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首页> 外文期刊>Aquatic Sciences >Indirect effects of asymmetrical competition among top predators determine spatial patterns of predation risk for prey
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Indirect effects of asymmetrical competition among top predators determine spatial patterns of predation risk for prey

机译：顶级捕食者之间不对称竞争的间接影响决定了捕食者捕食风险的空间格局

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摘要

Asymmetrical interspecific competition among top predators can indirectly affect the predation risk for their prey by altering the abundance, diet, and habitat use of inferior competitors. However, the indirect effects of such biological interactions are poorly known because of the difficulties in measuring predation risk in nature. We addressed this issue by assessing the effect of asymmetrical competition among brook trout (Salvelinus fontinalis) and two superior non-piscivorous competitors, creek chub (Semotilus atromaculatus) and white sucker (Catostomus commersonii), on the predation risk of a brook trout prey, northern redbelly dace (Chrosomus eos). We determined the spatio-temporal patterns of relative predation risk of dace with tethering experiments in 11 lakes containing either only brook trout and dace (n = 5), or brook trout, dace, chub, and sucker (n = 6). The diel pattern of the relative predation risk and the overall relative predation risk of dace were not significantly different in lakes with or without brook trout competitors. However, we observed a significant shift in the relative predation risk from the lower pelagic to the upper pelagic and littoral zones in the presence of brook trout competitors. This study highlights the fact that the outcome of interactions can vary in space and that care should be used when extrapolating the results of small-scale experiments or coarse-scale estimates to the whole ecosystem.
机译：顶级掠食者之间的不对称种间竞争可以通过改变劣等竞争者的丰度，饮食和栖息地使用来间接影响其猎物的捕食风险。然而，由于难以测量自然界中的捕食风险，因此这种生物相互作用的间接作用是鲜为人知的。我们通过评估溪鳟（Salvelinus fontinalis）与两个高级非食肉性竞争者小溪chu（Semotilus atromaculatus）和白色吮吸者（Catostomus commersonii）之间的不对称竞争对溪鳟捕食的捕食风险的影响来解决此问题，北部红腹bel（Chrosomus eos）。我们通过拴系实验在11个仅包含溪鳟鱼和dace（n = 5）或溪鳟鱼，dace，chub和sucker（n = 6）的湖泊中确定了dace相对捕食风险的时空格局。在有或没有溪鳟竞争者的湖泊中，相对捕食风险和总体相对捕食风险的迪尔模式没有显着差异。但是，我们观察到在有鳟鱼竞争者的情况下，相对捕食风险从上层下层向上层上层和滨海区显着转移。这项研究强调了这样一个事实，即相互作用的结果可能在空间中变化，并且在将小规模实验的结果或粗略估计的结果外推到整个生态系统时，应格外小心。

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  • 来源
    《Aquatic Sciences》 |2014年第4期|543-552|共10页
  • 作者

    Angelique Dupuch; Andrea Bertolo; Pierre Magnan; Lawrence M. Dill;

  • 作者单位

    Centre de recherche sur les interactions bassins versants-ecosystemes aquatiques (RIVE), Universite du Quebec a Trois-Rivieres, C.P. 500, Trois-Rivieres, QC G9A 5H7, Canada,Institut des Sciences de la Foret Temperee, Universite du Quebec en Outaouais, 58 Rue principale, Ripon, QC J0V 1V0, Canada;

    Centre de recherche sur les interactions bassins versants-ecosystemes aquatiques (RIVE), Universite du Quebec a Trois-Rivieres, C.P. 500, Trois-Rivieres, QC G9A 5H7, Canada;

    Centre de recherche sur les interactions bassins versants-ecosystemes aquatiques (RIVE), Universite du Quebec a Trois-Rivieres, C.P. 500, Trois-Rivieres, QC G9A 5H7, Canada;

    Evolutionary and Behavioural Ecology Research Group, Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Brook trout; Competition; Trophic interactions; Spatial scale; Tethering experiment;

    机译：溪鳟鱼竞争;营养相互作用;空间规模;网络共享实验;

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