Exploring cyclic dominance of sockeye salmon with a predator–prey model

Exploring cyclic dominance of sockeye salmon with a predator–prey model
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用捕食者猎物模型探索红鲑鱼的循环优势

DOI:
10.1139/cjfas-2013-0441
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发表时间:
2014
影响因子:
2.4
通讯作者:
B Drossel
B Drossel
中科院分区:
农林科学2区
文献类型:
--
作者:
C Guill;E Carmack;B Drossel

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我们以直观和详细的方式解释了一个捕食者-被捕食者模型,该模型产生了弗雷泽河鲑鱼的循环优势。与通常的捕食者-被捕食者模型相比,该模型包括四条不同的捕食线,从而结合了连续和离散的动力学,反映了红鲑鱼种群独特的淡水和海洋生命周期特征。引起这种波动的捕食者-猎物相互作用发生在饲养的湖泊中,而不是在海洋中。该模型的大部分参数可以从弗雷泽河流域大型鲑鱼养殖湖的经验数据中估计出来。该模型中产生振荡的机制与其他产生种群振荡的机制进行了比较,我们认为捕食-被捕食动力学是最有可能产生观察到的模式的机制。我们解释了为什么振荡的周期正好是4年,并探索了外部条件的变化或管理决策如何影响动态模式。
We explain in an intuitive and detailed way a predator–prey model that generates cyclic dominance in Fraser River sockeye salmon. In contrast with usual predator–prey models, this model includes four distinct prey lines and thus a combination of continuous and discrete dynamics, reflecting the particular freshwater and marine life cycle features of sockeye salmon (Oncorhynchus nerka) populations. The predator–prey interaction causing the oscillations takes place in the rearing lakes, rather than in the ocean. The values of most parameters of this model can be estimated from empirical data that are available for the large salmon-rearing lakes in the Fraser River basin. The mechanism that produces the oscillations in this model is compared with other mechanisms that can generate population oscillations, and we argue that predator–prey dynamics is the most likely mechanism to produce the observed patterns. We explain why the period of the oscillation is exactly 4 years, and we explore how the dynamical pattern is affected by changes in external conditions or by management decisions.
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