| Titre : | Resting and wintering Red-crested Pochards Netta rufina at Lake Starnberg from 1966 to 1988 |
| Auteurs : | Andreas Lang, Auteur ; Andreas Mueller, Auteur ; Franziska Lange, Auteur ; Andreas Lange, Auteur |
| Type de document : | Article |
| Dans : | Ornithologischer Anzeiger (38(1) March, 1999) |
| Article en page(s) : | 21-30 |
| Résumé : | The number of Red-crested Pochards occurring in the winter season at Lake Starnberg was analysed for the period from 1966 to 1998. In general, the abundance of resting Red-crested Pochards increased reaching its maximum in the 1997/98 season (winter sum of 802 individuals with a peak of 315 individuals in December 1997). During the last three decades numbers of Netta rufina showed varying long-term trends as well as fluctuations from year to year. The winter population increased from 1966 to 1978/79, decreased from 1979 to 1988/89, and increased again since 1989 with strong annual fluctuations. On average, the highest, abundance of the species was recorded in October and November. During the last ten years, the Red-crested Pochard seems to expand its duration of stay during winter months, which may indicate the development of a wintering tradition. Considerable numbers of wintering individuals were recorded in winter 1997/98 for the first time since the start of the study (83 individuals in January 1998, 72 in February 1998). Compared to other Bavarian lakes, Lake Starnberg seems to offer ideal conditions for wintering Red-crested Pochards. It provides large amounts of the essential submerse food plants and is seldom covered by ice. However, the seemingly increasing winter population is strongly threatened by disturbances of various origins such as surfing, sailing, sports diving, and shooting, and cause waterfowl to leave the lake. Therefore, a considerable reduction of the impact of this disturbance is absolutely necessary in order to protect the endangered Red-crested Pochard and other waterfowl. This would generally benefit the important bird area Lake Starnberg which is protected according to the guidelines of the Ramsar agreement for waterfowl. |
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