| Titre : | Results of the German Common Birds Census, part II: population changes in German forest birds 1989-2003. |
| Auteurs : | Martin Flade, Auteur ; Johannes Schwarz, Auteur |
| Type de document : | Article |
| Dans : | Vogelwelt (Die) (125(3-4) 2004) |
| Article en page(s) : | 177-213 |
| Résumé : | The German Common Birds Census, which runs since 1989 and is based on territory mapping and point counts, provides reliable data (TRIM index curves) on the population changes of 52 German forest bird species. Despite free choice of plots and routes, only a quarter of these species shows significant differences in annual changes or overall trend of the index curves derived from the two different field methods. These differences could be successfully interpreted by analysis of sub-samples (post-hoc stratification). Concerning the annual population changes, I I partly or short-distance migrants turned out to be sensible against severe winters, most pronounced in the Wren. Negative correlations between severe winters and the population changes of the long-distance migrant Wood Warbler are probably caused by delayed growth of the ground vegetation in spring. Positive responses to severe winters in I I (optional) seed-feeding residents and partly migrants as well as four tong-distance migrants point to complex interactions between weather, forest tree seed crop, vegetation growth, insect gradations as well as competition and predation systems, which are still poorly understood. For 10 (optional) seed-feeding species in total, positive correlations between forest tree fructification and annual population changes were found. Negative correlations between forest tree seed crop and annual population changes of four species could be connected with competition relations, which can be proven for the Pied Flycatcher (nest-hole competition), which shows significant negative correlations with the annual changes of Tits and Nuthatch. Within the study period, 21 out of |
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