Dates of observations of phenological phenomena in anurans of the Voronezh Nature Reserve

Dates of observations of seasonal phenomena in amphibians for the territory of the Voronezh Nature Reserve were obtained in the period from 1990 to 2005. Observations were carried out on permanent routes and stationary sites. We considered three phases of seasonal activity of amphibians, which can be explained in terms of thermal requirements for the advent of a phenological event: “First meeting in spring”, “Start of spawning” and “Emergence of juveniles”. The date of registration of the first sighting of an animal after leaving wintering was taken as the “First meeting in spring”. The date of the first calls of males in a water body was taken as the “Start of spawning”. The date of detection of the first individuals with completed metamorphosis was considered as the “Emergence of juveniles”.