| Titre : | Trends in ringing numbers of Redstarts (Phoenicurus phoenicurus) and Wrynecks (Jynx torquilla) in Southern Germany |
| Auteurs : | Wolfgang Fiedler, Auteur |
| Type de document : | Article |
| Dans : | Vogelwarte (39(4) Dec., 1998) |
| Article en page(s) : | 233-241 |
| Langues: | Allemand |
| Résumé : | In the 1960ies, the Redstart and the Wryneck showed massive population decreases in Central Europe. Under several restrictions the decline is clearly evident in the annual totals of birds ringed at the Vogelwarte Radolfzell. With respect to the use of annual ringing totals to demonstrate population trends in birds, the following general statements can be made: 1. With some statistical restrictions, annual ringing totals, as stored at ringing centres, can be used to visualize population trends in birds. 2. The results can be biased by methodological influences, not only in general ringing activity but especially in investigations focussed on a few species, in which extraordinarily large numbers of individuals are ringed. 3. The more detailed the area under consideration (on the scale of counties, large municipalities etc.), the better can methodological effects be identified. 4. Data from a particular ringing scheme should be interpreted only with detailed knowledge of the history of bird ringing activity in that scheme. It is not appropriate to use the data in any "automatic manner" within larger monitoring projects. 5. Potential inaccuracies due to changes in ringing project policy, like prohibition of ringing of extremely common species etc., cannot be compensated by correction of the totals by "ringing pressure" (the annual total of ringed individuals of all species within the ringing scheme). 6. Long-term monitoring by means of capture programs based on strictly standardized conditions cannot be replaced by using the annual ringing totals. The power of the latter lies in the much larger time period covered, since scientific bird ringing was introduced almost 100 years ago. |
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