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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Characteristics of foraging habitats of the Ring Ouzel Turdus torquatus alpestris at different altitudes in the Oberallgau (Germany, Bavaria, Swabia)
Auteurs :	Monika Schirutschke, Auteur ; Elisabeth K. V. Kalko, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (49(2-3) DEC 2010)
Article en page(s) :	165-173
Résumé :	Characteristics of foraging habitats of the Ring Ouzel Turdus torquatus alpestris at different altitudes in the Oberallgau (Germany, Bavaria, Swabia)In 2003 Ring Ouzel foraging habitats where characterized within two breeding habitats at different altitudes in the Oberallgau (Germany, Bavaria, Swabia) The ring ouzels mainly (62,5 %, n=32) foraged on open meadows and preferred meadows with a significant lower vegetation density Population density was two territories/10 ha (10 territories/50 ha) between 1300 and 1600 in a s 1 and one territory/10 ha (7 territories/70 ha) between 1000 and 1200 m a s 1 Five of seven territories m the lower lying study area were abandoned by the beginning of May 2003 Only one pair bred in this area In the higher level study area all ten pairs stayed till the end of the breeding season In 2007 and 2009 it was again found that ring ouzels left the lower study area from the beginning of May and a general decline of the population there was documented It is suggested that the height and density of meadow vegetation is the reason for abandonment of territories Meadows at low altitude were pastured later in the year than those at higher level A correlation between timing and intensity of grazing and ring ouzel decline is suggested for the studied area In this context, it is argued that the negative effect of excessively intensive pasturing on ring ouzel occurrence should be investigated Long term monitoring programs would be very valuable to document the population trend of the alpine Ring Ouzel

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