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PNAS:一种通过进化而赋予雄性交配优势的性状

来源:EurekAlert 2014-02-11 23:03

一项研究提示,果蝇信息素的进化很可能让雄性利用了其它雄性的预先存在的感觉偏差。动物表现出了一大批竞争配偶的性状,但是人们尚不清楚这些性特征是如何出现并且进化的。

Joanne Yew及其同事研究了一种称为CH503的信息素的进化起源,这种信息素是由雄性果蝇分泌的,在交配时转移给雌性,而后阻止了其它雄性向这些雌性求偶。这组作者发现,只有属于黑腹果蝇亚群的雄性果蝇才会分泌CH503,这提示这种信息素起源于这个亚群。然而,来自属于各种亚群的其它果蝇物种的雄性也对CH503做出反应,而且对于这种抗性欲物质敏感,尽管它们自己不制造这种信息素。

此外,CH503在黑腹果蝇亚群中抑制求偶行为的效果比其在其它类型的雄性果蝇中的效果要差,这提示产生CH503的雄性可能已经进化得对性抑制信息素不那么敏感了。综合起来,这些发现揭示了一种通过进化而赋予雄性交配优势的性状,而这一性状反过来又是如何在这些雄性中驱动了感觉适应的进化的。(生物谷Bioon.com)

生物谷推荐的英文摘要

Proceedings of the National Academy of the Sciences of the United States of America           doi: 10.1073/pnas.1313615111

Pheromone evolution and sexual behavior in Drosophila are shaped by male sensory exploitation of other males

Soon Hwee Nga, Shruti Shankara,b, Yasumasa Shikichic, Kazuaki Akasakad, Kenji Moric, and Joanne Y. Yewa,b,1

Animals exhibit a spectacular array of traits to attract mates. Understanding the evolutionary origins of sexual features and preferences is a fundamental problem in evolutionary biology, and the mechanisms remain highly controversial. In some species, females choose mates based on direct benefits conferred by the male to the female and her offspring. Thus, female preferences are thought to originate and coevolve with male traits. In contrast, sensory exploitation occurs when expression of a male trait takes advantage of preexisting sensory biases in females. Here, we document in Drosophila a previously unidentified example of sensory exploitation of males by other males through the use of the sex pheromone CH503. We use mass spectrometry, high-performance liquid chromatography, and behavioral analysis to demonstrate that an antiaphrodisiac produced by males of the melanogaster subgroup also is effective in distant Drosophila relatives that do not express the pheromone. We further show that species that produce the pheromone have become less sensitive to the compound, illustrating that sensory adaptation occurs after sensory exploitation. Our findings provide a mechanism for the origin of a sex pheromone and show that sensory exploitation changes male sexual behavior over evolutionary time.

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