Resource limitation alters effects of phenological shifts on inter-specific competition
Resource limitation alters effects of phenological shifts on inter-specific competition
复制标题
资源限制改变了物候变化对种间竞争的影响
DOI：
10.1007/s00442-018-4214-3
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发表时间：
2018
期刊：
影响因子：
2.7
通讯作者：
McCrory, Sena
中科院分区：
文献类型：
--
作者：
Rudolf, Volker H.;McCrory, Sena
物候变化可以改变竞争物种在自然群落中的相对到达时间，但预测物种相互作用和群落动态的后果是一个重大挑战。在这里，我们表明，相对到达时间的差异可以导致可预测的优先效应，从而改变竞争互动的结果。通过实验操纵资源梯度上两个相互竞争的蝌蚪物种的相对到达时间，我们发现，推迟物种的相对到达时间可以减少物种之间的相互作用不对称性，甚至可以逆转竞争优势。然而，这些优先影响的强度取决于共享资源的丰富程度。当资源有限时，优先效应一般较弱，但在资源水平较高时，优先效应会增加。重要的是，这种背景依赖性可以用竞争对手的相对体型变化导致的人均互动强度的变化来解释。这些结果为驱动优先效应变化的机制提供了新的线索，并有助于预测不同环境中物候变化的后果。
Phenological shifts can alter the relative arrival time of competing species in natural communities, but predicting the consequences for species interactions and community dynamics is a major challenge. Here we show that differences in relative arrival time can lead to predictable priority effects that alter the outcome of competitive interactions. By experimentally manipulating the relative arrival time of two competing tadpole species across a resource gradient, we found that delaying relative arrival of a species reduced the interaction asymmetry between species and could even reverse competitive dominance. However, the strength of these priority effects was contingent on the abundance of the shared resource. Priority effects were generally weak when resources were limited, but increased at higher resource levels. Importantly, this context dependency could be explained by a shift in per capita interaction strength driven by a shift in relative body sizes of competitors. These results shed new light into the mechanisms that drive variation in priority effects and help predict consequences of phenological shifts across different environments.
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影响因子：
4.8
作者：
LAWLER, SP;MORIN, PJ
通讯作者：
MORIN, PJ
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作者：
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