Sprawozdanie z zimowego monitoringu ptaków na obiektach wodnych Niziny Mazowieckiej w styczniu 2021 roku

In the middle of January 2021, the survey of terrestrial and waterbird species wintering on the Mazovian Lowland was conducted. The controls covered 18 rivers (in total 1220 km), the largest towns, dam reservoirs, and other smaller water bodies. The results collected on selected river sections and water bodies were submitted to a country-wide project - Wintering Water Bird Survey (MZPW). January 2021 was mild, and throughout the surveyed period the average tem- perature was around 0°C. 102268 individuals of 48 waterbird species were recorded wintering in the monitored area. The most abundant were: Mallard Anas platyrhynchos (69.8%, N = 71383), Great Cormorant Phalacrocorax carbo (6.8%, N = 6.998), Common Goldeneye Bucephala clangula (4.9%, N = 4969), Goosander Mergus merganser (2.9%, N = 2970), Greylag Goose Anser anser (2.9%, N = 2946), and the Mute Swan Cygnus olor (2.5%, N = 2552). 68 “terrestrial” bird species were recorded and their total number was 29.039 individuals. The most abundant were: Fieldfare Turdus pilaris (20.5% of the total bird number, N = 5957), Eurasian Siskin Spinus spinus (11%, N = 3201), Great Tit Parus major (7.2%, N = 2103), Western Jackdaw Corvus monedula (6.2%, N = 1807), and the Yellowhammer Emberiza citrinella (5.1%, N = 1487) – Table 2. The average bird density was 238 indiv./10 km. 120 volunteers took part in this winter bird survey.