Tomasz Tumiel, Paweł Białomyzy, Grzegorz Grygoruk, Michał Korniluk, Piotr Świętochowski, Marcin Wereszczuk, Michał Skierczyński
Ornis Polonica 2013, 54: 170–186
https://doi.org/10.12657/ornis.2013.3.1
Abstract: Selected bird species were investigated in the SPA Knyszyn Forest (1395,9 km2, north-eastern Poland) in 2011. Population sizes were estimated with the use of survey sampling, based on 34 representative study plots 2×2 km (24 forest and 10 open landscape plots). Four daytime and two night surveys were carried out on each of forest plots, while two daytime and one night surveys were performed on open landscape plots. Apart from sampling, several species were censused. Knyszyn Forest supports important (>5%) percentages of national populations of the Hazel Grouse Tetrastes bonasia (2100–2500 p), Great Snipe Gallinago media (25–37 males), Wood Sandpiper Tringa glareola (1–2 p), Pygmy Owl Glaucidium passerinum (110–150 p), Boreal Owl Aegolius funereus (100–140 p), European Nightjar Caprimulgus europaeus (450–650 p), Three-toed Woodpecker Picoides tridactylus (49–54 p), White-backed Woodpecker Dendrocopos leucotos (25–27 p), Citrine Wagtail Motacilla citreola (4–5 p) and Greenish Warbler Phylloscopus trochiloides (18 males). Additionally, at least 1% of national population of Whooper Swan Cygnus cygnus (3–4 p), European Honey Buzzard Pernis apivorus (60–80 p), Montagu’s Harrier Circus pygargus (13–15 p), Lesser Spotted Eagle Aquila pomarina (55–60 p), Corncrake Crex crex (860–950 samców), Common Crane Grus grus (120–140 p), Grey-headed Picus canus (25–40 p), Middle Spotted D. medius (150–200 p) and Black Dryocopus martius (550–600 p) woodpeckers, Red-breasted Flycatcher Ficedula parva (800–1300 p), Black Grouse Tetrao tetrix (13 males), Common Snipe G. gallinago (380–450 p), Green Sandpiper T. ochropus (240–280 p), Stock Dove Columba oenas (300–400 p) and Redwing Turdus iliacus (5–10 p) breeds here. 156 breeding and probable breeding species have been recorded in SPA Knyszyn Forest in total, fourteen of which are red-listed in Poland.
Keywords: breeding birds, inventory, Knyszyńska Forest, sampling area, Special Protection Area
