| 摘要: |
| 为研究低氧对海洋浮游生物关键种存活、繁殖等的影响, 作者采用了实验室模拟低氧环境的方法, 研究了低溶解氧(dissolved oxygen, DO)浓度对中华哲水蚤(Calanus sinicus)致死率、产卵和孵化的影响。研究发现, 中华哲水蚤对低氧环境比较敏感, 当DO 质量浓度为2 mg/L 左右时, 中华哲水蚤会在1h 内全部死亡; 当DO 质量浓度为3 mg/L 左右时, 中华哲水蚤会在96 h 内全部死亡; 当DO 质量浓度为4~6 mg/L 时, 基本无死亡, 但对中华哲水蚤的产卵有明显抑制作用, 首次产卵时间推迟, 产卵周期缩短。当DO 质量浓度为4 mg/L 时, 基本不产卵, 当DO 质量浓度为6 mg/L 时, 产卵量也仅为常氧组的15%左右。当DO 质量浓度为4～6 mg/L 时, 中华哲水蚤所产卵的孵化率为常氧组的60%左右, 但差异不显著。可见, 低氧对中华哲水蚤的存活和繁殖均有抑制作用, 长时间低氧很可能会降低中华哲水蚤的种群数量, 甚至改变海洋生态系统结构。 |
| 关键词: 低氧 中华哲水蚤(Calanus sinicus) 死亡率 产卵率 孵化率 |
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| 基金项目:国家重点基础研究规划项目(2010CB428705); 中国科学院知识创新工程重要方向项目群(KZCX2-YW-Q07-02); 国家自然科学基金委资助项目(41121064, 41176100) |
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| The effects of hypoxia on survival and reproduction of Calanus sinicus |
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| Abstract: |
| The mortality rates and reproduction of Calanus sinicus at different concentration of dissolved oxygen (DO) were investigated. The results showed that when DO declined to 2 mg/L, C. sinicus all died in 1 h. When DO declined to 3 mg/L, C.sinicus all died in 96 h. When DO was 4-6 mg/L, basically there was no death. But the spawning rate of C. sinicus could be significantly inhibited under this hypoxia condition. When DO was 4 mg/L, almost no spawn. When DO was 6 mg/L, the total spawning amount was only 15% of nornoxic group. When DO was 4-6 mg/L, the hatching rate was 60% of nomixic group. Therefore, hypoxia inhibits both survival and reproduction of C. sinicus. Long time hypoxia would reduce the population quantities of C. sinicus and even change the structure of ecosystem. |
| Key words: Calanus sinicus mortality rate spawning rate hatching rate |
