| 摘要: |
| 于1998–1999年夏季在南极普里兹湾边缘浮冰区利用稀释培养实验进行了微型浮游动物对浮游植物的摄食现场实验研究，同时对微型浮游动物的氨氮产生率进行了推算。结果表明，微型浮游动物的日摄食量为5.1–25.0mgC/(m3*d)，占浮游植物现存量的10%–65%，对初级生产力的摄食压力也较大(34%–100%)。利用微型浮游动物的摄食率推算得出其氮产生率为0.44–1.75mg/(m3*d)，达到维持现场初级生产所需氨氮的68%–536%。由此可见，微型浮游动物在南极夏季边缘浮冰区海洋生态系统中，特别是对浮游植物的生产和归宿起着十分重要的调控作用。 |
| 关键词: 微型浮游动物 摄食 氨氮产生率 普里兹湾 |
| DOI：10.11693/hyhz200006012012 |
| 分类号: |
| 基金项目:中国科学院“九五”重大A资助项目，KZ951-A1-205号;国家“九五”科技攻关资助项目，98-927-01-02号 |
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| HERBIVOROUS ACTIVITY AND NITROGEN EXCRETION OF MICROZOOPLANKTON IN THE MARGINAL ICE ZONE OF THE PRYDZ BAY, ANTARCTIC |
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LI Chao-lun, SUN Song, JI Peng, ZHANG Guang-tao, ZHANG Wu-chang
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Institute of Oceanology,The Chinese Academy of Sciences,Qingdao,266071
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| Abstract: |
| Based on the dilution technique, microzooplankton herbivorous activity was carried out in the marginal ice zone of the Prydz Bay during the austral summer, 199–1999. The microzooplankton excretion of nitrogen derived from phytoplankton was also estimated. Results showed that the herbivorous rates of the microzooplankton were between 5.1–25.0 mgC/(m3*d), equal to 10%–65% of the phytoplankton stock. The microzooplankton grazing pressure on the primary production was high (34%–100%). Excretion of phytoplankton-derived nitrogen by microzooplankton varied between 0.44–1.75 mg/(m3*d), which could potentially supply 6.8%–53.6% of phytoplankton nitrogen demand. These results support the idea that herbivourous microzooplankton are important in determining the production and fate of phytoplankton in marginal ice zone of the Prydz Bay. |
| Key words: Microzooplankton, Grazing, Nitrogen excretion, Prydz Bay |
