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.

研究人员将对缅因州海湾生产性上层生态系统的动力学进行基于模型的研究。高生产力海洋生态系统中的中间营养水平通常由几种上层鱼类，例如在上升环境中的沙丁鱼和凤尾鱼，或温带和亚极区域的鲱鱼和/或Capelin。这些物种是对较高营养水平的能量的重要渠道，包括较大的鱼类，海鸟和鲸类。当丰富的小体层时，小体质会给猎物施加巨大的压力，通常是大型中龙兰克顿。小质鱼在生态系统方法下表现出复杂的动力学，并管理这些物种是具有挑战性的。这项建模研究将跟踪代表性copepods（Calanus finmarchicus，Centropages Typicus），鲱鱼和蓝鳍金枪鱼的丰度和状况。研究人员将对1980年代和1990年代的条件进行严格的比较来开发该模型。他们将研究该生态系统对中间营养水平的捕捞压力变化以及初级生产的幅度和时机的变化的敏感性。他们还将考虑温度提高对芬马那菌积累脂质和改变鲱鱼和金枪鱼状况的能力的影响。该项目将通过生产性食品网提高对生态系统的知识。它还将直接影响与缅因州海湾鲱鱼资源管理有关的问题问题。研究人员将检查忽略浮游动物和鱼类状况的后果，就像当前的库存评估一样。他们还将探索模型生态系统的动力学特性，并在哪种条件下考虑具有丰富且条件良好的鲱鱼。