Female Barn Swallows Gain Indirect but not Direct Benefits through Social Mate Choice
Female Barn Swallows Gain Indirect but not Direct Benefits through Social Mate Choice
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DOI：
10.1111/j.1439-0310.2009.01680.x
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发表时间：
2009-10-01
期刊：
影响因子：
1.7
通讯作者：
Higuchi, Hiroyoshi
中科院分区：
文献类型：
--
作者：
Kojima, Wataru;Kitamura, Wataru;Higuchi, Hiroyoshi
女性的择偶决定了男性第二性饰品的进化。如果男性的观赏性状反映了对女性的间接、遗传和/或直接的物质利益，挑剔的女性可能会间接和/或直接从他们的选择中受益。我们研究了日本谷仓燕子的繁殖种群，以确定雄性尾流长度是否反映了对雌性的间接和/或直接好处。雄性尾流的长度与额外配对后代(Epy)的数量之间没有显著的正相关关系，这表明雄性尾流不是间接受益的信号(即好基因理论)。此外，我们没有发现任何证据表明，具有较长飘带的雄性更频繁地喂养他们的后代，或者更多地繁殖配对内的后代(WPY)。结果表明，雄性彩带长度可能不是直接受益的信号。我们的研究发现，日本燕子尾羽的长度在性别选择中没有作用，这一发现与对欧洲亚种的研究不一致，但与对北美亚种的研究一致，因为北美亚种的尾羽的性别选择很弱。这项研究支持最近的观点，即谷仓燕子尾流带长度的性别选择模式因地理而异。而不是尾长，状态较好的雄性繁殖更多的EPY和WPY。然而，状况较好的雄性并没有更频繁地给雏鸟喂食。这些结果表明，在哺育幼崽方面，雌性在选择社会伴侣方面获得了间接利益，而不是直接利益。
Female mate choice is responsible for the evolution of male secondary sexual ornaments. If male ornamental traits reflect indirect, genetic benefits and/or direct, material benefits to females, choosy females may benefit from their choice, indirectly and/or directly. We examined a breeding population of Japanese barn swallows Hirundo rustica gutturalis to determine whether male tail streamer length reflected indirect and/or direct benefits to females. There was no significant positive relationship between male streamer length and the number of extra-pair young (EPY) sired, suggesting that male tail streamers are not a signal of indirect benefits (i.e. good genes theory). In addition, we found no evidence that males with longer streamers fed their offspring more frequently or sired more within-pair young (WPY). The result indicates that male streamer length probably does not act as a signal of direct benefits. Our finding that the length of tail streamers in Japanese barn swallows plays no role in sexual selection is not consistent with studies on European subspecies, but is consistent with studies on North American subspecies where sexual selection on tail streamer is weak. The present study supports the recent suggestion that the pattern of sexual selection on tail streamer length in barn swallows varies geographically. Instead of tail length, males in better condition sired more EPY and WPY. Males in better condition, however, did not feed their nestling more frequently. These results indicate that females gain indirect benefits but not direct benefits, in terms of feeding of young, on choosing social mates.