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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	[Monitoring of Black-tailed Godwit Limosa limosa populations at their roost on Muenster sewage farm]
Auteurs :	Christoph Grueneberg, Auteur ; Johannes Melter, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (122(1) 2001)
Article en page(s) :	29-39
Résumé :	Black-tailed Godwits were counted almost daily on their roost and feeding site 'Rieselfelder Muenster' (formerly sewage farms of Muenster, Germany) during March - July from 1969 to 1999. In this paper we analyse trends in the numbers of birds at the roost site in relation to those breeding in the surroundings (breeding sites in the 'Muensterland' area) and in relation to weather conditions. Breeding sites are located within a distance of maximal 35 km to 'Rieselfelder Muenster'. Numbers of birds at the roost before the breeding season (15th March to 15th April) varied from year to year, but without any trend. In contrast, the breeding population has decreased since beginning of the study. Numbers of birds in Muenster in that period are negatively correlated with rain fall from January to March. Habitat conditions have deteriorated at the surrounding breeding sites so that presumably the birds are forced to fly more often to Muenster or concentrate there, not only for roosting but also for foraging. Towards the end of breeding season (in June) Black-tailed Godwits again gather at the roost in Muenster. Formerly these birds were mainly adults which partly moulted their primaries. Their numbers have decreased significantly over the study period. The same trend was found for the number of birds in July (mostly juveniles). Likely causes of these negative trends are increasingly high (and early) losses of cluthes and chicks and therefore low breeding success. The importance of the roost for the regional breeding population is discussed. Up to now the conservation programme of the state government ('Feuchwiesenschutzprogramm Nordrhein-Westfalen') failed to halt the decline of Black-tailed Godwits (and other breeding-birds of wet grasslands). Demands on implementation of effective conservation efforts are given.

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