Long‐term analysis of body condition reveals species coupling and the impacts of an invasion

Long‐term analysis of body condition reveals species coupling and the impacts of an invasion
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对身体状况的长期分析揭示了物种耦合和入侵的影响

DOI:
10.1002/ecs2.4592
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发表时间:
2023
期刊:
影响因子:
2.7
通讯作者:
Vander Zanden, M. Jake
Vander Zanden, M. Jake
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Martin, Benjamin E.;Vander Zanden, M. Jake

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捕食者-被捕食者耦合会导致捕食者-被捕食者密度的振荡。捕食者-猎物密度的振荡与种内竞争的振荡相对应,在种内竞争中,高种群密度导致高种内竞争。然而,本地物种的强耦合可能会被入侵物种引入食物网而破坏。在这里,我们调查了如何身体状况(体重相对于体长)的捕食者,湖鳟鱼,其主要猎物,思科,改变各自的人口密度转移。我们发现,湖鳟和思科的身体状况强烈影响各自的人口密度,即密度依赖性。湖鳟和思科的身体状况也呈负相关,这突出了强烈的捕食者-猎物耦合。此外,我们能够检测到最近入侵物种Bythotrephes的影响,因为我们看到入侵后猎物身体状况的大小特异性变化。总的来说,这项研究强调了一个简单的措施,身体状况的长期研究如何揭示捕食者-猎物耦合,并对入侵物种的影响产生新的见解。
Predator–prey coupling can result in oscillations of predator–prey densities. These oscillations in predator–prey densities correspond to oscillations in intraspecific competition where a high population density causes high intraspecific competition. Strong coupling of native species can however be disrupted by the introduction of invasive species into food webs. Here, we investigated how the body condition (body mass relative to body length) of a predator, lake trout, and its primary prey, cisco, changed as their respective population densities shifted. We found that the body condition of lake trout and cisco was strongly influenced by their respective population densities, that is, density dependence. The body conditions of lake trout and cisco were also inversely related, which highlights strong predator–prey coupling. Further, we were able to detect the impacts of a recent invasive species,Bythotrephes, as we saw size‐specific shifts in the body condition of prey following the invasion. Overall, this study highlights how the long‐term study of a simple measure, body condition, can reveal predator–prey coupling and yield new insights into the impacts of an invasive species.
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