ЩОДО ЧИСЕЛЬНОСТІ МАРТИНА ЗВИЧАЙНОГО CHROICOCEPHALUS RIDIBUNDUS НА ВОДООЧИСНИХ СПОРУДАХ ХАРКІВСЬКОЇ ОБЛАСТІ

The black-headed gull (Chroicocephalus ridibundus) nests on the sludge sites of the Kharkiv sewage treatment plants and on Novyi Lyman Lake. The attractiveness of the territory for birds is determined by the abundant food supply and safety of nesting sites. Arrival in spring was recorded: 11.03.2020, 20.03.2021, 9.03.2023. In 2020, the maximum number of birds was recorded in late May (2637 individuals), and then the number of individuals decreased. In 2021, the highest number of birds was observed in mid May (3949 individuals), and the lowest number in late April (3778 individuals). In 2023, the highest number of birds was recorded in late May (2124 individuals).