Homosexual behaviour increases male attractiveness to females
Homosexual behaviour increases male attractiveness to females
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DOI：
10.1098/rsbl.2012.1038
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发表时间：
2013-02-23
期刊：
影响因子：
3.3
通讯作者：
Plath, Martin
中科院分区：
文献类型：
--
作者：
Bierbach, David;Jung, Christian T.;Plath, Martin
尽管在动物王国现存的大多数进化分支中都发现了雄性同性恋行为，但这仍然是一个谜，因为同性交配会降低雄性的生殖适应性。然而，在大多数物种中，有同性性行为的雄性也会与雌性交配，从理论上讲，如果雄性提高了未来异性交配的机会，同性交配甚至可以提高雄性的生殖适应性。女性通常会利用社交信息来选择配偶；例如，在男性与女性发生性关系后，男性的吸引力会增加（配偶选择复制）。在这里，我们证明了热带淡水鱼Poecilia mexicana的雄性不仅通过异性，而且同样通过同性互动来增加对雌性的吸引力。因此，表现出同性恋行为对雄性的直接好处可能有助于解释这种行为在雌性依赖配偶选择复制作为配偶质量评估的一个组成部分的物种中的发生和持续。
Male homosexual behaviour-although found in most extant clades across the Animal Kingdom-remains a conundrum, as same-sex mating should decrease male reproductive fitness. In most species, however, males that engage in same-sex sexual behaviour also mate with females, and in theory, same-sex mating could even increase male reproductive fitness if males improve their chances of future heterosexual mating. Females regularly use social information to choose a mate; e. g. male attractiveness increases after a male has interacted sexually with a female (mate choice copying). Here, we demonstrate that males of the tropical freshwater fish Poecilia mexicana increase their attractiveness to females not only by opposite-sex, but likewise, through same-sex interactions. Hence, direct benefits for males of exhibiting homosexual behaviour may help explain its occurrence and persistence in species in which females rely on mate choice copying as one component of mate quality assessment.