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首页> 外文期刊>Zoological Science >Sexual Shape and Size Dimorphism in Carabid Beetles of the Genus Ceroglossus: Is Geometric Body Size Similar Between Sexes Due to Sex Ratio?
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Sexual Shape and Size Dimorphism in Carabid Beetles of the Genus Ceroglossus: Is Geometric Body Size Similar Between Sexes Due to Sex Ratio?

机译：头足类属甲虫的性形状和大小二态性：由于性别比，两性之间的几何体大小是否相似？

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摘要

Insects in many species vary greatly in the expression of secondary sexual traits, resulting in sexual dimorphism, which has been proposed to be a consequence of differences in sexual selection. In this study, we analyze the occurrence of sexual shape dimorphism and the correlation between geometric body size in males and females and sex ratio in the genus Ceroglossus (Coleoptera: Carabidae) using geometric morphometrics and randomization analysis. Our results show a positive relationship between the centroid size of males and females and sex ratio. However, we also observed a trend to maintain a "similar" body shape between sexes and species due to characteristics associated with sexual selection of the group in which the scarcity of outstanding morphological characters does not restrict reproduction capacity. The trend in sexual proportions was found to be near 1:1 for the eight species. We propose that the observed differences between sexes associated with the sex ratio are due to an energy cost caused by sexual selection; nevertheless, since proportions are similar for all the species, it is really not relevant to generate more conspicuous structures for a stronger male-male competence.
机译：在许多物种中，昆虫的次要性性状表达差异很大，导致性二态性，这被认为是性选择差异的结果。在这项研究中，我们使用几何形态计量学和随机分析方法分析了性形状二态的发生以及男女几何体大小与天牛属（鞘翅目：Carabidae）性别比之间的相关性。我们的结果表明，男性和女性的质心大小与性别比之间呈正相关。但是，由于与该群体的性选择有关的特征，我们也观察到了一种在性别与物种之间保持“相似”身体形态的趋势，其中突出的形态特征的稀缺性并不限制繁殖能力。发现这八个物种的性别比例趋势接近1：1。我们认为观察到的与性别比例有关的性别差异是由于性别选择导致的能源成本所致。但是，由于所有物种的比例都相似，因此生成更明显的结构以增强雄性和雄性能力确实无关紧要。

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