African Zoology

Log in or Register to get access to full text downloads.

Remember me or Register

DOWNLOAD FULL TEXT Open Access  DOWNLOAD FULL TEXT Subscription or Fee Access

Morphometric variation in the Tunisian green frog, Rana saharica (Anura: Ranidae)

Nabil Amor, Sarra Farjallah, Khaled Said


Rana saharica is the most widely distributed anuran in Tunisia. We examined  morphological variation in 124 specimens as a function of their geographical origin, using univariate and multivariate statistics with traditional morphometrics. Our results supported the existence of three morphotypes of this species, correctly classified 84.7% of specimens, and indicated significant degrees of variation in morphometric characteristics between regions. No significant differences were found between sexes among populations. We observed an increase in body size and a decrease in body mass as a function of latitude. Specimens from the southernmost region had the smallest body size and the greatest morphometric divergence. The pattern of morphometric variation probably results from phenotypic plasticity correlated with local environmental factors.

Key words: Rana saharica, Tunisia, morphometric variation, phenotypic plasticity.
AJOL African Journals Online