Sexual Dimorphism and Female Reproduction in White-striped Grass Lizard Takydromus wolteri (Lacertidae)

doi:10.11924/j.issn.1000-6850.2012-3575

Abstract

Abstract: In order to compare the geographic variation of the morphological and reproductive characteristics between different populations of Takydromus wolteri, this study was conducted between April and August, 2011 and 2012. Sexual size dimorphism (SSD) and female reproductive output of the Takydromus wolteri population from Harbin (Heilongjiang Province) were studied with the method of field capturing and laboratory feeding. Our results showed that the Harbin population of T. wolteri was in SSD and the female was significant larger than the male in snout-vent length (SVL) (F_1,62=15.337, P＜0.001). The mean SVL of females was 55.86 mm while the mean SVL of males was 52.13 mm. Females had larger abdomen length (F_1,61=4.937, P＜ 0.05) and males had larger heads (head length: F_1,61=103.56, P＜0.001; head width: F_1,61=68.524, P＜0.001) as the same SVL because larger females had a higher annual fecundity (r=0.732，F_1,18=20.821，P＜0.01) and reproductive output (r=0.681，F_1,18=15.579, P＜0.01). SSD was positively geographic variation in the T. wolteri of different population, and SVL of Harbin population in the north was obviously larger than Chuzhou population in the south in both sexes, which accorded with the Bergman’s rule.

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