南极普里兹湾夏季边缘浮冰区两种主要浮游桡足类的代谢研究  

METABOLISM OF TWO DOMINATING COPEPODS: - CALANOIDES ACUTUS- AND- METRIDIA GERLACHEI- IN THE MARGINAL ICE ZONE OF THE PRYDZ BAY, ANTACTICA IN SUMMER

作　　者：李超伦[1] 孙松[1] 张光涛[1] 吉鹏[1] 

机构地区：[1]中国科学院海洋研究所,青岛266071

出　　处：《极地研究》2000年第3期183-190,共8页Chinese Journal of Polar Research

基　　金：中国科学院95重大A!( KZ951 -A1 -2 0 5);国家科技攻关!(98-927-0 1-0 2)资助项目

摘　　要：于 1 998年 1 2月至 1 999年 1月南极夏季 ,对南大洋普里兹湾临近海域两种主要浮游桡足类Calanoides acutus和 Metridia gerlachei的耗氧率和排氨率进行了现场调查 ,同时对其代谢产物对海洋初级生产的贡献进行了探讨。调查结果表明 ,C. acutus的体碳、氮含量占干重百分比分别为 48.4%～ 48.6%和 6.1 %～ 6.5% ;M.gerlachei分别为 47.1 %～ 50 .1 %和 5.9%～ 7.4%。C.acutus在不同海区耗氧率有一定的差异 (0 .2 2 6～ 0 .558μl O2 mg- 1h- 1)。排氨率变化范围为 0 .0 1 4～ 1 .0 58μg N mg- 1h- 1,最高值位于浮冰区 - 9站 ,在陆冰缘区 (FI站 )最小。不同海域其排氨率的高低与现场水温无相关性。不同站位上 C.acutus的 O:N比相差 5～ 6倍。M.gerlachei耗氧率为 0 .488～ 0 .644μl O2 mg- 1h- 1,排氨率为 0 .0 1 5～ 0 .0 34μg N mg- 1h- 1。根据代谢实验结果和桡足类自身碳氮含量推算 ,其维持正常代谢的碳、氮日损失率分别为 0 .59%～ 1 .99%和 0 .44%～ 3.2 7%。桡足类群体每天的碳需求量占初级生产力的 0 .6%～ 2 9.2 % ,氨氮日输出量占初级生产所需氮盐的 0 .2 %～ 38.0 %。Metabolic rates (oxygen consumption and ammonia excretion) of two dominating copepods, Calanoides acutus and Metridia gerlachei , were measured during the austral summer (December 1998-January 1999), in the marginal ice zone of the Prydz Bay. The elemental composition (C and N) were also analysed on the specimens used in these metabolic experiments. The results showed that C. acutus was 48.4%-48.6% of dry weight in carbon content and 6.1%-6.5% of dry weight in nitrogen content. Metridia gerlachei was 47.1%-50.1% and 5.9%-7.4%, relatively. Oxygen consumption rates of C. acutus were variant in the different areas (0.226 to 0.558μl O 2mg -1 h -1 ). And its ammonia excretion rates ranged from 0.014 to 1.058μg N mg -1 h -1 . The ratio between the rates (O∶N) exhibited a large defference(5-6 times). For Metridia gerlachei , oxygen consumption rates were 0.488-0.644μl O 2mg -1 h -1 and ammonia excretion rates were 0.015-0.034μg N mg -1 h -1 . From the results of metabolic rate measuremts and elemental analyses, daily losses of body carbon and nitrogen were estimated to be 0.59% - 1.99% and 0.44% - 3.27%, respectively. The metabolic carbon requirements represented about 0.6%-29.2% of primary production per day, and their excretion of ammonia contributed 0.2%-38.0% of daily phytoplankton nitrogen demand.

关 键 词：普里兹湾 南极 夏季 浮游桡足类 耗氧率 排氨率 

分 类 号：Q959.223.3[生物学—动物学] Q178.53