头部大小的性别二态性:对食物生态位分化假说的检验

IF 1.2 3区 生物学 Q2 ZOOLOGY
Wei Zhao, Nf Liu
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引用次数: 2

摘要

性别大小二态性(SSD)是蜥蜴的普遍现象,可以通过性选择或自然选择来进化。但是自然选择被认为主要是通过减少两性之间的竞争(生态位分化假说)而起作用,这引起了很多争议。通过比较雌雄蟾蜍头蜥的食性组成和猎物大小,验证了生态位分化假说。雌雄同体,雄性有较大的口鼻长度、头宽、头长和尾长,雌性有较大的腹长。根据对93个胃的分析,共鉴定出1359种猎物。最常见的猎物为甲虫、拟甲虫和拟甲虫。两性对猎物大小种类的相对摄食比例无显著差异,食性重叠率较高(O = 0.989)。此外,食物的大小,胃中最大猎物的体积或任何最大尺寸都不能用性别来解释。根据我们的研究结果,食物生态位分化可能在普氏原羚的SSD进化中没有发挥重要作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sexual Dimorphism of Head Size in Phrynocephalus przewalskii: Testing the Food Niche Divergence Hypothesis
Sexual size dimorphism (SSD) is a general phenomenon in lizards, and can evolve through sexual selection or natural selection. But natural selection, which was thought to operate mainly through reducing the competition between the two sexes (niche divergence hypothesis), gave rise to a lot of controversy. We tested the niche divergence hypothesis in the toad-headed lizard Phrynocephalus przewalskii by comparing diet composition and prey sizes between males and females. The species was found to be sexual dimorphic, with males having relatively larger snout-vent length, head width, head length, and tail length, while females have relatively larger abdomen length. Based on analysis of 93 studied stomachs, a total of 1359 prey items were identified. The most common prey items were formicid, lygaeid and tenebrionid. The two sexes did not differ in the relative proportions of prey size categories they consumed and the dietary overlap based on prey species was high (O = 0.989). In addition, the meal size, the volume or any maximal dimension of the largest prey item in the stomach was not explained by the sexes. According to our results, food niche divergence might not play an important role in the SSD evolution of P przewalskii.
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来源期刊
CiteScore
2.80
自引率
7.10%
发文量
441
审稿时长
>12 weeks
期刊介绍: AHR aims to provide a forum for herpetologists and related scientists interested in conducting international academic exchanges and joint studies, and a platform for introducing their newly made scientific and technological data, and publishing their research results and achievements in the world, but focusing on the Asian-Pacific Region. The principal criteria of AHR for acceptance of articles for publication are the quality and significance of the research, breadth of interest of the work to the readership, and the clarity and effectiveness of communication. AHR welcomes submission of manuscripts from authors in all countries of the world, though with a focus on the herpetological studies in the Asian and Pacific Region, including major articles, shorter communications and review articles.
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