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The effects of life history and sexual selection on male and female plumage colouration

机译：生活史和性别选择对雄性和雌性羽毛着色的影响

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摘要

Classical sexual selection theory(1-4) provides a well-supported conceptual framework for understanding the evolution and signalling function of male ornaments. It predicts that males obtain greater fitness benefits than females through multiple mating because sperm are cheaper to produce than eggs. Sexual selection should therefore lead to the evolution of male-biased secondary sexual characters. However, females of many species are also highly ornamented(5-7). The view that this is due to a correlated genetic response to selection on males(1,8) was widely accepted as an explanation for female ornamentation for over 100 years(5) and current theoretical(9,10) and empirical(11-13) evidence suggests that genetic constraints can limit sex-specific trait evolution. Alternatively, female ornamentation can be the outcome of direct selection for signalling needs(7,14). Since few studies have explored interspecific patterns of both male and female elaboration, our understanding of the evolution of animal ornamentation remains incomplete, especially over broad taxonomic scales. Here we use a new method to quantify plumage colour of all similar to 6,000 species of passerine birds to determine the main evolutionary drivers of ornamental colouration in both sexes. We found that conspecific male and female colour elaboration are strongly correlated, suggesting that evolutionary changes in one sex are constrained by changes in the other sex. Both sexes are more ornamented in larger species and in species living in tropical environments. Ornamentation in females (but not males) is increased in cooperative breeders-species in which female-female competition for reproductive opportunities and other resources related to breeding may be high(6). Finally, strong sexual selection on males has antagonistic effects, causing an increase in male colouration but a considerably more pronounced reduction in female ornamentation. Our results indicate that although there may be genetic constraints to sexually independent colour evolution, both female and male ornamentation are strongly and often differentially related to morphological, social and life-history variables.
机译：经典的性选择理论（1-4）为理解男性饰品的进化和信号传递功能提供了一个有力的概念框架。它预测，通过多次交配，雄性比雌性获得更大的健身益处，因为精子比卵便宜。因此，性别选择应导致男性偏见的次要性格的演变。但是，许多物种的雌性也被高度装饰（5-7）。认为这是由于男性对选择的相关遗传反应（1,8）被100多年来解释为女性装饰的解释（5）和当前的理论（9,10）和经验性的解释（11-13） ）证据表明，遗传限制会限制性别特质的进化。另外，女性装饰可以是直接选择信号需求的结果（7，14）。由于很少有研究探讨男性和女性精细加工的种间模式，因此我们对动物装饰演变的理解仍然不完整，尤其是在广泛的分类学范围内。在这里，我们使用一种新的方法来量化所有与6,000种雀形目鸟类相似的羽毛的颜色，从而确定两性观赏性着色的主要进化驱动力。我们发现，具体的男性和女性的色彩表现密切相关，这表明一种性别的进化变化受到另一种性别变化的限制。在较大的物种和生活在热带环境中的物种中，两性都受到更多的装饰。在合作育种动物中，雌性（而非雄性）的装饰增加，在雌性中，雌性对生殖机会和与育种有关的其他资源的竞争可能很高（6）。最后，对雄性进行强烈的性选择具有拮抗作用，导致雄性色素增加，但雌性纹饰明显减少。我们的结果表明，尽管性别独立的颜色进化可能存在遗传限制，但男性和女性的装饰都与形态，社会和生活史变量密切相关且常常具有差异性。

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  • 来源
    《Nature》 |2015年第7578期|367-370|共4页
  • 作者

    Dale James; Dey Cody J.; Delhey Kaspar; Kempenaers Bart; Valcu Mihai;

  • 作者单位

    Massey Univ, Inst Nat & Math Sci, Auckland 0745, New Zealand;

    McMaster Univ, Dept Biol, Hamilton, ON L8S 4K1, Canada;

    Monash Univ, Sch Biol Sci, Clayton, Vic 3800, Australia|Max Planck Inst Ornithol, D-78315 Radolfzell am Bodensee, Germany;

    Max Planck Inst Ornithol, Dept Behav Ecol & Evolutionary Genet, D-82319 Seewiesen, Germany;

    Max Planck Inst Ornithol, Dept Behav Ecol & Evolutionary Genet, D-82319 Seewiesen, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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