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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	On the winter population of Yellowhammer Emberiza citrinella in the administrative district of Aichach-Friedberg (Bavaria)
Auteurs :	Uwe Bauer, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (51(1) AUG 2012)
Article en page(s) :	49-64
Résumé :	After preliminary surveys in winter 2009/2010, the wintering population of Yellowhammer Emberiza citrinella in the administrative district of Aichach-Friedberg (Bavaria) was systematically recorded from November 2010 to March 2011, including the relevant winter period from December 2010 to February 2011. The survey covered an area of about 780 km(2) comprising 207 of the 234 villages/towns in the administrative district.The main results can be summarized as follows:In the total period from November 2010 to March 2011 a total of 3,335 Yellowhammers was counted, 2,668 of these between December 2010 and February 2011. Ratio of males to females ("female coloured"): 1:2.5 (n = 791 individuals). Average size of flocks: 24.7 individuals (n = 84 swarms); if the biggest swarm of 269 individuals is included the average size amounts to 35.4. 17 different categories of feeding sites were recognized; of vital importance were sites with horses, farmyards, non-harvested grain fields, arable fields, silos for maize, fallow land (maize), bird feeders, cereal stubble fields, enclosures for fallow deer, feeding sites for pheasants and ruderal areas.Fluctuations of Yellowhammers have been observed during the course of the survey.The effect of changing use of farmland on the wintering of Yellowhammers is discussed.

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