Vershinin Vladimir L. RussiaEkaterinburgInstitute of Plant and Animal Ecology of Ural Branch of the Russian Academy of Sciences, 202 8th March St., Ekaterinburg 620144, Russiavol_de_mar@list.ru Author's articles Svetlana Dmitrievna Vershinina (1961–2021): Her life and contribution to herpetology Influence of the geochemical background of the Western Caspian region of Azerbaijan on acid-base balance regulation of Pelophylax ridibundus (Pallas, 1771) (Amphibia, Ranidae) blood