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<p>In 2023–2025, the analysis of dates of the end of hibernation and beginning of spawning migrations of the fire-bellied toad and marsh frog was conducted at the territory of the middle reaches of the Medveditsa River valley (Don River basin, Saratov oblast). A progressive development of spring processes in the populations of these species in 2024 and their occurrence according to a false spring type in 2023 and 2025 were established. Current phenological results were compared with a retrospective time series of data from 1892 to 2020 by a method of reconstructing the dynamics of the mean decade environmental temperature in hibernation biotopes. A relative stability of the phenological norm for dates of the beginning of spawning migrations in two amphibian species in the period before the beginning of global warming era (from 1892 to 1960), a shift of this date to earlier dates in the period from 1961 to 2020 (by 5 days) were demonstrated. At the end of the first quarter of the 21st century, there was a sharp acceleration of this process (a shift by 10 days relative to the current phenological norm (mean for 1991–2020)).</p>

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Transformation of Phenological Norm of Date of the Beginning of Spawning Migrations in Bombina bombina and Pelophylax ridibundus (Amphibia, Anura) in the Middle Reaches of the Medveditsa River

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • M. V. Yermokhin,
  • V. V. Tabachishin,
  • V. G. Tabachishin

摘要

In 2023–2025, the analysis of dates of the end of hibernation and beginning of spawning migrations of the fire-bellied toad and marsh frog was conducted at the territory of the middle reaches of the Medveditsa River valley (Don River basin, Saratov oblast). A progressive development of spring processes in the populations of these species in 2024 and their occurrence according to a false spring type in 2023 and 2025 were established. Current phenological results were compared with a retrospective time series of data from 1892 to 2020 by a method of reconstructing the dynamics of the mean decade environmental temperature in hibernation biotopes. A relative stability of the phenological norm for dates of the beginning of spawning migrations in two amphibian species in the period before the beginning of global warming era (from 1892 to 1960), a shift of this date to earlier dates in the period from 1961 to 2020 (by 5 days) were demonstrated. At the end of the first quarter of the 21st century, there was a sharp acceleration of this process (a shift by 10 days relative to the current phenological norm (mean for 1991–2020)).