| Titre : | Results of the German Common Birds Census. Part I: Population changes of urban breeding birds since 1989 |
| Auteurs : | Johannes Schwarz, Auteur ; Martin Flade, Auteur |
| Type de document : | Article |
| Dans : | Vogelwelt (Die) (121(2-3) 2000) |
| Article en page(s) : | 87-106 |
| Résumé : | This paper presents the first detailed analysis of data from the German Common Birds Census (DDA-Monitoringprogramm), which was initiated in 1989 to detect population changes in relatively common breeding birds. Results for 24 typical species of urban habitats are presented here. Further analyses of bird data of forests, agricultural lands, wetlands, and dry habitats will follow. For the first time the TRIM program (Statistics Netherlands) has been used for data processing. Background and ideas for statistical data analysis are described. The results are not only focussing on the overall population changes in Germany, but also on the differences between eastern and western Germany both within and outside urban habitats. Out of the 24 species analysed here, 7 species have clearly increased, (e.g. Blackcap and Blackbird) and 3 species most likely increased. On the other hand, 5 species clearly and 2 species probably have decreased - mainly species nesting on buildings. Attention has to be paid to the fact that some currently increasing species are only recovering from a long-lasting, severe decline prior to 1990. Species, which showed a stable or fluctuating population level during the study period, may do so on an extraordinarily high or low population level, respectively. In some species, e.g. Wood Pigeon, Blackbird, Blackcap and Magpie, urbanisation is still in progress. Some species show also significant differences in population changes between western and eastern Germany, for which an interpretation is sometimes not possible. |
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