Adam Dmoch, Romuald Mikusek, Andrzej Dyrcz
Ornis Polonica 2012, 53: 86–104
https://doi.org/10.12657/ornis.2012.2.1
Abstract: The avifauna of the Czerwone Bagno reserve (36 km², NE Poland), which covers swamp forests overgrowing one of the largest peatland area in Poland protected since 1925 was studied in 2007–2010. 137 species of birds were recorded, including 93 breeders and 9 species listed in the Polish Red Data Book of Animals. In case of Greater Spotted Eagle Aquila clanga (1 pair), Eurasian Eagle Owl Bubo bubo (3 pairs) and White-backed Woodpecker Dendrocopos leucotos (12–13 pairs), the number of breeding pairs exceeds 1% of the Polish population. Furthermore, the list of breeding species includes: Lesser Spotted Eagle A. pomarina (2–3 pairs), Black Grouse Tetrao tetrix (2 males at a minimum), Common Crane Grus grus (35–40 pairs), Stock Dove Columba oenas (11–12 pairs), Swift Apus apus (6 pairs at a minimum), Great Snipe Gallinago media (1 male at a minimum), Pygmy Owl Glaucidium passerinum (1 pair), Grey-headed Woodpecker Picus canus (8–9 pairs), Three-toed Woodpecker Picoides tridactylus (0–1 pair), Citrine Wagtail Motacilla citreola (1 pair) and Aquatic Warbler Acrocephalus paludicola (up to 28 males). In 2007–2008, breeding birds were censused using the cartographic method at four plots established in the habitats typical for the site. In 2 plots in the coniferous forest, total bird density was 23.9 and 24.2 pairs/10 ha. In the plot in the swamp birch forest and in bush habitat, total bird density was 21.8 and 24.7 pairs/10 ha, respectively. Low density of breeding hole-nesters (2.3–5.5 pairs/10 ha) and higher density of birds breeding on ground or low in bush (11.7–12.7 pairs/10 ha) were characterstic for the forest plots of the Czerwone Bagno reserve.
