Abstract
The occurrence of three green frog taxa [ Rana lessonae (L), R. ridibunda (R), and R. esculenta (E)] in Nizhny Novgorod Province was evidenced by DNA flow cytometry analysis. Our data are the first reliable record of the hybrid R. esculenta for the province (the Middle Volga River basin). All hybrids were diploid. Rana lessonae is spread throughout the province, except its extreme north-east. The distribution of Rana ridibunda is wider and covers the northernmost area. Rana esculenta is quite sparse. In the province, all three species, probably, reach the northern limits of their ranges. Six population systems were revealed; both with a single species (R, L, and, probably, E) and with mixed species populations (LE, REL and RL). The geographic trends in occurrences of hybrids and various kinds of population systems in eastern Europe are discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
