Ke, ZUO Tao
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Key Laboratory of Marine Ecology & Environmental Science, Institute of Oceanology, The Chinese Academy of Sciences
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| Abstract: |
| The seasonal cycle, distribution and annual production of 3 small copepods (Paracalanus parvus, Paracalanus crassirostris and Acartia bif ilosa) in the whole Bohai Sea was studied based on year round zooplankton samples by a 50cm diameter net with mesh size of 160micron. The results were compared with those of Calanus sinicus, which is the most dominant species in large copepod in the Bohai Sea. The annual production (wet weight) of adult P. parvus, P. crassirostris and A. bifilosa was 24.89, 10.83 and 19.54mgC/ (m3?a) respectively. And that for C. sinicus was 18.30 mgC/ (m3?a) . The 3 small copepods distributed mainly in the coastal area especially in the Bohai Bay and Laizhou Bay where were known as spawning ground and nursing ground of many economic fishes. By contrast, C. sinicus mainly distributed in the central part of the Bohai Sea. The peak season of 3 small copepods, from April to October, covered most of the period when the fish larvae occurred in large number. However, the peak season of C. sinicus lasted only 2months, June and July. In addition, the size (in volume) of eggs, nauplius, copepodite and adults of the small copepods, which was about one order less than that of C. sinicus, was especially suitable for early larvae of fishes as food. It is concluded that the role played by small copepods in the coastal ecosystem is much more important than that played by large copepods. |
| Key words: Copepods, Marine ecosystem, Bohai Sea |
