Bryakova Marina A. RussiaYekaterinburgUral Federal University, 19 Mira St., Ekaterinburg 620002, Russiamarina.bryakova1996@mail.ru Author's articles Variation of age composition and postmetamorphic growth rates in Pelophylax ridibundus (Ranidae, Anura): Comparison populations from Moscow region and Kamchatka