Sexual selection and a secondary sexual character in two Drosophila species
Sexual selection and a secondary sexual character in two
Drosophila
species
复制标题
两种果蝇的性选择和第二性征
作者：
T. Markow;David Q. Bustoz;S. Pitnick
在两个果蝇物种的自然种群中寻找性选择对雄性体型、胸胸膜刚毛和性梳齿的数量和对称性的证据。这两个物种的交配和非交配雄性之间的体型大小没有差异。交配雄性D.与未发现交配和交配的雄性相比，拟穆兰的性梳齿明显较少。假暗纹有更多胸骨胸膜刚毛。在交配和非交配的雄性之间，没有发现任何双侧性状的波动不对称性存在差异。这些观察结果表明，体型大和对称性促进交配成功的概括是没有根据的。
Evidence of sexual selection on male body size and on the number and symmetry of sternopleural bristles and of sex comb teeth was sought in natural populations of twoDrosophilaspecies. Body size did not differ between mating and non-mating males in either species. Mating maleD. simulanshad significantly fewer sex comb teeth than did males not found copulating, and mating maleD. pseudoobscurahad more sternopleural bristles. No difference in fluctuating asymmetry of any bilateral trait was found between mating and non-mating males. These observations suggest that generalizations that large body size and symmetry promote mating success are unfounded.