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Elevational variation in body size of Phrynocephalus vlangalii in the North Qinghai-Xizang (Tibetan) Plateau

机译:青藏高原北部佛兰头天牛体型的身高变异

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摘要

We examined elevational and environmental aspects of body size variation in the Qinghai toad-headed lizard, Phrynocephalus vlangalii, using principal component analysis (PCA) of 9 morphological traits taken from 565 lizards from 17 populations. The first principal component (PCI) accounted for 67% of the size variation in males and 62% in females. For both males and females, PCI decreased with increasing elevation. When analyzed in relation with respect to environmental variables, body size showed positive relationship with temperature, air pressure, and activity season length, but showed weaker or inconsistent relationships with rainfall and humidity. The described pattern is the converse of Bergmann's rule for this lizard species and suggests that this body size pattern is driven by temperature, air pressure or length of the activity season.
机译:我们使用从17个种群的565只蜥蜴中提取的9种形态特征的主成分分析(PCA),研究了青海蟾蜍头蜥蜴Phrynocephalus vlangalii的体型大小变化的海拔和环境因素。第一主成分(PCI)占男性大小变异的67%,女性占62%。对于男性和女性,PCI都随着海拔的升高而下降。当根据环境变量进行分析时,体型与温度,气压和活动季节长度呈正相关,但与降雨和湿度的关系较弱或不一致。所描述的模式与该蜥蜴物种的伯格曼法则相反,并且表明该体型模式是由温度,气压或活动季节的长度驱动的。

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