浮游生物对北海鱼招募的影响
Grégory Beaugrand1, Keith M Brander, J Alistair Lindley
1CNRS, UMR 8013 ELICO, Station Marine, Université des Sciences et Technologies de Lille BP 80, 62930 Wimereux, France. gbea@mail.pml.ac.uk
Nature
|December 12, 2003
概括
过度捕捞和因温度上升而变化的浮游生物已经减少了北海的大西洋鱼的招募. 幼的鱼生存取决于猎物的大小,时间和丰度,受温度驱动的生态系统变化的影响.
科学领域:
- 海洋生物学 海洋生物学
- 渔业 科学 渔业 科学
- 生态系统动力学 生态系统动力学
背景情况:
- 自20世纪60年代末以来,北海的大西洋鱼 (Gadus morhua L.) 种群面临严重的过度开发.
- 对于鱼生物量和招聘率的下降存在重大担忧.
研究的目的:
- 调查浮游生物波动对北海鱼招募的长期影响,超出过度捕捞的影响.
- 确定影响鱼存活的关键因素以及环境变化的作用.
主要方法:
- 对鱼招募,浮游生物特征 (猎物大小,时间,丰度) 和海温的历史数据的分析.
- 应用匹配/不匹配假设来解释温度对幼虫生存的影响.
主要成果:
- 由自下而上的控制驱动的浮游生物波动,已经显著改变了鱼招募模式.
- 幼的鱼生存严重依赖于平均大小,季节性时间和它们的猎物数量.
- 自20世纪80年代中期以来,海洋温度的上升对浮游生物生态系统产生了负面影响,减少了年轻鱼的生存率.
结论:
- 过度捕捞和气候驱动的浮游生物变化对北海鱼种群产生了负面影响.
- 猎物可用性的温度介导的变化破坏了对鱼幼虫生存至关重要的匹配/不匹配动态.
- 保护战略必须考虑渔业压力和气候变化对海洋食物网的影响.
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