Sexual size and shape dimorphism in two species of newts, Triturus cristatus and T-vulgaris (Caudata: Salamandridae) :

摘要: Morphometric data from Fennoscandian populations of the crested newt Triturus cristatus and smooth vulgaris were analysed for presence sexual size shape dimorphism. The sets included nine body-related head-related measurements examined with univariate, bivariate multivariate methods. Sexual dimorphism was demonstrated in both species. separation specimens highly related to sex. Although expression differed between two species, some patterns shared. These are discussed terms evolution intersexual according models ecology, fecundity selection. In analyses, restricted variables such as standard length distance extremities (with high values females), contrasting against cloaca limb-related characters males). ‘distance extremities’ measure (i.e. trunk length) one strongest sexually dimorphic traits. No evidence head morphology found. results interpreted primarily concordant theories on For example, it has been suggested that females larger volumes increase their reproductive capacity. fact males had longer extremities, relation other measured, could be attributed Long limbs male newts may beneficial courtship performance. Since did not show any dimorphism, no found suggest female have adapted different feeding strategies.