新疆敏麻蜥3个地理种群趾长及趾长比的两性异形

趾长比是指动物不同趾长的比值,常被认为是早期雄激素或雌激素暴露的标记物之一。本文通过测量新疆敏麻蜥Eremias arguta 3个地理种群的雌雄成体各趾长并计算趾长比,探究不同地理种群趾长及趾长比的两性差异。结果表明,伊犁地区雄性后肢的第2趾显著大于雌性(P<0.05);富蕴县雄性前肢、后肢的第2、3、4、5趾长均显著大于雌性(P<0.05),雌性后肢的2D∶4D显著大于雄性(P<0.05);而塔城地区雄性前肢第1、5趾和后肢第1、2、3、4趾显著大于雌性(P<0.05),雄性后肢的2D∶3D显著大于雌性(P<0.05)。3个地理种群的趾长及趾长比的两性异形没有统一模式,可能是独立进化的。敏麻蜥不同地理种群间的趾长及趾长比的两性异形有显著差异,相关机制有待进一步研究。

Sexual Dimorphism in the Digit Length and Digit Ratios Among Three Geographical Populations of Eremias arguta from Xinjiang

Digit ratios are the ratios between different toe lengths of animal.Digit ratios are often regarded as one of the markers of early androgen/estrogen exposure,which affect the morphological characteristics,behavioral performance and physiological mechanism of lizards,and are related to the fitness of lizards.In this study,by measuring the digit length and calculating the digit ratios,the sexual dimorphism of digit length and digit ratios was investigated in three geographical populations of the steppe-runners(Eremias arguta)from Xinjiang Uyghur Autonomous Region.The results showed that the adult males were significantly larger than the females in the second digit lengths of the hind limbs in Yili Basin(P<0.05),in the second,third,fourth and fifth digit lengths of the fore and hind limbs in Fuyun County(P<0.05),and in the hind second-to-fourth digit ratio(P<0.05).In the Tacheng Region,the adult males were significantly longer than the females in the first and fifth digit lengths of the fore limb and the first,second,third and fourth digit lengths of the hind limb(P<0.05);and the adult males were significantly larger than females in the hind second-to-third digit ratio(P<0.05).No uniform pattern of sexual dimorphism was detected in the digit length and digit ratios among the three geographical populations of the E.arguta,suggested that they might have evolved independently.Significant differences were detected in the sexual dimorphism of digit length and digit ratios among different geographical populations,and the mechanisms need to be further studied.