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: 1107731
• 负责人: Rodger Harvey
• 金额: $ 14.57万
• 依托单位: Old Dominion University Research Foundation
• 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 2014-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1107731&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）是连接白令海东部较低营养级和鱼类的关键环节，但对磷虾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 实地计划的一个重要重点，该计划收集了有关几种磷虾物种的个体生长率和放牧的空间明确信息。相关活动正在利用新的磷虾生物化学方法来解决大范围的年龄结构问题。为了充分利用这些多个数据集，我们提供资金集中精力整合和综合这些数据，以估计不同区域（内陆架、中陆架和外架）的生长和生命率，并对磷虾种群动态进行建模以了解他们的人口结构。 PI将(1)描述与不同水文条件有关的磷虾分布的空间变化，(2)综合其种群结构的空间变化，包括年龄和身长频率，(3)模拟磷虾种群动态和二次生产，( 4）使用空间结构统计模型研究捕食如何影响生命率，以及（5）对两个重要物种的生活史和种群动态进行比较：分布更广泛的物种，Thysanoessa raschii，以及主要居住在外大陆架的物种 T. longipes。结果将在不同的水文条件如何通过改变磷虾种群的生长和生命率来影响磷虾种群的人口结构的背景下进行综合。了解不同的水文条件如何影响它们的生长和生命率以及人口结构，将有助于更好地了解这些条件的大规模变化将如何影响磷虾种群以及对更高营养级的潜在影响。白令海生态系统提供了大约一半的商业海鲜上岸量在美国，以及为自给渔民提供大量资源。 这些种群的重大波动在过去曾发生过，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食物网可能因水文地理变化而改变的机制。