| Titre : | Population size, breeding success and annual survival of small birds - Results of Constant Effort Site ringing in Germany, 1998-2013 (2016) |
| Auteurs : | Bert Meister, Auteur ; Ulrich Köppen, Auteur ; Olaf Geiter, Auteur ; Wolfgang Fiedler, Auteur ; Franz Bairlein, Auteur |
| Type de document : | Article |
| Dans : | Vogelwarte (54(2) 2016) |
| Article en page(s) : | 90–108 |
| Langues: | Allemand |
| Résumé : | Since the mid 1990s the three German Vogelwarten operate a Constant Effort Ringing Scheme (“Integriertes Monitoring von Singvogelpopulationen; IMS”) aiming to obtain besides population indices productivity indices and estimates of survival rates. From 1998 until 2013 74 sites were operated. The sites aren’t distributed uniformely across Germany, clustering in Saxony and Saxony-Anhalt. The work was carried out mainly by volunteers of the three Vogelwarten. 14 out of the 42 investigated species were significant declining in breeding numbers, six species were increasing. Six species were significantly declining in breeding success while not a single one increased breeding success over the study period. 16 species have had suffcient data for the estimation of trends in annual survival. Marsh and Reed Warbler significantly declined in survival while all the other species did not reveal significant changes in survival rates. Population indices of residents and short/medium- and long-distance migrants, respectively, did not show significantly different trends but productivity indices declined significantly in short- und long-distance migrants. In addition, estimates of annual survival rates declined significantly in long-distance migrants but not so in the other groups. For most species the trends in population indices tended to be more positive in eastern Germany than in western Germany. In contrast, the trend in productivity was more positive in western Germany. The present analysis shows that the IMS with its indices of productivity and and annual survival can contribute to a more profound understanding of the population dynamics of German breeding birds. |
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