东方蝾螈性二型性特征分析

Sexual Size Dimorphism and Character Scaling of Cynops orientalis

以东方蝾螈大别山种群为实验材料,随机选取162只蝾螈(雄52只,雌110只),通过单变量、双变量、多变量分析的方法,进行11项体征的测量分析。结果表明,头体长是本研究的最适单变量,且头体长与腋胯距之间的相关性最高;PC1在雄性和雌性中均与头体长密切相关,且大多数体征与头体长进行比例分析均显示出异速生长关系,东方蝾螈性二型性普遍存在。本研究中11项体征呈现符合Rensch法则的雌性依赖性二型性演化特征,这种性二型性特征可能是一系列复杂的非对称性选择的结果。

Morphometric data of Chinese fire-bellied newts Cynops orientalis（n=162,52 males and 110 females） population from Dabie Mountain were analyzed for the presence of sexual size and shape dimorphism.The data sets included eleven body-related measurements and were examined with univariate,bivariate and multivariate methods.The snout-vent length（SVL） was found to be the best univariate measure of overall body size.And the correlration between SVL and axilla-groin distance（AGD） is the highest;the result of principal component analysis shows that PC1 is closely related to SVL both in males and females.Scaling of body characters against SVL indicated allometry for most characters between sexes.With respect to size and shape,we found a significant female-biased dimorphism in the Chinese fire-bellied newts in accordance with Rensch＇s rule.The evolution of female-biased SSD may be driven by a more diverse and complex range of asymmetric selective processes.