Przemysław Wylegała
Ornis Polonica 2019, 60: 211–220
https://doi.org/10.12657/ornis.2019.3.3
Abstract: This paper presents the numbers of 5 waterbird species counted in the Gwda river and its tributaries (the Piława, Plitnica, Rurzyca, Głomia) of the total length of 214 km. The rivers flow through forested areas. The slope of their beds ranges from 0.30 to 1.54‰. In 2019 within the whole surveyed area we found 33–40 pairs of Goldeneyes Bucephala clangula (1% of the national population), 24–30 pairs of Common Mergansers Mergus merganser (1–2% of the national population), 49 pairs of Common Kingfishers Alcedo atthis (0.8–2.0% of the national population), 83–89 pairs of Grey Wagtails Motacilla cinerea (0.9–1.3% of Polish population) and about 1025 pairs of Bank Swallows Riparia riparia (0.3–0.7% of the national population). The Gwda basin plays an important role for the five studied species at the national scale. The density of Bank Swallows was the highest among the ones reported so far from the natural habitats of the Odra basin.
Keywords: breeding birds, catchment area of the Noteć river, SPA Forest at Gwda River, waterbirds
