| Titre : | A colourful invasion sustained - Breeding history of the Red-crested Pochard Netta rufina in Bavaria |
| Auteurs : | Wolfgang Hiller, Auteur ; Christoph Moning, Auteur |
| Type de document : | Article |
| Dans : | Ornithologischer Anzeiger (47(2-3) DEC 2008) |
| Article en page(s) : | 130-147 |
| Résumé : | Following a first recapitulatory report on the Red-crested Pochard in Bavaria by Bezzel (1962, 1963), this article presents more recent data on migration, roosting, moulting and the breeding history of the Red-crested Pochard in Bavaria.Migrating Red-crested Pochards have been observed since the beginning of the 19th century (1811) in Bavaria. From the mid 1980s Red-crested Pochards where found all year round at an increasing number of Bavarian wetlands. Red-crested Pochards have now been reported from more than 260 different sites in Bavaria. Average annual totals of birds reported rose from 1000 in 1973 to 32750 in the period 2000 to 2005. Red-crested Pochards are still spreading in Bavaria.Seasonal distribution in the period 2000 to 2005 remains essentially the same as between 1930 and 1962, albeit with a threehundred fold larger number of individuals per year. At larger wetlands the numbers of individuals change markedly in the course of the year with annual maxima on migration in October and November. During the moulting period between June and August, Red-crested Pochards concentrate at the Ismaninger Reservoir, where 1141 individuals were recorded in 1975 and 15833 in 2005.The number of successfully breeding Red-crested Pochards in Bavaria has increased substantially. In 2005 105 successful broods were recorded as against eight in 1975. On average Red-crested Pochards may be found breeding at suitable wetlands only 10-50 years after the first record. The great majority (91%) of bavarian Red-crested Pochards breed at artificial waters. |
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