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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Long-term population trends of migratory bird species in Germany
Auteurs :	Michael Schmitz, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (132(4) 2011)
Article en page(s) :	167-196
Résumé :	To stress the importance of protection measures for migratory bird species moulting, staging, or over wintering in Germany, it was decided to compile a Red List of Migratory Bird Species. In this Red List the more sophisticated and consistent system of criteria developed by LUDWIG et al. (2005, 2006) is used. One assessment criterion is the long-term trend that was documented in a comprehensive study on all migratory bird species, subspecies, or bio-geographical populations, which use Germany regularly as a breeding, moulting, passage and/or overwintering site. Analogous to the Red List of Breeding Birds (SUDBECK et al. 2007) a period of 100-150 years is considered. Three criteria classes are used: long-term, significant increase in population, long-term stable population, and long-term, significant decrease in population. The parameters of population size, distribution area, and habitat are used to identify prevailing trends. As an ancillary to this, in some cases conclusions about changes in population outside the breeding season can be drawn based on the development of the breeding population in Germany. Broader developments are also considered. According to the availability of data, different procedures of increasing complexity were used to determine trends: 1) a compilation of currently documented details of long-term population changes, 2) determination of trends on the basis of a comparison of historical handbooks and further works of general significance with the current situation, 3) determination by means of an exhaustive evaluation of historical regional avifaunas as well as other articles from historical journals in comparison with the current situation.74 migratory bird species, subspecies, or bio-geographical populations demonstrate a long-term significant increase in population,

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