Female Mate Preference for Longer Fins in Medaka
Female Mate Preference for Longer Fins in Medaka
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DOI：
10.2108/zs140102
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发表时间：
2014-11-01
影响因子：
0.9
通讯作者：
Yamahira, Kazunori
中科院分区：
文献类型：
--
作者：
Fujimoto, Shingo;Kawajiri, Maiko;Yamahira, Kazunori
青竹，宽鳍水稻复合体，在肛门和背鳍长度上表现出性别二型性，这表明雌性可能更喜欢有较长鳍的雄性。然而，女性对较长的肛门和/或背鳍的偏好尚未被描述为青竹。之前的研究没有调查这种关系的一个原因可能是，单个种群内雄性鳍长度的变化太小，无法从实验上检测到雌性的偏好。在这项研究中，我们人工杂交了两个野生种群(青森和冲绳)的个体，这两个种群的雄性肛长和背鳍长度不同，以增加表型变异。然后，我们用这些杂交雄性来测试雌性伴侣的偏好。交配实验和逐步多元回归分析的结果表明，雄性的肛鳍和/或背鳍长度有助于雌性的偏好(即，较长的肛鳍和/或背鳍的雄性不太可能被雌性拒绝)。雄性标准长度的变化不会影响雌性的喜好。在青竹物种复合体中，雌性对较长鳍的偏好的进化可以用“性感儿子”假说或直接受益假说来解释。
Medaka, Oryzias latipes complex, display sexual dimorphisms in anal-and dorsal-fin lengths that suggest that females may prefer males with longer fins. However, female preference for longer anal and/or dorsal fins has not yet been described for the medaka. One reason that previous studies have not investigated this relationship may be because variations in male fin lengths within a single population are too small to experimentally detect female preference. In this study, we artificially crossed individuals from two wild populations (Aomori and Okinawa) that differed in male anal-and dorsal-fin lengths to increase phenotypic variation. We then tested female mate preference using these hybrid males. The results of the mating experiments and stepwise multiple regression analyses indicate that anal-and/or dorsal-fin lengths of the males contributed to female preference (i.e., males with longer anal and/or dorsal fins were less likely to be rejected by females). Variation in male standard length did not affect female preference. The evolution of female preference for longer fins in the medaka species complex may be explained by the "sexy son" hypothesis or the direct benefit hypothesis.