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M. Amanat Behbahani , M. Nokhbatolfoghahai , HR Esmaeili ,

Abstract

This study describes the influences of variations in life history traits and developmental
patterns of Pelophylax ridibunda. The causes of this variation were investigated by
comparing observed patterns of interpopulational differences from geographic variables. The
aim of the study was to investigate whether embryos and larvae from different populations of
P. ridibunda show the same pattern of development when they are reared in the same
conditions in the laboratory and to find out further whether if any differences appearing in the
pattern among populations is environmentaly or geneticaly based. Egg masses
of P. ridibunda were collected from four sites in Fars Province, Iran and reared in the
same conditions. Samples from most of the developmental stages were fixed and clutch
parameters were measured at early developmental stages. Morphological characters in
embryos and larvae including egg diameter, growing size of embryos and larvae at different
stages, external gill, cement gland and mouth parts structures were examined with light and
scanning electron microscopy. Statistical analysis showed that the mean diameter of eggs and
jelly coats were significantly different (p<0.05) from each other in all four populations. In
addition, variation among sites in developmental stage at age of embryos and larvae were found. The results also showed at least three different types of dental formula, two main branches of external gill on each side, and type A cement gland developmental pattern among the populations. Our data suggest that local adaptation may be responsible for life history,
and morphometric and morphological variations among eggs, embryos and larvae of P. ridibunda. Further study is needed to quantify the relative contributions of the genotype and the environment to embryo and tadpole morphology and to assess the adaptive significance of morphological differences.

Article Details

References
How to Cite
Amanat Behbahani , M., Nokhbatolfoghahai , M., & Esmaeili , H. (2014). Intraspecific variation in Pelophylax ridibunda (Rana ridibunda) in Southern Iran: life history and developmental patterns. Iranian Journal of Animal Biosystematics, 10(1). https://doi.org/10.22067/ijab.v10i1.36787
Section
Research articles