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

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”.

1990年至2005年，研究人员获取了沃罗涅日自然保护区（Voronezh Nature Reserve）范围内两栖动物季节现象的观测日期数据集。观测工作依托固定样线与固定观测站点开展。本研究针对两栖动物的季节活动选取三个阶段，各阶段均以对应物候事件出现的温度需求作为判定依据，分别为「春季首次目击」、「产卵启动」与「幼体出土」。其中，「春季首次目击」的判定时间为两栖动物离开越冬场所后首次被观测到的记录日期；「产卵启动」的判定时间为水体中首次记录到雄性个体鸣叫声的日期；「幼体出土」的判定时间为首次发现完成变态发育的幼体个体的日期。