La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Status and population trend of Corncrake Crex crex in Germany (2016)
Auteurs :	Jochen Bellebaum, Auteur ; Christoph Grueneberg, Auteur ; Johanna Karthaeuser, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (136(2-3, Sp. Iss.) 2016)
Article en page(s) :	113-120
Résumé :	During the last 20 years our knowledge of the Corncrake breeding distribution and trends in numbers in Germany has greatly improved, despite the difficulties in surveying the species. Data from previous (1974-1995) and recent (2005-2009) breeding bird atlas work show the presence of Corncrakes in all major natural regions as well as an overall increase in atlas grid occupancy. The increase was most obvious in the Northern German Plain, whereas in the Southwest occupancy dropped by a factor of 0.56.Densities of calling males in selected core breeding sites recorded since 1990 showed a significant trend with an increase before and a decrease after 1998. Influx years in 1998-1999, 2002-2003, 2007-2008, and to a lesser extent 2012 led to a high degree of year-to-year variation. In such years much higher numbers are found outside the core breeding areas, too. These fluctuations were also reflected in estimates of national population size regularly produced in the course of national Red List updates.

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