Transformation of the phenological norm of the start date of spawning migrations of Bombina bombina and Pelophylax ridibundus (Amphibia, Anura) in the middle reach of the Medveditsa river
https://doi.org/10.35885/1684-7318-2025-3-286-299
Abstract
An analysis was carried out of the dates of the hibernation end and the beginning of spawning migrations of the fire-bellied toad and marsh frog in the valley of the middle reach of the Medveditsa river (Don basin, Saratov region) in 2023–2025. The progressive development of spring processes in the populations of these species in 2024 and their occurrence according to the false spring type in 2023 and 2025 were established. The current phenological results were compared with the retrospective time data series from 1892 to 2020 using the method of reconstructing the dynamics of the mean ten-day temperature of the environment in hibernation biotopes. The relative stability of the phenological norm of the date of the beginning of spawning migrations of the two amphibian species in the period before the onset of global warming (from 1892 to 1960) and a shift of this date to earlier dates in the period from 1961 to 2020 (by 5 days) are shown. At the end of the first quarter of the 21st century, there was a sharp acceleration of this process (a shift of 10 days relative to the current phenological norm (mean for 1991–2020)).
About the Authors
M. V. Yermokhin
Saratov State University
Russian Federation
Russian Federation
Mikhail V. Yermokhin
Faculty of Biology; Department of Animal Morphology and Ecology
410012; 83 Astrakhanskaya St.; Saratov
V. V. Tabachishin
Saratov State University
Russian Federation
Russian Federation
Vasiliy V. Tabachishin
410012; 83 Astrakhanskaya St.; Saratov
V. G. Tabachishin
Saratov Branch of A. N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences
Russian Federation
Russian Federation
Vasily G. Tabachishin
410028; 24 Rabochaya St.; Saratov
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For citations:
Yermokhin M.V., Tabachishin V.V., Tabachishin V.G. Transformation of the phenological norm of the start date of spawning migrations of Bombina bombina and Pelophylax ridibundus (Amphibia, Anura) in the middle reach of the Medveditsa river. Povolzhskiy Journal of Ecology. 2025;(3):286-299. (In Russ.) https://doi.org/10.35885/1684-7318-2025-3-286-299
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