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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
Sponsored by:Sichuan Society of Zoologists; Chengdu Giant Panda Breeding Research Foundation; Sichuan Association of Wildlife Conservation; Sichuan University
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Your Position :Home->Past Journals Catalog->2017 Vol.36 No.3

Sexual Dimorphism and Morphological Variation of Three Populations of Phrynocephalus helioscopus: Test of Bergmann's Rule, Allen's Rule and Rensch's Rule
Author of the article:LIANG Tao, SHI Lei*
Author's Workplace:The College of Animal Science, Xinjiang Agricultural University, Urumqi 830052, China
Key Words:Phrynocephalus helioscopus; sexual dimorphism; geographical variation; Bergmann's rule; Allen's rule; Rensch's rule; allometry
Abstract:Environmental impact of animal body size and exposed parts has been extensively studied, but its influence on sexual dimorphism is still elusive. We studied sexual dimorphism and geographical variation of morphology in 3 populations of toad-headed agama lizard (Phrynocephalus helioscopus), and combined analyses of Bergmann's rule, Allen's rule and Rensch's rule were conducted on the variation of body, limbs and tail size. The results of t-test showed that juveniles were sexually dimorphic in body size (snout-vent length, SVL) of Beitun city (P<0.05) with males having longer SVL except Yining city or Tacheng prefecture (P>0.05). Adults from Yining city and Beitun city were sexually dimorphic (P<0.05) with females having longer SVL except Tacheng prefecture (P>0.05). Analysis of covariance (ANCOVA) showed that juveniles from Beitun and Yining city did not show a sexual dimorphism in fore limb length (FLL), hind limb length (HLL) and tail length (TL) (P>0.05), while male juveniles having longer FLL from Tacheng prefecture but not in HLL or TL. Among adults, males had larger HLL and TL (P<0.01) from 3 populations, but females had larger FLL from Yining city (P<0.05) except Beitun city and Tacheng prefecture. Body size exhibited an anti-Bergmann's rule, while the size of the limbs and tail followed Allen's rule. Body size, fore limb length, hind limb length and tail length did not follow Rensch's rule from the three populations. Pressure from diffused natural selection played a stronger role than that of fecundity advantage selection and sexual selection in 3 populations of P. helioscopus.
2017,36(3): 249-257 收稿日期:2016-11-15
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