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首页> 外文期刊>Journal of great lakes research >Predation risk and prey fish vertical migration in Lake Superior: Insights from an individual based model of siscowet (Salvelinus namaycush)
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Predation risk and prey fish vertical migration in Lake Superior: Insights from an individual based model of siscowet (Salvelinus namaycush)

机译：苏必利尔湖的捕食风险和猎物垂直迁移：基于个体化的粘胶（Salvelinus namaycush）模型的启示

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摘要

Drivers of movement patterns in prey fishes are often multifactorial in nature, but difficult to discern in complex lake ecosystems. Our objectives were to examine interactions between predatory siscowet lake trout and kiyi and deepwater sculpin, under different modeling scenarios to address the ramifications of prey distribution strategies on foraging by siscowet. We built an individual based model (IBM) of free moving siscowet to examine changes in predation rate on prey species given four scenarios of prey distribution. The scenarios included: 1) the nominal scenario where kiyi perform diel vertical movements (DVM) as observed in western Lake Superior; 2) a random distribution scenario where siscowet move randomly; 3) a no DVM scenario where kiyi maintain position near the bottom 24 h a day; and 4) a no DVM scenario where kiyi maintain position near 35-m 24 h a day. In the nominal scenario, there was strong agreement between simulated distribution, growth and diet of siscowets relative to observations in Lake Superior. In scenarios 3 and 4, when kiyi maintained their distribution at 35-m or near the bottom, predation rates by siscowet were approximately 14 times and 2 times higher, respectively, compared to the normal strategy exhibited by kiyi (scenario 1). These findings indicate that the present kiyi DVM strategy significantly reduces predation compared to other evaluated strategies and helps stabilize predator-prey interactions over relatively long timescales. Future analyses examining the supply and demand in the Lake Superior food web may quantify the specific importance of DVM in stabilizing predator-prey interactions.
机译：pre鱼运动方式的驱动因素通常在本质上是多因素的，但在复杂的湖泊生态系统中却难以辨别。我们的目标是在不同的建模场景下研究掠夺性的斯库加特湖鳟鱼与奇异果和深水斯库克虾之间的相互作用，以解决因斯库库特而觅食的猎物分布策略的后果。我们建立了一个自由移动的个体基础模型（IBM），以研究在四种猎物分布情况下猎物物种的捕食率变化。这些情景包括：1）在基伊西苏必利尔湖西部观察到的基伊进行迪尔垂直运动（DVM）的名义情景； 2）随机分布的场景，其中随机移动； 3）在没有DVM的情况下，kiyi一天24小时都维持在底部附近； 4）在没有DVM的情况下，kiyi每天24小时保持在35米附近。在名义上，相对于苏必利尔湖的观测结果，的模拟分布，生长和饮食之间有着很强的一致性。在方案3和4中，当kiyi保持其分布在35-m或底部附近时，与kiyi展示的正常策略相比，siscowet的掠食率分别高出约14倍和2倍（方案1）。这些发现表明，与其他评估策略相比，当前的kiyi DVM策略显着减少了捕食，并有助于在相对较长的时间范围内稳定捕食者与猎物之间的相互作用。未来分析苏必利尔湖食物网中供需关系的分析可能会量化DVM在稳定食肉动物与猎物之间的相互作用中的特定重要性。

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  • 来源
    《Journal of great lakes research》 |2014年第3期|730-738|共9页
  • 作者

    Thomas R. Hrabik; Brian M. Roth; Tyler Ahrenstorff;

  • 作者单位

    University of Minnesota, Duluth Campus, Department of Biology, 207 Swenson Science Building, 1035 Kirby Drive, Duluth, MN 55812, USA;

    Department of Fisheries and Wildlife, Michigan State University, 334 F Natural Resources Building, 293 Farm Lane, East Lansing, MI 48824, USA;

    University of Minnesota, Duluth Campus, Department of Biology, 207 Swenson Science Building, 1035 Kirby Drive, Duluth, MN 55812, USA,Minnesota Department of Natural Resources, 1601 Minnesota Drive, Brainerd, MN 56401;

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  • 正文语种 eng
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  • 关键词

    Diel vertical migration; Multifactorial ultimate causes; Siscowet; Kiyi;

    机译：迪尔垂直迁移;多因素最终原因;Siscowet;Kiyi;

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