In 2022 and 2023, some population characteristics of the marsh frog (Pelophylax ridibundus) were studied on the right bank of the Volga River, near the village of Somovka, Vorotynsk district, Nizhny Novgorod region. When comparing data for two different years, differences in the distribution of color phene frequencies were found, and in some cases they reached the interpopulation level.
