Zgrupowania lęgowe ptaków zasiedlających stawy rybne w Wildze w roku 1981 i 2014
Journal Title: KULON - Year 2015, Vol 20, Issue
Abstract
In 1981 and 2014, breeding birds were monitored on fish ponds at Wilga (120 ha) in the middle Vistula valley (Mazovian Province). Using the modified version of the mapping method, eight surveys were conducted and numbers of all breeding species were estimated in areas between dikes. In 1981 and 2014, 36 and 29 nesting species were recorded, respectively, and 41 species in the two seasons combined. Numbers of breeding pairs were 1970 (470 without the Black-headed Gull Chroicocephalus ridibundus) and 210 in the two seasons, respectively. The density declined from 1641.7 pairs/100 ha (391.7 without the Black-headed Gull) in 1981 to 175 pairs/100 ha in 2014. After 33 years, 12 bird species did not nest and numbers of 14 species declined. At the same time, 5 new species arrived, and 6 species increased. The decline may be attributed to anthropogenic factors and predation by the American mink Neovison vison.
Authors and Affiliations
Andrzej Dombrowski, Marcin Łukaszewicz
Keywords
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