Collaborative Research: BEST Synthesis: Integration and modeling of spatial-temporal variation in vital rates for euphausiids in eastern Bering Sea: Implications for demographics

合作研究：最佳综合：白令海东部磷虾生命率时空变化的整合和建模：对人口统计的影响

• 批准号: 1107720
• 负责人: Hongsheng Bi
• 金额: $ 29.32万
• 依托单位: University of Maryland Center for Environmental Sciences
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-10-01 至 2015-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1107720&HistoricalAwards=false
• 关键词: Collaborative; Research; BEST; Synthesis; Integration

Euphausiids (krill) are a critical link connecting lower trophic levels to fish in the eastern Bering Sea, yet knowledge of euphausiid growth and vital rates is very limited. Fundamental information to address these gaps has been an important focus of the BEST-BSIERP field program, which has collected spatially explicit information on individual growth rates and grazing for several euphausiid species. Related activities are addressing broad scale age structure using new biochemical approaches for euphausiids. To make the best use of these multiple data sets, funds are provided for a focused effort to integrate and synthesize these data to estimate growth and vital rates for different regions (inner, middle, and outer shelf), and model euphausiid population dynamics to understand their demographic structure. The PIs will (1) describe spatial variations in the distribution of euphausiids in relation to different hydrographic conditions, (2) synthesize spatial variations in their demographic structure, including age and length frequency, (3) model euphausiid population dynamics and secondary production, (4) examine how predation may impact vital rates using spatial-structured statistical models, and (5) produce a comparison of life history and population dynamics of two important species: a species with broader distribution, Thysanoessa raschii, and a species primarily resident over the outer shelf, T. longipes. Results will be synthesized in the context of how the varying hydrographic conditions may impact the demographic structures of euphausiid populations by changing their growth and vital rates. Understanding how varying hydrographic conditions influence their growth and vital rates and demographic structure will lead to better understanding of how large scale changes in these conditions would influence euphausiid populations and potential impacts on higher trophic levels.The Bering Sea ecosystem provides roughly half the commercial seafood landings in the United States, as well as significant resources for subsistence fishermen. Major fluctuations in these stocks have occurred in the past and been associated with variations in the observed hydrographic conditions of the Bering Sea. The results of this project will indicate mechanisms by which the food web of the Bering Sea may be modified by such hydrographic variations.

Euphausiids（Krill）是一个关键的联系，将较低的营养水平连接到东部白令海的鱼类，但对Euphausiid生长和生命率的了解非常有限。解决这些差距的基本信息一直是Best-BSIERP现场计划的重要重点，该计划已收集了有关几种Euphausiid物种的个人增长率和放牧的空间明确信息。相关的活动是使用新的生物化学方法来解决广泛的年龄结构。为了充分利用这些多个数据集，提供了集中精力的资金，以整合和综合这些数据，以估计不同地区（内部，中间和外货架）的增长和生命率，并模拟Euphausiid人群动态，以了解其人口统计结构。 The PIs will (1) describe spatial variations in the distribution of euphausiids in relation to different hydrographic conditions, (2) synthesize spatial variations in their demographic structure, including age and length frequency, (3) model euphausiid population dynamics and secondary production, (4) examine how predation may impact vital rates using spatial-structured statistical models, and (5) produce a comparison of life history and population dynamics of two important物种：一种具有更广泛分布的物种，thysanoessa raschii和一个主要居住在外架上的物种T. longipes。结果将在不同的水文条件如何通过改变其生长和生命率来影响Euphausiid人口的人口结构的背景下合成结果。了解不同的水文条件如何影响其生长和生命率和人口统计结构将使人们更好地了解这些条件中的大规模变化将如何影响Euphausiid人群以及对更高营养水平的潜在影响。综合海洋生态系统为美国提供了一半的商业海鲜登陆，并为美国的生产渔民提供了大量资源。 这些股票的主要波动发生在过去，与观察到的白令海水文条件的变化有关。 该项目的结果将表明，这种水文变化可以修改白令海的食物网的机制。