Sexual Dimorphism and Reproduction in the Grass Lizard Takydromus septentrionalis

Xiang Ji, Wenhui Zhou, Xiaodong Zhang, Huiqing Gu

Abstract


Sexual dimorphism and reproduction in a population of Takydromus septentrionalis on Xiushan Island of Zhoushan Islands group were investigated during the breeding seasons of 1989 – 1992. Most males and females, approximately two years after hatchling, reached sexual maturity at 54 and 57 mm SVL, respectively. Adult male and female T. septentrionalis were similar in SVL but quite different in the head size characteristics, males having larger heads than females of similar SVL except near the size of sexual maturity. Mating success in males was apparently not related to increased SVL. Males can copulate with females in several hours before or after oviposition. The duration of intromission averaged 227 min. Females can lay 1 – 3 clutches with 2 – 6 eggs each per season. Clutch size or clutch mass was significantly correlated with SVL and was not correlated with the clutch size. Relative clutch weight (RCW) averaged 0.149. Oviposition frequency averaged 16.7 days.

Keywords


Lacertidae; Takydromus septentrionalis; sexual dimorphism; mating behavior; clutch weight; oviposition frequency

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References


Anderson R. A. and Vitt L. J. (1990), «Sexual selection versus alternative causes of sexual dimorphism in teiid lizards», Oecologia, 84, 145 – 157.

Avery R. A. (1975), «Clutch size and reproductive effort in the lizard Lacerta vivipara», Oecologia, 19, 165 – 170.

Best T. L. and Pfaffenberger G. S. (1987), «Age and sexual variation in the diet of collared lizards (Crotaphytus collaris)», Southwestern Naturalist, 32, 608 – 619.

Carothers J. H. (1984), «Sexual selection and sexual dimorphism in some herbivorous lizards», Am. Naturalist, 124, 244 – 254.

Cooper W. E., Jr. (1977), «Information analysis of agonistic behavioral sequences in the male iguanid Anolis carolinensis», Copeia, 1977, 721 – 735.

Dunham A. E. (1981), «Populations in a fluctuating environment: the comparative population ecology of Sceloporus merriami and Urosaurus ornatus», Misc. Publ. Univ. Michigan Mus. Zool., 158, 1 – 62.

Fitch H. S. (1981), «Sexual size differences in reptiles», Univ. Kansas Mus. Nat. Hist. Misc. Publ., 70, 1 – 72.

Goldberg S. R. and Robinson M. D. (1979), «Reproduction in two Namid Desert lacertid lizards (Aposaura anchietae and Meroles cuneirostris)», Herpetologica, 35, 169 – 175.

Hedrick A. V. and Temeles B. J. (1989), «The evolution of sexual dimorphism in animals: hypotheses and tests», Trend Ecol. Evol., 4, 136 – 138.

Ji X. (1992), «Storage and utilization of energy and material in eggs of two lizard species, Gekko japonicus and Takydromus septentrionalis», Comp. Biochem. Physiol., 102A, 781 -784.

Ji X., Ha W., and Wang P. C. (1989), «Studies on home range of the lizard Takydromus septentrionalis during the breeding season», J. Hangzhou Normal College, 89(6), 60 – 63 [in Chinese].

Liu C. C. (1939), «Notes on the life history and breeding habit of Takydromus septentrionalis», Peking Nat. Hist. Bull., 14(1), 35 – 42.

Powell G. L. and Russell A. P. (1985), «Growth and sexual size dimorphism in Alberta populations of the eastern short-horned lizard, Phrynosoma douglassi brevirostre», Can. J. Zool., 63, 139 – 1540.

Roughgarden J. (1974), «Niche width: biogeographic patterns among Anolis lizard populations», Am. Naturalist, 108, 429 – 442.

Sandell M. (1989), «Ecological energetics, optimal body size and sexual size dimorphism: a model applied to the stoat, Mustela erminea L»., Funct. Ecol., 3, 315 – 324.

Schoener T. W. (1967), «The ecological significance of sexual dimorphism in size in the lizard Anolis conspersus», Science, 155, 474 – 477.

Schoener T. W. (1969), «Models of optimal size for solitary predators», Am. Naturalist, 103, 277 – 313.

Schoener T. W. (1971), «Theory of feeding strategies», Ann. Rev. Ecol. Syst., 2, 369 – 404.

Schoener T. W. (1977), «Competition and niche», Biol. Reptilia, 1969(7), 35 – 136.

Telford S. R. (1969), «The ovarian cycle, reproductive potential, and structure in a population of the Japanese lizard Takydromus takydromoides», Copeia, 1969, 548 – 567.

Trivers R. L. (1972), «Parental investment and sexual selection», in: B. Campbell (ed.), Sexual Selection and the Descent of Man, 1871 – 1979, Aldine Publ. Co., Chicago.

Trivers R. L. (1976), «Sexual selection and resource-accruing abilities in Anolis garmani», Evolution, 30, 253 – 269.

Vitt L. J. (1981), «Lizard reproduction: habitat specificity and constraints on relative clutch weight», Am. Naturalist, 117, 506 – 514.

Vitt L. J. (1982), «Sexual dimorphism and reproduction in the microteiid lizard, Gymnophthalmus multiscutatus», J. Herpetol., 16, 325 – 329.

Vitt L. J. (1983), «Reproduction and sexual dimorphism in the tropical teiid lizard, Cnemidophorus ocellifer», Copeia, 1983, 359 – 365.

Vitt L. J. and Congdon J. D. (1978), «Body shape, reproductive effort, arid relative clutch weight in lizards: resolution of a paradox», Am. Naturalist, 112, 595 – 608.

Vitt L. J. and Cooper W. E., Jr. (1985), «The evolution of sexual dimorphism in the skink Eumeces laticeps: an example of sexual selection», Can. J. Zool., 63, 995 – 1002.

Vitt L. J. and Cooper W. E., Jr. (1986), «Skink reproduction and sexual dimorphism: Eumeces fasciatus in the southeastern United States, with notes on Eumeces inexpectatus», J. Herpetol., 20, 65 – 76.

Vitt L. J. and Price H. J. (1982), «Ecological and evolutionary determinants of relative clutch weight in lizards», Herpetologica, 38, 237 – 255.

Wang P. C. (1964), «Studies on ecology of four lizard species in Hangzhou. I», Chinese J. Zool., 6, 70 – 76 [in Chinese].

Wang P. C. (1966), «Studies on ecology of four lizard species in Hangzhou. II», Acta Zool. Sinica, 18, 170 – 185 [in Chinese].

Wang P. C. and Xu H. F. (1987), «Influences of ambient temperature on body temperature and heat energy metabolism of Takydromus septentrionalis», Acta Herpetol. Sinica, 6(2), 10 – 15 [in Chinese].

Wang P. C., Ji X., and Ma W. (1989), «Oxygen consumption of Takydromus septentrionalis eggs and hatchlings», in: M. Matsui, T. Hikida, and R. C. Goris (eds.), Current Herpetology in East Asia, Herpetological Society of Japan, pp. 50 – 55.


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