Size-Dependent Intraguild Predation, Cannibalism, and Resource Allocation Determine the Outcome of Species Coexistence

Size-Dependent Intraguild Predation, Cannibalism, and Resource Allocation Determine the Outcome of Species Coexistence
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大小相关的行会内捕食、同类相食和资源分配决定了物种共存的结果

DOI:
10.1086/723600
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发表时间:
2023
期刊:
The American Naturalist
影响因子:
--
通讯作者:
Travis, Joseph
Travis, Joseph
中科院分区:
--
文献类型:
--
作者:
Bassar, Ronald D.;Coulson, Tim;Travis, Joseph

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集团内捕食(IGP)是一种物种之间相互竞争资源和捕食的系统,比现有理论预测的更常见。理论上,如果IG捕食者是共享资源的较弱竞争者,并且捕食者直接从消耗猎物中受益,则IG捕食者和猎物可以共存。然而,许多IG掠食者也会吃掉自己物种的成员(同类相食)。在这里,我们要问的是,同类相食是否有助于解决IGP系统的悖论。我们的方法不同于以往的工作,IGP和食人明确考虑的捕食性相互作用的大小依赖性和捕食的好处是如何分配到生存,生长和繁殖力的捕食者或食人。我们的研究结果表明,食人促进共存的条件下,是相反的标准IGP理论预测:物种可以共存时,食人是一个更好的竞争对手的共享资源,直接受益于消费同种,并分配资源捕食更多的增长和繁殖力的生存。由于IGP和同类相食的影响是相反的,当IGP捕食者也是同类相食时,IGP捕食者和它的猎物之间的共存是不可能的,而是取决于其他共存机制的操作(例如,资源划分)。这些结果表明,了解IGP和同类相食的相对比率以及IG捕食者在确定物种共存的可能性时的资源分配策略的重要性。
Intraguild predation (IGP), a system in which species compete for resources and prey on each other, is more common than existing theory predicts. In theory, an IG predator and its prey can coexist if the IG predator is a weaker competitor for a shared resource and the predator directly benefits from consuming the prey. However, many species that are IG predators also consume members of their own species (cannibalism). Here, we ask whether cannibalism can help resolve the paradox of IGP systems. Our approach differs from previous work on IGP and cannibalism by explicitly considering the size dependence of predatory interactions and how the benefits of predation are allocated to survival, growth, and fecundity of the predator or cannibal. Our results show that cannibalism facilitates coexistence under conditions that are opposite of those predicted by standard IGP theory: species can coexist when the cannibal is a better competitor on the shared resources, directly benefits little from consuming conspecifics, and allocates resources from predation more toward growth and fecundity over survival. Because the effects of IGP and cannibalism are opposite, when an IGP predator is also a cannibal, coexistence between the IGP predator and its prey is not possible and instead depends on the operation of other coexistence mechanisms (e.g., resource partitioning). These results point to the importance of understanding the relative rates of IGP and cannibalism as well as the resource allocation strategy of the IG predator in determining the likelihood of species coexistence.
预测具有连续个体发生生态位转移和竞争不对称的物种共存
DOI: 10.1101/119446
发表时间: 2017
期刊: bioRxiv
影响因子: --
作者:
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特立尼达孔雀鱼的竞争不对称和局部适应
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影响因子: 4.8
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发表时间: 2008
期刊: The American Naturalist
影响因子: --
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DOI: --
发表时间: 2012
影响因子: 2.9
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