Liczebność i rozmieszczenie stanowisk lęgowych czapli siwej Ardea cinerea w Wielkopolsce w latach 2006–2010

TL;DRAbstract

Number and distribution of the Grey Heron Ardea cinerea colonies in the Wielkopolska Province in 2006–2010. Abstract: The study describes the number and distribution of the Grey Heron in the Wielkopolska Province, gives basic data about the habitat and colony characteristics and compares current results with the previous ones. Most of the data were collected during the 2010 regional census of heronries, but it also uses data from 2006–2009. A total of 34 colonies with 1629–1650 pairs of Grey Heron were found in 2010. The average density of the species in the Wielkopolska Province was 0.9 colony and 42 nests/1000 km 2 . Over the last decades, Grey Heron population can be considered to be stable. The average colony consisted of 48 pairs (SD=43.8, median 37). Four colonies were mixed-species with the Cormorant Phalacrocorax carbo. The Grey Heron nested on 25–165 year-old trees. Most colonies (79.4%) were localized on trees younger than 80 years. The Grey Herons built their nests on 10 tre

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