Gniazdowanie gawrona Corvus frugilegus w powiecie sokołowskim w roku 2014
Journal Title: KULON - Year 2014, Vol 19, Issue
Abstract
In 2014, a total of 1991 active nests of the Rook Corvus frugilegus was found in the Sokołowski county (eastern Poland) on an area of 1 131 km2. Rooks nested at 8 sites comprising from 1 to 785 nests, with an average density of 176 nests/100 km2. This density was higher than in the adjacent Siedlecki county monitored in 2012. Previous local data, especially from the Bug valley within the Sokołowski county indicate a marked decline in the breeding rook population. The estimated decline in this species is at least 800-900 pairs as compared with the period of 1984-1990.
Authors and Affiliations
Andrzej Dombrowski, Łukasz Trębicki
Keywords
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