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Census of the the crow Corvus corone cornix and magpie Pica pica in 2003 in Berlin Erfassung von Nebelkaehe Corvus corone cornix und Elster Pica pica 2003 in Berlin






Berliner Ornithologischer Bericht, 152: 129-155

Census of the the crow Corvus corone cornix and magpie Pica pica in 2003 in Berlin Erfassung von Nebelkaehe Corvus corone cornix und Elster Pica pica 2003 in Berlin

The Berliner Ornithologische Arbeitsgemeinschaft organised a census of Hooded Crow (Corvus corone cornix) and Magpie (Pica pica) in the breeding season of 2003 on sample plots in Berlin and on some adjacent areas outside the city border. 18 plots covered a total area of 110.75 km2, of which 14.73 km2 were situated outside of the city. The proposed method was mapping of occupied nests, however, for areas with difficult overview a mapping of territories was allowed. Habitats of the plots extended from densely built-up areas, extended open areas of high-rise buildings, extensive reas of single family housing, loosely built-up residential areas and parks to rural landscape including small residential areas.For urban areas (84.72 km2 built-up plus parks) mean abundances of both species were nearly identical: 6.2 terr./km2 for Hooded Crow and 5.9 terr./km2 for Magpie. However, these numbers varied considerably from plot to plot, and also with reference to the species among each other. Maximal abundances occurred for Hooded Crow in the Grosser Tiergarten (2.1 km2) with 30.2 terr./km2 and for Magpie in a built-up high-rise area with about 20 years old tree stands (Kaulsdorf North 2.6 km2) with 24.2 terr./km2. However, the predominantly rural areas at the border of the city (20.67 km2) were noticeably less populated by both species. Mean abundances were 2.4 terr./km2 for Hooded Crow and 3.1 terr./km2 for Magpie. On a purely rural area both species were missing as breeding species. According to height of nests Hooded Crow favoured higher positions than Magpie (median height 13-18 m for Hooded Crow and 7-12 m for Magpie). The use of tree species for nesting was rather variable and showed no general difference between both species for example with reference to deciduous or coniferous trees. On some of the plots, which have been censused in previous years, population dynamics differed appreciably. Whereas for the population of Hooded Crow a general increase independent of habitat is observed, an increase of the population of Magpie is much more differentiated.


Accession: 038056900



Related references

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