Dear enemy phenomenon in the leaf-cutting ant Acromyrmex lobicornis: behavioral and genetic evidence
Dear enemy phenomenon in the leaf-cutting ant Acromyrmex lobicornis: behavioral and genetic evidence
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DOI：
10.1093/beheco/arp190
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发表时间：
2010-03-01
影响因子：
2.4
通讯作者：
Premoli, Andrea C.
中科院分区：
文献类型：
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作者：
Dimarco, Romina D.;Farji-Brener, Alejandro G.;Premoli, Andrea C.
在动物身上，通过攻击性行为来保卫领土是众所周知的。然而，一些地域性动物物种对邻居的入侵的反应不如对非邻居的入侵那么咄咄逼人，以最大限度地减少持续战斗的代价，这种现象被称为亲爱的敌人现象(DEP)。尽管有几项研究表明这一现象的存在，但人们对其背后的机制知之甚少。一种可能的解释是，与非邻居相比，邻居之间的遗传差异程度较低。我们通过行为和遗传学研究，测试了DEP假说，以及巢间的遗传差异是否可能驱动阿根廷巴塔哥尼亚切叶蚂蚁Acromyrmex lobicorennis的DEP。与来自遥远殖民地的个体相比，来自附近殖民地的个体互动不那么咄咄逼人。然而，靠近焦点的巢和焦点非邻近的巢之间的遗传差异水平达到了相似的值。我们的结果支持亲爱的敌人假说，但表明相对于非邻居，对邻居的不同攻击性与巢间的遗传差异无关。文中还讨论了这种行为的其他可能原因，如习惯性。
The defense of territory through aggressive behavior is well known in animals. However, some territorial animal species respond less aggressively to intrusions by their neighbors than to intrusions by nonneighbors to minimize the costs of continuous fights, a phenomenon termed the dear enemy phenomenon (DEP). Although several studies show the existence of this phenomenon, little is known about the mechanism behind it. One possible explanation is the lower degree of genetic divergence between neighbors compared with nonneighbors. We tested the DEP hypothesis and whether genetic divergence among nests might drive the DEP in the leaf-cutting ant Acromyrmex lobicornis in Patagonia, Argentina, through behavioral and genetic studies. Individuals from nearby colonies interacted less aggressively than individuals from distant colonies. However, levels of genetic divergence between focal-close and between focal-nonneighbor nests attained similar values. Our results support the dear enemy hypothesis but suggest that the differential aggressiveness toward neighbors relative to nonneighbors is unrelated to genetic divergence among nests. Other possible causes of this behavior, such as habituation, are discussed.