Intraspecific variation in Pelophylax ridibunda (Rana ridibunda) in Southern Iran: life history and developmental patterns

Document Type : Research articles



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