La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	The genus Aythya at the "Franconian Pond Area": Ferruginous Duck A-nyroca, Pochard A-fierina, tufted duck marila A-fuligula and Scaup A-marila
Auteurs :	Manfred Kraus, Auteur ; Werner Krauss, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (45(1) AUG 2006)
Article en page(s) :	21-43
Résumé :	All four Aythya species occuring in the area are being documented regarding frequency, phenology and development of population of the three breeding species. It has been proved that Ferruginous Duck A. nyroca bred at the "Franconian Pond Area" for over 100 years but for the last time in 1963. A few pairs of Pochard A. ferina as well have been breeding for more than 100 years. The breeding population has increased since the 1950's and is currently up to at least 150 pairs. At the same time the number of visitors has increased considerably. The annual daily maxima were below 50 in the 1950's but has reached over 1000 individuals in 58% of the years since 1973. Breeding of Tufted Duck A. fuligula was first proven in the area in 1952. In the mid 1960's the number of breeding birds increased remarkably. Today it is the most frequent breeding duck with up to more than 300 pairs. The daily maximum as bird of passage reached 1.800 individuals in 1991. Details are presented concerning biology and especially breeding biology of these three species. Scaup A. marila is not annual bird of migration or winter visitor. All available data of hybrids of Aythya are being documented.

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...