U.S.-GLOBEC: NWA Georges Bank. Factors determining early-life-stage survival & recruitment variability in N. Atlantic cod: a comparison bewteen NW Atlantic & Norwegian Sea

U.S.-GLOBEC：NWA 乔治银行。

• 批准号: 0535361
• 负责人: Francisco Werner
• 金额: $ 16.7万
• 依托单位: University of North Carolina at Chapel Hill
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-12-01 至 2008-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0535361&HistoricalAwards=false
• 关键词: U.S.; GLOBEC; NWA; Georges; Bank.

This study compares the ecosystems on Georges Bank and the Norwegian shelf/Barents Sea via a collaboration with Norwegian colleagues at the Institute of Marine Research (Bergen). The objective is to develop a better understanding of the interactions between fish populations and zooplankton and how these interactions are influenced by climate variability and change. This understanding will be incorporated into a model of cod recruitment through the adult stages.The overarching hypothesis is that recruitment of cod and haddock is determined by variability in survival during the egg and larval stages, which is constrained by density- and habitat-dependent factors. Two sub-hypotheses assert that (Ho1) advection of Scotian shelf water into the Gulf of Maine and (Ho2) advection of zooplankton-rich water from the Norwegian Sea into the Barents shelf increases larval cod/haddock growth and survival in each system. The approach includes: 1) Computation of physical and biological fields on a basin-scale to evaluate the relative importance of local vs. advective/upstream effects in the two systems. (2) Implementation of Lagrangian models within the regional domains to quantify retention and transport and their variability in the two systems; (3) Implementation of spatially-explicit individual-based models for larval and early juvenile fish growth which, when coupled with the observed prey data will provide growth rates in the two systems. (4) Development of asuite of indices or proxies for factors and processes affecting early-life retention/transport, growth and survival.(5) Development of models linking the dynamics of adult populations with physical and biotic factors affecting recruitment.The inter-comparison of the NW Atlantic/Georges Bank with the Norwegian Sea system, allows for a generalization of the approaches and their relevance to other locations. The development of indices based on the detailed process studies will be used to develop, parameterize and evaluate hybrid recruitment models linked to the dynamics of adult stocks of commercially important species. All results will be made publicly available on the web so that interested students, teachers, scientists or resource managers can make use of them.

这项研究通过与海洋研究所（卑尔根）的挪威同事合作，比较了乔治浅滩和挪威大陆架/巴伦支海的生态系统。目的是更好地了解鱼类种群和浮游动物之间的相互作用以及这些相互作用如何受到气候变率和变化的影响。这种理解将被纳入到成年阶段鳕鱼补充的模型中。总体假设是，鳕鱼和黑线鳕的补充是由卵和幼体阶段的存活率变异性决定的，而这种变异性受到密度和栖息地相关因素的限制。两个子假设断言，（Ho1）斯科舍陆架水平流进入缅因湾和（Ho2）富含浮游动物的水从挪威海平流进入巴伦支海陆架会增加每个系统中鳕鱼/黑线鳕幼体的生长和存活。该方法包括： 1) 计算流域规模的物理场和生物场，以评估两个系统中局部效应与平流/上游效应的相对重要性。 (2) 在区域范围内实施拉格朗日模型，以量化两个系统中的保留和运输及其变异性； (3) 实施基于空间明确的个体的幼鱼和早期幼鱼生长模型，当与观察到的猎物数据相结合时，将提供两个系统中的生长率。 (4) 开发一套影响早期生命保留/运输、生长和生存的因素和过程的指数或代理。(5) 开发将成年人群动态与影响招募的物理和生物因素联系起来的模型。西北大西洋/乔治浅滩与挪威海系统的结合，允许对这些方法及其与其他地点的相关性进行概括。基于详细过程研究的指数开发将用于开发、参数化和评估与商业重要物种的成年种群动态相关的混合招募模型。所有结果都将在网络上公开发布，以便感兴趣的学生、教师、科学家或资源管理者可以使用它们。