Amphibia-Reptilia 30 (2009): 351-359 Sexual size dimorphism in relation to age and growth based on skeletochronological analysis in a Tibetan frog Xiaoyan Ma, Xin Lu * Abstract. The number of lines of arrested growth (LAGs) in diaphyseal cross-sections of phalanges or femora was used to assess individual age and growth of 612 Nanorana parkeri , including 363 males, 143 females, 70 juveniles, and 36 tadpoles, in a population from central Tibet, China. The oldest immature frogs had an age of 6 years; both the youngest sexually mature males and females were 3 years old. However, the majority of individuals bred for the first time at 5 years in males and 6 years in females. Females had greater average age (6.27 years) and lifespan (11 years) than males (5.72 and 10 years). At the population level, females, on average, were significantly larger in body length (40.3 mm) than males (37.0 mm). However, the significant size difference only occurred when both sexes were over 6 years old, at which most frogs attained maturity. Growth curve and growth rate estimated for each sex based on a von Bertalanffy model showed that females had a larger asymptotic size (54.2 mm) but smaller
Amphibia-Reptilia – Brill
Published: Jan 1, 2009
Keywords: SEXUAL SIZE DIMORPHISM; NANORANA PARKERI; SKELETOCHRONOLOGY; GROWTH; VON BERTALANFFY MODEL; AGE STRUCTURE
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