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首页> 外文期刊>The Royal Society Proceedings B: Biological Sciences >Male sexual ornament size but not asymmetry reflects condition in stalk-eyed flies
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Male sexual ornament size but not asymmetry reflects condition in stalk-eyed flies

机译：雄性性饰物的大小但不对称反映了茎蝇的状况

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Models of sexual selection predict that females use ornament size to evaluate male condition. It has also been suggested that ornament asymmetry provides females with accurate information about condition. To test these ideas we experimentally manipulated condition in the stalk-eyed fly, Cyrtodiopsis dalmanni, by varying the amount of food available to developing larvae. Males of this species have greatly exaggerated eyestalk length and females prefer to mate with males with wider eyespans. Our experiments show that male ornaments (eyestalks) display a disproportionate sensitivity to condition compared with the homologous character in females, and to non-sexual traits (wing dimensions). In contrast, in neither sex did asymmetry reflect condition either in sexual ornaments or in non-sexual traits. We conclude that ornament size is likely to play a far greater role in sexual selection as an indicator of individual condition than does asymmetry. [References: 34]
机译：性选择模型预测女性会使用装饰品的大小来评估男性状况。还建议装饰不对称为女性提供有关状况的准确信息。为了检验这些想法，我们通过改变发育中的幼虫可用的食物量，通过实验操纵了茎蝇苍蝇（Cyrtodiopsis dalmanni）中的条件。该物种的雄性极大地夸大了眼柄的长度，雌性更喜欢与具有较宽跨度的雄性交配。我们的实验表明，与雌性的同源性和非性状（翅形）相比，雄性装饰物（眼柄）对条件的敏感性不成比例。相反，在任何性别中，不对称都不能反映性装饰品或非性特征中的状况。我们得出的结论是，作为个体状况的指标，装饰物的尺寸在性别选择中可能比不对称性发挥更大的作用。 [参考：34]

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