Nesting biology of white-tailed eagles (Haliaeetus albicilla) at the nest building stage in “Sengileevskiye gory” national park
2022
M.V. Korepov | D.A. Nikolaeva | S.A. Stryukov | P.O. Pavlov | I.P. Aryulina | M.N. Golubeva
Background. The white-tailed eagle (Haliaeetus albicilla) is a rare and vulnerablepredator of Ulyanovsk region. The article presents original materials on the nesting biologyof the species in the winter-spring period in the conditions of the breeding site, collectedon the territory of “Sengileevskiye gory” national park. Materials and methods. Tocollect the material, an autonomous video surveillance system was used, installed over aperennial nest of white-tailed eagles. The observations continued from December 13,2020 to April 24, 2021. Results. Demonstrative activity at the nest of white-tailed eaglesbegan in the third decade of January. Active nest building began in the first decade ofMarch. During the second decade of March, the birds began to imitate brooding. Themale was the most active during the nest building period. The forage diet in the winterspringperiod consists of 5 species of vertebrates, among which fish predominates. Conclusions.The male plays the key role in initiating reproduction. Demonstrative nestingbegins at the height of winter, active nest building in early spring. Imitation of incubationof clutches is most likely a manifestation of the protection of the nesting site under conditionsof intraspecific competition.
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