Collaborative Proposal: CAMEO: Using interdecadal comparisons to understand trade-offs between abundance and condition in fishery ecosystems

合作提案：CAMEO：利用年代际比较来了解渔业生态系统丰度和条件之间的权衡

• 批准号: 1158683
• 负责人: Jason Stockwell
• 金额: $ 3.51万
• 依托单位: University of Vermont & State Agricultural College
• 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: 2011-08-22 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1158683&HistoricalAwards=false
• 关键词: Collaborative; Proposal; CAMEO; Using; interdecadal

The investigators will conduct a model-based investigation of the dynamics of a productive pelagic ecosystems in the Gulf of Maine. The middle trophic levels in highly productive marine ecosystems are typically dominated by a few species of pelagic fish, such as sardines and anchovies in upwelling environments or herring and/or capelin in temperate and subpolar regions. These species act as important conduits for energy to higher trophic levels, including larger fish, seabirds, and cetaceans. When abundant, small pelagics can exert significant pressure on their prey, typically large mesozooplankton. Small pelagic fish exhibit complex dynamics and managing these species under an ecosystem approach is challenging. This modeling study will track both the abundance and condition of representative copepods (Calanus finmarchicus, Centropages typicus), herring, and bluefin tuna. The investigators will use a rigorous comparison of conditions from the 1980s and 1990s to develop the model. They will examine the sensitivity of this ecosystem to changes in fishing pressure on the middle trophic levels and to changes in the magnitude and timing of primary production. They will also consider the impact of increased temperature on the ability of C. finmarchicus to accumulate lipids and alter the condition of herring and tuna.The project will lead to improved knowledge of ecosystems with productive food webs. It will also directly impact address issues related to the management of the herring resource in the Gulf of Maine. The investigators will examine the consequences of ignoring condition of zooplankton and fish, as is the case with the current stock assessment. They will also explore the dynamical properties of the model ecosystem and consider under what conditions it is possible to have both abundant and well conditioned herring.

调查人员将对缅因州海湾富有成效的远洋生态系统的动态进行基于模型的调查。在高产海洋生态系统中，中等营养级通常由几种中上层鱼类占主导地位，如上升流环境中的沙丁鱼和鱼，或温带和亚极地区域的鲱鱼和/或毛鳞鱼。这些物种是将能量输送到更高营养级的重要渠道，包括大型鱼类、海鸟和鲸目动物。当数量丰富时，小型浮游生物可以对其猎物，特别是大型中型浮游动物施加巨大的压力。小型中上层鱼类具有复杂的动态，采用生态系统方法管理这些鱼种具有挑战性。这项建模研究将跟踪代表性桡足类（Calanus finmarchicus，Centropages typicus），鲱鱼和蓝鳍金枪鱼的丰度和状况。研究人员将使用20世纪80年代和90年代的条件进行严格比较来开发模型。他们将研究这一生态系统对中等营养水平捕捞压力变化以及初级生产量和时间变化的敏感性。他们还将考虑温度升高对C.该项目将有助于增进对具有生产性食物网的生态系统的了解。它还将直接影响到解决与缅因州湾鲱鱼资源管理有关的问题。调查人员将审查忽视浮游动物和鱼类状况的后果，就像目前的种群评估一样。他们还将探索模型生态系统的动力学特性，并考虑在什么条件下可能同时拥有丰富和良好的鲱鱼。