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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Situation of birds in the urban environment: The example of Berlin
Auteurs :	Klaus Witt, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (121(2-3) 2000)
Article en page(s) :	107-128
Résumé :	Within the city limits of Berlin (892 km2), 149 species of breeding or possible breeding birds have been recorded between 1970 and 1997. However, only 126 of them breed every year. Trend analysis identified 28% of the species to show more or less negative trends. In order to judge the situation of birds in the city, diverse data sets are used: atlas data, censuses on plots, special surveys of single species, as well as winter censuses on constant plots (5 ha). The analysis of selected species follows a four-fold ecological subdivision of the city. The true city-species within the zone of high buildings are discussed more extensively. Negative trends are found for Collared Dove Streptopelia decaocto, Crested Lark Galerida cristata, and Jackdaw Corvus monedula, while the other species appear to be stable. Within the zone of dispersed and low construction, a few stable species have their stronghold. The adjacent zone of inner outskirts of the city, including garden areas, contains Common Redstart Phoenicurus phoenicurus with positive trend (following an earlier steep decline), whereas Rook Corvus frugilegus. Tree Sparrow Passer montanus, and Serin Serinus serinus are slightly or seriously decreasing. Within the zone of the outer outskirts most of the species of farmland, wet grassland and fallow land show negative trends. However, stability in most cases is signalled for the species of water bodies and of forests. The City is an area of high winter concentration of birds because of favourable climatic conditions and food availability for wintering. In general, extensive sealing of the ground is unfavourable for birds. However, the presence of House Sparrow Passer domesticus is highly correlated with the area of buildings. Spatial distribution of Blue and Great Tits does not depend on places with artificial food supply.

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