Distribution «Western» and «Eastern» forms of marsh frog Pelophylax ridibundus s. l. in the Samara and Saratov region (on data of analysis of mtDNA and NDNA)

Molecular-genetic analysis of 71 specimen of marsh frog from 21 locality in Samara and Saratov regions and adjacent areas was made. It was established, that in the study area there are two genetically differentiated forms of marsh frogs - "eastern" and "western". Mismatch of frequencies of alleles of mitochondrial and nuclear DNA was revealed - most of the marsh frogs have nuclear DNA of "western" form and mitochondrial DNA of "eastern" form. The features of the geographical distribution of cryptic forms and their biotopic confinement were studied.