Survival and some physiological responses to freezing were investigated in three European water frogs (Rana lessonae, Rana ridibunda, and their hybridogen Rana esculenta). The three species exhibited different survival times during freezing (from 10 h for R. lessonae to 20 h for R. ridibunda). The time courses of percent water frozen were similar; however, because of the huge differences in bod...

In this study, two mountain frogs (Rana camerani and Rana macrocnemis) were collected in the Antalya Province in south-western Turkey during 2001 and 2002 and were examined for helminths. Out of 15 Rana camerani, 10 (66.7%) were infected with 1 or more helminths and out of 20 Rana macrocnemis, 17 (85%) were infected with 1 or more helminths. The helminth fauna of Rana camerani included 4 specie...

immune genes of the major histocompatibility complex (mhc) are among the most polymorphic genes in the vertebrate genome. due to their polymorphic nature, they are often used to assess the adaptive genetic variability of natural populations. this study describes the first molecular characterization of 13 partial mhc class iib sequences from three european ranid frogs.  the utility of previously...

Fourteen adult frogs including six banded frog, Rana camerani and eight marsh frog, Rana ridibunda ridibunda were collected from two sites of Chahar Mahal-o-Bakhtiari province at the southwest of Iran and then were examined for helminth parasites. Only Dolichosaccus rastellus  (50%) was found in R. camerani, Skrjabinoeces similis (50%) and metacercarian cysts of Codonocephalus urniger (12....

Mitochondrial DNA sequence data from the control region and 12S rRNA in leopard frogs from the Sierra El Aguaje of southern Sonora, Mexico, together with GenBank sequences, were used to infer taxonomic identity and provide phylogenetic hypotheses for relationships with other members of the Rana pipiens complex. We show that frogs from the Sierra El Aguaje belong to the Rana berlandieri subgroup...

Experiments are described in which eggs of Rana species were treated prior to insemination with antisera prepared against oviducal materials of Rana, Bufo, and Ambystoma species. Three types of treatment with antisera were employed. Eggs of Rana pipiens and R. clamitans were treated with antisera against materials prepared from whole oviducts, or from upper and lower segments of oviducts, of R....