Asymmetries in Mating Preferences Between Species: Female Swordtails Prefer Heterospecific Males
Asymmetries in Mating Preferences Between Species: Female Swordtails Prefer Heterospecific Males
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DOI：
10.1126/science.236.4801.595
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发表时间：
1987-05
期刊：
影响因子：
56.9
通讯作者：
M. Ryan;William E. Wagner
中科院分区：
文献类型：
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作者：
M. Ryan;William E. Wagner
在雄性剑尾鱼(剑尾鱼)中，有三个大小类别是由于Y染色体上垂体点的等位基因变异而产生的。后代分析和偏好测试表明，雌性更喜欢与体型较大的雄性交配。在近缘的侏儒X.pygmaeus中，在这个座位上没有等位基因变异；本种由大小上与较小的X.nigrensis雄性相似的雄性组成。除了比大多数雄性黑猩猩个头小之外，这些雄性侏儒还缺乏剑尾和大多数雄性黑猩猩常见的求偶表现的一个主要组成部分。通常情况下，雌性侏儒更喜欢与异种雄性交配，而不是同种交配，无论身体大小和有没有剑尾。然而，体型最小的雄性黑纹伊蚊缺乏与侏儒X.pygmaeus雄性相同的求偶成分，在这一比较中，雌性侏儒X.pygmaeus没有表现出偏爱。虽然性选择通过其对求偶表现的差异的作用，被认为是导致物种形成的一个因素，但在这种情况下，性选择可能导致异种间基因库的凝结。
In male swordtails (Xiphophorus nigrensis) there are three size classes that derive from allelic variation at the pituitary locus on the Y chromosome. Progeny analysis and preference tests suggest that females prefer to mate with larger males. In the closely related X. pygmaeus, there is no allelic variation at this locus; this species consists of males similar in size only to smaller X. nigrensis males. In addition to being smaller than most X. nigrensis males, these X.pygmaeus males also lack both the swordtail and a major component of the courtship display common in most X. nigrensis males. Usually, female X. pygmaeus prefer to mate with heterospecific males rather than conspecifics, regardless of body size and the presence of a swordtail. However, the smallest X. nigrensis males lack the same courtship component as do the X. pygmaeus males, and in this comparison female X. pygmaeus show no preference. Although sexual selection, through its action on divergence of courtship displays, has been implicated as a factor leading to speciation, in this case sexual selection could lead to the congealing of gene pools between heterospecifics.