Ivanov G. A. RussiaSaratovSaratov State University, 33 Astrakhanskaya Str., Saratov 410012, Russiaecoton@rambler.ru Author's articles PHENOLOGICAL CHANGES OF THE WINTERING OF PELOBATES FUSCUS (PELOBATIDAE, AMPHIBIA) IN THE CLIMATE TRANSFORMATION CONDITIONS OF THE NORTHERN LOWER-VOLGA REGION