La Tour du Valat

Article

Development of a moult migration, and flight-feather moult in Ferruginous Ducks Aythya nyroca from Central Europe.

Peter Koehler, Auteur ; Eberhard von Krosigk, Auteur

Dans Vogelwarte (44(2) MAY 2006)

A moult migration in Ferruginous Ducks is described for the first time. The tradition to moult off the breeding grounds began in 1956 in the Ramsar site "Ismaninger Speichersee mit Fischteichen", near to Munich, Upper Bavaria. This development c[...]

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Article

Ferruginous Ducks Aythya nyroca at "Ismaninger Speichersee and Fischteiche": Counts of moulting birds for the years 2003 to 2007 and suspected breeding in 2007.

Peter Koehler, Auteur ; Ursula Koehler, Auteur ; Eberhard von Krosigk, Auteur ; Burkhard Hense, Auteur

Dans Ornithologischer Anzeiger (46(2-3) DEC 2007)

For more than fifty years, Ferruginous Ducks have migrated to this Ramsar site near Munich, Upper Bavaria, Germany, to moult flight-feathers between July and September. From 2003 to 2007, counts averaged twelve (six to twenty five) moulting bird[...]

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Article

[Influence of varied carp stock on the distribution of moulting waterfowl in the fish pond area of Ismaninger Teichgebiet between 1996 and 1999]

Ursula Koehler, Auteur ; Peter Koehler, Auteur ; Ursula Firsching, Auteur ; Eberhard von Krosigk, Auteur

Dans Ornithologischer Anzeiger (39(2-3) September, 2000)

A significant reduction of nutrients in the waters of the Ramsar-site "Ismaninger Speichersee mit Fischteichen" caused a reduced production of food for the waterfowl populations moulting there. Since 1994, some species decreased dramatically, ma[...]

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Article

[Long-term changes of abundance and spatial distribution of moulting waterbirds following changes of trophic state, fish stock and water level in the Ramsar site "Ismaninger Speichersee mit Fischteichen"]

Eberhard von Krosigk, Auteur ; Peter Koehler, Auteur

Dans Ornithologischer Anzeiger (39(2-3) September, 2000)

Following a significant reduction of nutrients, the trophic state of the Ramsar site "Ismaninger Speichersee mit Fischteichen" turned between 1988 and 1999 from polytrophic to eutrophic in the reservoir and from hypertrophic to polytrophic in th[...]

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