Przemysław Wylegała, Bartosz Krąkowski
Ornis Polonica 2010, 51: 107–116
https://doi.org/10.12657/ornis.2010.2.2
Abstract: In the period 2000–2009, concentrations of geese Anser sp. exceeded 1 000 individuals at about 80 sites within the region of Wielkopolska (western Poland). Among these areas, 29 roosts were used regularly. They were situated on lakes (17), fishponds (10) and dam reservoirs (2). The largest roosting ground, at the fishponds of Kiszkowo, grouped up to 30 000 Bean Geese Anser fabalis and White-fronted Geese A. albifrons in spring. The abundance of geese in Wielkopolska, both during migration and the wintering seasons, has substantially increased compared with the 1980s–1990s. It is estimated that during peak of spring migration 90–120 thousands of geese visits the region at once. Wielkopolska region is of great importance for the White-fronted Goose during spring migration, when 30–40% of the population migrating via Poland occurs in the area. A clear increase in the frequency of records of rare geese species, the Pink-footed Goose A. brachyrhynchus and Barnacle Goose Branta leucopsis in particular, has been observed. Currently, these two species are regularly noted among large flocks of geese, especially during spring migration.
