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.

磷虾（磷虾）是连接白令海东部低营养级鱼类的关键环节，但磷虾的生长和生命率的知识非常有限。基本信息，以解决这些差距一直是一个重要的焦点BEST-BSIERP领域的计划，它收集了空间上明确的个人增长率和放牧的几个磷虾物种的信息。相关的活动是解决广泛的年龄结构使用新的生化方法的磷虾。为了充分利用这些多个数据集，提供资金用于集中精力整合和综合这些数据，以估计不同地区（内，中，外大陆架）的生长和生命率，并模拟磷虾种群动态以了解其人口结构。PI将（1）描述与不同水文条件相关的磷虾分布的空间变化，（2）综合其人口结构的空间变化，包括年龄和长度频率，（3）模拟磷虾种群动态和次级生产，（4）使用空间结构统计模型研究捕食如何影响生命率，（5）比较了两个重要物种的生活史和种群动态：一个是分布较广的物种Thysanoessa raschii，另一个是主要居住在外大陆架的物种T.长脚的结果将在不同的水文条件下如何通过改变其增长率和生命率来影响磷虾种群的人口结构的背景下进行合成。了解不同的水文条件如何影响他们的增长和生命率和人口结构，将导致更好地了解如何在这些条件下大规模的变化会影响磷虾种群和潜在的影响更高的tropical level.The白令海生态系统提供了大约一半的商业海鲜登陆在美国，以及重要的资源为渔民的生计。 这些种群在过去曾发生过重大波动，并与白令海观测到的水文条件的变化有关。 该项目的结果将表明白令海的食物网可能被这种水文变化改变的机制。