Evaluating the Effect of Atlantic Bluefin Tuna Movement on the Perception of Stock Units
Evaluating the Effect of Atlantic Bluefin Tuna Movement on the Perception of Stock Units
复制标题
评估大西洋蓝鳍金枪鱼运动对库存单位认知的影响
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
L. Kerr
中科院分区：
文献类型：
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作者：
L. Kerr
大西洋蓝鳍金枪鱼目前被分为东部和西部的单独种群管理。然而，标记，遗传，污染物和耳石化学模式表明相当大的混合。我们开发了一个模拟模型来探讨蓝鳍金枪鱼种群结构和移动对种群生产力和组成的影响。分析框架是一个随机的、年龄结构的、季节性和空间明确的重叠模型。该操作模型模拟了东部和西部产卵种群的生命速率、招募动态和移动（通过标记和耳石化学数据提供信息）。考虑了备选模型设置，包括使用不同的运动模型参数化和西部人口招募的两种流行假设。模拟的东西部种群的时空分布和相对丰度对补充制度和人口流动的假设很敏感，因为它们意味着资源的不同时空分布和暴露于不同的捕捞死亡率。模拟结果可用于确定评估和管理的研究重点，为空间显式种群评估模型的适当配置提供信息，并为评估鱼类运动背景下的备选管理方案奠定基础。
Atlantic bluefin tuna is currently managed as separate eastern and western stocks. However, tagging, genetics, contaminants, and otolith chemistry patterns indicate considerable stock mixing. We developed a simulation model to explore the consequences of bluefin tuna population structure and movement on stock productivity and composition. The analytical framework is a stochastic, age-structured, overlap model that is seasonally and spatiallyexplicit. The operating model emulates the vital rates, recruitment dynamics, and movement (informed by tagging and otolith chemistry data) of eastern and western spawning populations. Alternate model settings were considered, including using different movement model parameterizations and two prevailing assumptions of recruitment for the western population. The modeled spatial and temporal distribution and relative abundance of eastern and western populations is sensitive to assumptions of recruitment regime and population movement, because they imply different spatio-temporal distributions of the resource and exposure to different fishing mortalities. Simulation results can be used to identify research priorities for assessment and management, to inform the appropriate configurations for spatially-explicit stock assessment models, and to form the foundation for evaluating alternative management scenarios in the context of fish movement.