Competitive Displacement and Agonistic Character Displacement, or the Ghost of Interference Competition
Competitive Displacement and Agonistic Character Displacement, or the Ghost of Interference Competition
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DOI：
10.1086/728671
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发表时间：
2024-03-01
影响因子：
2.9
通讯作者：
Grether，Gregory F.
中科院分区：
文献类型：
--
作者：
Mceachin，Shawn;Drury，Jonathan P.;Grether，Gregory F.
干扰竞争可以通过生态时间内的竞争性置换和进化时间内的竞争性特征置换（ACD）来驱动物种在生境利用上的分离。根据ACD理论预测，红点豆娘（Hetaerinaspp.）在分阶段的遭遇中，它们对彼此的反应更积极，在微栖息地的使用上差异更大。然而，同样的模式可能会出现竞争性位移，如果优势物种积极排除从属物种从首选的微生境。在何种程度上造成的竞争性位移的栖息地分区可以评估与去除实验。我们进行了去除实验与三个物种对红癍豆娘。在竞争性迁移的情况下，去除优势物种应该允许从属物种转移到优势物种的微栖息地。相反，我们发现，特定物种的微栖息地使用后，实验删除持续。因此，以前记录的异种侵略和微生境分区在本属之间的关联是最有可能在过去的进化干扰竞争所造成的栖息地偏好的分歧的产物。
Interference competition can drive species apart in habitat use through competitive displacement in ecological time and agonistic character displacement (ACD) over evolutionary time. As predicted by ACD theory, sympatric species of rubyspot damselflies (Hetaerinaspp.) that respond more aggressively to each other in staged encounters differ more in microhabitat use. However, the same pattern could arise from competitive displacement if dominant species actively exclude subordinate species from preferred microhabitats. The degree to which habitat partitioning is caused by competitive displacement can be assessed with removal experiments. We carried out removal experiments with three species pairs of rubyspot damselflies. With competitive displacement, removing dominant species should allow subordinate species to shift into the dominant species’ microhabitat. Instead, we found that species-specific microhabitat use persisted after the experimental removals. Thus, the previously documented association between heterospecific aggression and microhabitat partitioning in this genus is most likely a product of divergence in habitat preferences caused by interference competition in the evolutionary past.