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.

多元分析提供了证据表明，白鱼的年度强度，Coregonus sp。受春天条件的强烈影响。因此，有人提出，全球变暖将导致白鱼的招募增加，直到在不明的全球变暖水平下，负面反馈机制可能会限制年级强度的进一步增加。种内竞争可能是这些反馈机制中最重要的一种。在这个项目中，我们将通过对40年的白鱼的增长来分析密度依赖的增长来探索浮游动物的白鱼对增加食物竞争（i）的行为和增长反应，以及（ii）通过评估白鱼对持续的情况，这是一种型号的情况，这种情况是a的范围，这是一种可能发生的情况，这可能会导致造成量的风化，从而增加了一种可能发生的情况。 改变。在生长季节期间的垂直分布和迁移模式将通过氢声研究研究，饮食组成和食物选择将通过定期采样鱼类进行分析。该项目的结果可能有助于设计可能在全球气候变化条件下进行白鱼股票的未来开发的情况，从而可以及时设计管理方案。