The influence of global climate change on growth and population dynamics of zooplanktivorous whitefish (Coregonus sp.)

全球气候变化对浮游动物食性白鲑（Coregonus sp.）生长和种群动态的影响

• 批准号: 5429777
• 负责人: Professor Dr. Reiner Eckmann
• 金额: --
• 依托单位: Limnologisches Institut
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5429777?language=en
• 关键词: influence; global; climate; change; growth

Multivariate analysis has provided evidence that year-class strength of whitefish, Coregonus sp. is strongly influenced by spring weather conditions. It has therefore been suggested that global warming will result in increasing whitefish recruitment, until at some unknown level of global warming, negative feedback mechanisms will likely limit further increases in year- class strength. Intraspecific competition for food is probably one of the most important of these feedback mechanisms. In this project we will explore the behavioural and growth responses of zooplanktivorous whitefish to increased competition for food (i) by analysing density-dependant growth via back-calculation of growth for 40 year-classes of whitefish, and (ii) by evaluating responses of whitefish to the ongoing process of re-oligotrophication, a situation which is considered as a model scenario of what might occur when whitefish population size increases as a result of global climate change. Vertical distribution and migration patterns during the growing season will be studied by hydroacoustics, and diet composition and food selection will be analysed through regular sampling of fish. The results of this project may help to devise possible scenarios for the future development of whitefish stocks under conditions of global climate change, so that management options can be devised in time.

多变量分析提供了证据表明白鲑 (Coregonus sp.) 的年级强度。受春季天气条件的影响很大。因此，有人认为，全球变暖将导致白鲑补充量的增加，直到全球变暖达到某种未知的水平，负反馈机制可能会限制年级强度的进一步增加。种内食物竞争可能是这些反馈机制中最重要的一种。在这个项目中，我们将探索浮游动物食性白鲑对食物竞争加剧的行为和生长反应（i）通过对 40 年级别白鲑的生长进行反算来分析密度依赖性生长，以及（ii）通过评估白鲑鱼正在经历持续的重新寡营养化过程，这种情况被认为是全球气候变化导致白鲑鱼种群规模增加时可能发生的情况的模型情景。将通过水声学研究生长季节的垂直分布和迁徙模式，并通过定期对鱼类取样来分析饮食组成和食物选择。该项目的结果可能有助于设计全球气候变化条件下白鲑种群未来发展的可能情景，以便及时制定管理方案。