Home – Home – Jornals – Contemporary Problems of Ecology 2025 number 5

In the third decade of the XXI century in St. Petersburg, phenological anomalies are most pronounced in the “Spring Revival” sub-season, both of its phenomena began to occur at a significantly early date, with great anticipation. At the same time, gray alder began to bloom especially early, as an indicator of the first stage of the “Spring Revival” sub-season. The second most powerful anomaly occurs at the second stage of the “Beginning of Summer” subseason and lasts almost until the end of the calendar year, including the “Pre-winter”. At the same time, the summer phenomena are ahead of schedule, and from the “Beginning of Autumn” sub-season, the phenodates abruptly change their sign to the opposite. All the phenological stages and sub-seasons of autumn began to occur at a late date. For the first time, in some years, the “Beginning of Autumn” sub-season came later by 12 days (2022) and 18 days (2024), and the second stage of the “Beginning of Autumn” sub-season in 2024 began 16 days later than the norm of the climate of the 30th anniversary of 1980-2009. The duration of the “Winter” season decreased by 2021-2024 by 9 days, and the summer season increased by 11 days. In the context of ongoing and increasing climate warming, the importance of phenological observations and the need for continuous monitoring are increasing. The role of botanical gardens as biodiversity conservation centers is increasing.