Ivanov Gleb A. RussiaSaratovSaratov State University, 83 Astrakhanskaya Str., Saratov 410012, Russiaecoton@rambler.ru Author's articles Structure Transformation of the Anuran Amphibian Spawning Communities in Floodplain Lakes of the Medveditsa River Valley (Saratov Region) under Conditions of Long-Term Reduction of Water Content