Male-Biased Sex Ratios in Offspring of Attractive Males in the Guppy
Male-Biased Sex Ratios in Offspring of Attractive Males in the Guppy
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DOI：
10.1111/j.1439-0310.2009.01650.x
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发表时间：
2009-07-01
期刊：
影响因子：
1.7
通讯作者：
Sato, Aya
中科院分区：
文献类型：
--
作者：
Karino, Kenji;Sato, Aya
吸引力假说预测，当雌性与有吸引力的雄性交配时，其后代的性别比例会偏向雄性，因为它们的雄性后代将继承父系的性吸引力，并且可能具有较高的繁殖成功率。在这项研究中，我们研究了雄性孔雀鱼 Poecilia reticulata 的橙色斑点图案的显着性吸引力对后代性别比的影响，这是影响该物种雌性选择的重要标准。我们发现，食物控制治疗改变了一对全兄弟姐妹的橙色斑点图案的明显程度。当雌性遇到这些雄性时，它们对具有较亮橙色斑点的雄性表现出比具有较暗橙色斑点的雄性更大的择偶偏好。随后，一半的雌性与首选的雄性交配，剩下的雌性与不太受欢迎的雄性交配。当雌性对配偶表现出更大的偏好时，它们的后代性别比例更偏向雄性。这些结果似乎与吸引力假说的预测一致。在孔雀鱼中，由于雄性的性吸引力是可遗传的，有吸引力的雄性后代的雄性偏向性别比例可能是适应性的。
The attractiveness hypothesis predicts that females produce offspring with male-biased sex ratios when they mate with attractive males because their male offspring will inherit the paternal sexual attractiveness and may have high reproductive success. In this study, we examined the effect of the attractiveness of the male guppy Poecilia reticulata in terms of the conspicuousness of its orange spot patterns, important criteria affecting female choice in this species, on the offspring sex ratios. We found that food-manipulation treatment altered the conspicuousness of the orange spot patterns in a full-sibling male pair. When females were presented to these males, they showed a greater mate preference for males having brighter orange spots than for those having duller orange spots. Subsequently, half of the females were mated with the preferred males and the remaining females were mated with the less preferred males. When the females exhibited a greater preference for their mates, their offspring sex ratios were more male biased. These results appear to be consistent with the prediction of the attractiveness hypothesis. In the guppy, as male sexual attractiveness is heritable, the male-biased sex ratios of the broods of attractive males may be adaptive.