Andrzej Dombrowski, Łukasz Nicewicz, Łukasz Trębicki, Maciej Cmoch, Łukasz Pietrasik
Ornis Polonica 2025, 66: 102-111
https://doi.org/10.12657/ornis.2025.2.2
Abstract: This paper presents the results of breeding bird surveys on two large-scale sample plots in an agriculture-forest landscape mosaic with arable land dominance in the Siedlce Upland (eastern Poland). In 2016, five counts of each selected breeding bird species were made on the ‘Trzebieszów’ plot (287 km2) and in 2017 on the ‘Przesmyki’ plot (274 km2). The densities of five bird species were similar on both plots: White Stork Ciconia ciconia – 34.7 and 35.0 p/100 km2, Montagu’s Harrier Circus pygargus – 6.9 and 6.3 p/100 km2, Lesser Spotted Eagle Clanga pomarina – 0.4 p/100 km2 each, Crane Grus grus – 10.3 and 11.9 p/100 km2, Green Sandpiper Tringa ochropus – 0.7 p/100 km2 each. Six species occurred on both plots at different densities: Honey Buzzard Pernis apivorus – 1.8 and 2.1 p/100 km2, Kestrel Falco tinnunculus – 4.4 and 5.6 p/100 km2, Marsh Harrier Circus aeruginosus – 2.8 and 4.2 p/100 km2 and Hooded Crow Corvus cornix – 4.5 and 8.4 p/100 km2, Sand Martin Riparia riparia – 134.6 and 233.6 p/100 km2 and European Bee-eater Merops apiaster – 0.3 and 1.1 p/100 km2. Against the background of the Mazovian Lowlands, the densities of the Crane, White Stork, Honey Buzzard, Common Buzzard and Common Raven were high, average for Montagu’s and Marsh Harriers, and low for the Kestrel and Hooded Crow.
Keywords: abundance, agricultural-forest landscape mosaic, breeding bird species, density, Siedlce Upland
