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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Population trend and breeding of red-crested Pochard Netta rufina at Lake Tegernsee (Upper Bavaria, Germany) from 1973 to 2005
Auteurs :	Wolfgang Hiller, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (45(1) AUG 2006)
Article en page(s) :	45-53
Résumé :	In 1974 we counted 4, in 2004 a maximum of 64 Red-crested Pochards at Tegernsee, the yearly sums increased from 4 in 1974 to 351 in 2005. The development of population at Tegernsee follows the trend at all the lakes in Cenral Europe (Keller 2000a/2000b, Schuster et al. 1983, Heine et al. 1999, Sudfeldt et al. 2002, Wahl et al. 2003, Hiller, unpublished 2005).In the first period from 1974 to 1984 we observed Red-crested Pochards in midwinter (January to April) and in autumn (October to December). Since 1995 we have counted Red-crested Pochard every month of the year.1987: the first breeding took place at the southern end of Tegernsee. At 725 meters above sea level is this the highest breeding location in Bavaria and of all mountain lakes in Central Europe.The conditions for the development of the Red-crested Pochard at Tegernsee are as follows:1965 at Tegernsee the first round- sea sewage in Bavaria was installed. In consequence food resources for Red-crested Pochard, Characeae and other usable submerse water plants had increased (Melzer et al. 1990). Through renaturlalisation and enlargement, an island ("Ringsee-Insel"), which is protected the whole year round, and the shallow stores of the Egerner bay and Ringsee there are better breeding conditions. After the success of the improvement of conditions fur the Red-crested Pochard a further three zones became dedicated areas in 1990 ("Tegernsee-Schutzverordnung"). With buoys clearly defined, areas round the sea offer resting places during watersport activities on the lake.Since the middle of the 1990's hunting for all water birds on Lake Tegernsee has been stopped, due to the many protests against the hunting of water birds in the dense populated area round the lake. The water birds there have gradually got used to people.The status of the Red-crested Poachard has changed in 32 years from being a shy, rare guest, from a rare to a regular breeding bird.

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