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首页> 外文期刊>Canadian Journal of Zoology >Sexual dimorphism in the second-to-fourth digit length ratio in green anoles, Anolis carolinensis (Squamata: Polychrotidae), from the southeastern United States
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Sexual dimorphism in the second-to-fourth digit length ratio in green anoles, Anolis carolinensis (Squamata: Polychrotidae), from the southeastern United States

机译：来自美国东南部的绿色小圆角Anolins carolinensis（Squamata：Polychrotidae）的第二到第四位数长度比中的性二态性。

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摘要

Digit length ratios are organized during embryonic development and may show sexual dimorphism related to steroid exposure. The second-to-fourth digit length ratio (2D:4D) has received the most attention. In the present study, we measured 2D:4D of allfour feet of adult male and female green anoles (Anolis carolinensis Voigt, 1832) to determine whether it is sexually dimorphic and whether results are repeatable across laboratories. Lizards were housed at Michigan State University (MSU) and Oklahoma State University (OSU), and one investigator at each institution used digital calipers to measure the 2D:4D of each foot. At both MSU and OSU, we found that males had a significantly larger 2D:4D on the back right foot than females did, and that no sex difference existed in either the back left or the front right foot. Furthermore, although no sex difference in the front left foot was found at MSU, the 2D:4D on this foot was larger in females at OSU. Our results demonstrate both sexual dimorphism in 2D:4Dand repeatability between laboratories, but they also suggest the importance of verifying such repeatability if 2D:4D or any other digit length ratio is used as a potential indicator of the early steroid environment.
机译：在胚胎发育过程中会组织数字长度比，并且可能显示出与类固醇暴露有关的性二态性。第二到第四位数的长度比（2D：4D）受到了最多的关注。在本研究中，我们测量了成年雄性和雌性绿色小茴香（Anolis carolinensis Voigt，1832）的全部四英尺的2D：4D，以确定它是否具有性别二态性，并且结果是否在实验室之间可重复。蜥蜴分别生活在密歇根州立大学（MSU）和俄克拉荷马州立大学（OSU），每个机构的一位调查人员使用数字卡尺测量每只脚的2D：4D。在MSU和OSU中，我们发现男性右后脚的2D：4D明显大于女性，并且左后脚或右前脚没有性别差异。此外，尽管在密西根州立大学没有发现左前脚有性别差异，但在OSU中女性脚上的2D：4D较大。我们的结果证明了2D：4D的性二态性和实验室之间的可重复性，但是他们还建议，如果将2D：4D或任何其他数字长度比用作早期类固醇环境的潜在指标，则验证这种可重复性的重要性。

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