Ivanov G. A. RussiaSaratovSaratov State University, 83 Astrakhanskaya Str., Saratov 410012ecoton@rambler.ru Author's articles SIZE-WEIGHT AND SEXUAL STRUCTURE OF PELOPHILAX RIDIBUNDUS AND BOMBINA BOMBINA (AMPHIBIA, ANURA) POPULATIONS IN THE FLOODPLANE OF THE MEDVEDITSA RIVER (SARATOV REGION)