| Titre : | Raptor migration at Falsterbo, Sweden |
| Auteurs : | Nils Kjellen, Auteur |
| Type de document : | Article |
| Dans : | Dansk Ornitologisk Forenings Tidsskrift (92(4) 1998) |
| Article en page(s) : | 317-326 |
| Langues: | Anglais |
| Résumé : | During the years 1986-1997 the raptor migration over the Falsterbo peninsula was counted during the period from 1 August until 20 November. All birds were aged and sexed as far as possible. The overall seasonal timing ad total proportions of different age classes were estimated for each species on the basis of the sample of identified individuals (with respect to age), weighted by the total number of individuals during ten-day periods. For example, if 20% of the identified Buzzards in the last ten-day period of September during one year were juveniles, 20% of the unidentified Buzzards during this period were also assumed to be juveniles and the rest adults. The annual totals and the proportion of unaged birds are given. Systematic autumn counts of migrating birds at Falsterbo have bee conducted since 1973. The correlation of annual numbers in this study with the standardized counts was significant in all secies, although the average figures were between 38% and 214% higher in this study due to a better coverage. Most speies have been stable or inceasing durin ecet years. Long-term population increases in Red Kite, Marsh Harrier and Peregrine were very well reflected by the counts. A recent decrease in migrating Rough-legged Buzzards could be attributed to lower numbers of adult migrants. Numbers of migrating Buzzards at Falsterbo were relatively stable compared to increasing figures at Hellebaek, north of Helsingor in Denmark. Standardized migration counts at Falsterbo are presently the best way to follow long-time changes in the Swedish raptor populations. |
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