| Titre : | Stopover characteristics of Sedge Warblers (Acrocephalus schoenobaenus) in central Iberia |
| Auteurs : | Ana Bermejo, Auteur ; Javier de la Puente, Auteur |
| Type de document : | Article |
| Dans : | Vogelwarte (41(3) September, 2002) |
| Article en page(s) : | 181-189 |
| Langues: | Allemand |
| Résumé : | The Sedge Warbler (Acrocephalus schoenobaenus) is a long-distance Palearctic migrant, whose western European population reportedly makes a non-stop flight from England or northern France across the Mediterranean and the Sahara desert. We found, however, that a small part of this population makes a stopover in Iberia. By analysing the intensity and timing of migration of Sedge Warblers in both the pre- and post-breeding passages in a reedbed in central Spain during 1995-1999, we found a regular across-years influx of migrant Sedge Warblers settling in the study area. Mainly Dutch, British, and in lower proportions other western European populations, used the reedbed as a stopover area and showed a certain degree of migratory site fidelity. The timing of migration was in accordance to that expected according to latitude of the area and previously published data, and was roughly coincident with predictions of evolutionary theory about warbler migration. Peak spring passage occurred in the last two weeks of April, while the autumn one took place during the last two weeks of July and the first two weeks of August. The spring passage was shorter and of lower intensity than the autumn one. Juveniles passed slower, less concentrated in time and slightly later than did adults. The annual ratio of yearlings to adult birds was about 1:1, and closely matched that obtained by the "Constant Effort Sites" Project for the breeding British Sedge Warbler population. Therefore, part of the interannual variation in age ratios in the autumn passage at this site may be explained by variable across-years breeding success of British populations. |
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