Intralocus Sexual Conflict Unresolved by Sex-Limited Trait Expression
Intralocus Sexual Conflict Unresolved by Sex-Limited Trait Expression
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DOI：
10.1016/j.cub.2010.10.023
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发表时间：
2010-11-23
期刊：
影响因子：
9.2
通讯作者：
Hosken, David J.
中科院分区：
文献类型：
--
作者：
Harano, Tomohiro;Okada, Kensuke;Hosken, David J.
性别对立选择会产生灶内性冲突，这是一种雄性和雌性之间关于最佳性状值的进化拉锯战[1-4]虽然这种冲突的可能性是普遍的，但灶内冲突的进化重要性是有争议的，因为冲突通常被认为是可以通过性别特定性状发展的进化来解决的[1-8]然而，性别特异性表达是否总是解决灶内冲突尚未确定。我们对甲虫种群在夸大性选择性状上进行双向选择的情况进行了评估，下颌骨只在雄性中发育，用于雄性战斗，而更大的下颌增加了雄性的健康(战斗[9，10]和交配成功，如我们所示)我们发现，在选择较大男性下颌骨的群体中，女性的适合度较低，而在较小的下颌群体中的女性具有最高的适合度，即使女性从来不会出现夸张的下颌骨这是因为下颌骨发育改变了遗传相关的特征，导致这些群体的两性适合度负相关，这是灶内性别冲突的明确标志[1]我们的结果表明，性别受限的性状发展不需要解决灶内的性别冲突，因为性状很少(如果有的话)遗传上取决于其他特征[11]因此，灶内冲突的解决并不像现在认为的那么容易
Sexually antagonistic selection generates intralocus sexual conflict, an evolutionary tug of war between males and females over optimal trait values [1-4] Although the potential for this conflict is universal, the evolutionary importance of intralocus conflict is controversial because conflicts are typically thought to be resolvable through the evolution of sex specific trait development [1-8] However, whether sex specific trait expression always resolves intralocus conflict has not been established We assessed this with beetle populations subjected to bidirectional selection on an exaggerated sexually selected trait, the mandible Mandibles are only ever developed in males for use in male male combat, and larger mandibles increase male fitness (fighting [9, 10] and mating success, as we show here) We find that females from populations selected for larger male mandibles have lower fitness, whereas females in small mandible populations have highest fitness, even though females never develop exaggerated mandibles This is because mandible development changes genetically correlated characters, resulting in a negative intersexual fitness correlation across these populations, which is the unmistakable signature of intralocus sexual conflict [1] Our results show that sex limited trait development need not resolve intralocus sexual conflict, because traits are rarely, if ever, genetically uncle pendent of other characters [11] Hence, intralocus conflict resolution is not as easy as currently thought