State-dependent energy allocation in cod (Gadus morhua)
State-dependent energy allocation in cod (Gadus morhua)
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DOI：
10.1139/f05-209
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发表时间：
2006-01-01
影响因子：
2.4
通讯作者：
Fiksen, O
中科院分区：
文献类型：
--
作者：
Jorgensen, C;Fiksen, O
生长和成熟是适应个体可能经历的外部环境的过程，其中食物供应、死亡率和完成生命周期所需的事件特别重要。了解影响生活史策略的因素以及生活史的变化如何影响种群动态和生态相互作用对于我们理解海洋生态和当代人为引起的变化至关重要。我们提出了一种状态依赖模型，可以优化迭代产鱼的终生能量分配。能量可以分配给生长或繁殖，取决于个体的年龄、体长、储存的能量和环境状况。生长、能量储存和繁殖的分配和生理过程是机械建模的。该模型针对大西洋鳕鱼（Gadus morhua），更具体地说是东北北极鳕鱼种群进行了参数化。该模型预测的生长和成熟与现场观察非常吻合，并且基于对模型中鳕鱼繁殖的进一步研究，我们得出结论，该模型具有重新捕捉复杂生活史现象的能力，例如不确定生长和跳过产卵，因此为提高我们对鱼类生活史策略的理解提供了重要工具。
Growth and maturation are processes that are tuned to the external environment that an individual is likely to experience, where food availability, the mortality regime, and events necessary to complete the life cycle are of special importance. Understanding what influences life history strategies and how changes in life history in turn influence population dynamics and ecological interactions are crucial to our understanding of marine ecology and contemporary anthropogenic induced change. We present a state-dependent model that optimises life-long energy allocation in iteroparous fish. Energy can be allocated to growth or reproduction and depends in the individual's age, body length, and stored energy and the state of the environment. Allocation and the physiological processes of growth, energy storage, and reproduction are modelled mechanistically. The model is parameterised for Atlantic cod (Gadus morhua), more specifically the Northeast Arctic cod stock. Growth and maturation predicted by the model fit well with field observations, and based on a further investigation of cod reproduction in the model, we conclude that the model has the ability to recapture complex life history phenomena, e.g., indeterminate growth and skipped spawning, and therefore provides an important tool that can improve our understanding of life history strategies in fish.