1. The northern hawk owl Surnia ulula invasions in Europe
- Author
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Mikkola Heimo, Rajala Esko, Väli Ülo, Keišs Oskars, Jusys Vytautas, Kwieciński Zbigniew, Dombrovski Valery, Krüger Thorsten, Hušek Jan, Pačenovský Samuel, Kuzmenko Yuriy, and Kuzmenko Tatiana
- Subjects
surnia ulula ,winter invasions ,ringing results ,european countries ,Zoology ,QL1-991 - Abstract
The northern hawk owl is a real irruptive species that respond to irregular changes in the food supply. When prey levels are adequate, it breeds and winters within northern forests. Decreased prey availability can start winter invasions, the timing and magnitude of which are the subject of this study. Mainly the citizen data were extracted from the national bird websites to obtain data on the number of northern hawk owls observed in 2010–22. This paper demonstrates that through citizen data large amounts of information can be collected over wide areas, entire Europe in this case.
- Published
- 2023
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