Sexual size dimorphism in Rana (Pelophylax) ridibunda ridibunda Pallas, 1771 from a population in Darr-Shahr Township, Ilam Province, western Iran.

摘要

In this survey we investigated occurrence of sexual size dimorphism (SSD), in a populationof Rana (Pelophylax) ridibunda ridibunda Pallas, 1771 from Darre-Shahr Township, Ilam Province,western Iran. Ninety-six specimens (52 females and 44 males) were captured, measured andreleased into their natural habitat. Twelve metric characters were measured by digital calipers tothe nearest 0.01 mm. Statistical analyses showed considerable differences between sexes for measuredcharacters. The largest female and male were 89.55 and 73.16 mm SVL, respectively, while thesmallest female and male were 68.52 and 61.65 mm SVL, respectively. SPSS version 16 was used forrunning the analysis. The Independent-Sample t-test (2-tailed) showed that each character has significantdifferences between the sexes (p ≤ 0.01), and for each variable the female value was largerthan for males on average.