Size-dependent predation in piscivores : interactions between predator foraging and prey avoidance abilities
Size-dependent predation in piscivores : interactions between predator foraging and prey avoidance abilities
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DOI：
10.1139/f99-058
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发表时间：
1999-07
影响因子：
2.4
通讯作者：
David Lundvall;R. Svanbäck;L. Persson;P. Byström
中科院分区：
文献类型：
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作者：
David Lundvall;R. Svanbäck;L. Persson;P. Byström
体型大小在捕食者与猎物的相互作用中起着至关重要的作用。对于一个给定的捕食者的大小，它已被建议，猎物的死亡率应该是一个圆顶形的功能依赖于猎物的身体大小。在这项研究中，我们实验测试（i）建议的机制负责圆顶形猎物脆弱性功能和（ii）是否猎物避难所影响这种功能的形式。作为猎物，我们使用了2008年的欧亚鲈鱼（Perca fluviatilis），作为捕食者，更大的欧亚鲈鱼。猎物死亡率作为猎物大小的函数是圆顶形的大型和中型捕食者，但单调下降的猎物大小的小型捕食者。捕食者的捕获成功率单调下降，增加猎物的大小，是较低的小型捕食者。在避难所试验中，猎物的死亡率单调下降与猎物的大小为所有捕食者的大小。避难所使用的猎物增加猎物和捕食者的大小。我们的研究结果表明，假设的圆顶形关系…
Body size is known to play a crucial role in predator-prey interactions. For a given predator size, it has been suggested that prey mortality should be a dome-shaped function dependent on prey body size. In this study, we experimentally tested (i) the suggested mechanisms responsible for the dome-shaped prey vulnerability function and (ii) whether a prey refuge affected the form of this function. As prey, we used young-of-the-year Eurasian perch (Perca fluviatilis), and as predator, larger Eurasian perch. The prey mortality as a function of prey size was dome shaped for large and medium predators but decreased monotonically with prey size for small predators. Capture success of predators decreased monotonically with increasing prey size and was lower for small predators. In refuge trials, the mortality of prey declined monotonically with prey size for all predator sizes. Refuge use of prey increased with the sizes of both prey and predator. Our results suggest that the hypothesized dome-shaped relationshi...