Rozmieszczenie i liczebność kolonii lęgowych gawrona Corvus frugilegus w powiecie wołomińskim w latach 2012-2013
Journal Title: KULON - Year 2014, Vol 19, Issue
Abstract
Field research was carried out in Wołomin County in late April and early May 2012-2013. In 2012, a total of 1322 nest in 26 breeding colonies were located, and in 2013, it was 1151 nests in 23 rookeries. In sum, the number of different locations was 27. Colonies of up to 50 nests accounted for ca 73%. All were located in the vicinity to human settlements. Rookeries were unevenly distributed, but there was a linear connection between them. In both years, urban colonies accounted for ca 50%, but they comprised less than 20% of all breeding pairs. The mean density of the breeding population was 139 pairs/100 km2 in 2012 and 121 pairs/100 km2 in 2013. Nest trees represented 16 genera. Most nests were built in pines, birches and poplars. There was no preference for the tree genus. This paper demonstrates the need to continue the fieldwork in the study area, as well as to standardize the methods of assessing the number of rooks in the whole country.
Authors and Affiliations
Justyna Lewandowska
Keywords
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