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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	[Monitoring breeding success of coastal birds in the Wadden Sea 1996 and 1997]
Auteurs :	Stefan Thyen, Auteur ; Peter H. Becker, Auteur ; Klaus-Michael Exo, Auteur ; Bernd Haelterlein, Auteur ; Hermann Hoetker, Auteur ; Peter Suedbeck, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (121(5-6) 2000)
Article en page(s) :	269-280
Résumé :	In the framework of the "Trilateral Monitoring and Assessment Program" (TMAP), a pilot study on monitoring breeding success of coastal birds was carried out in 1996 and 1997. The objective of this study was to test the applicability of the methodical concept and to assess the value of the recorded data for the Wadden Sea conservation and especially for the future integration of the parameters of breeding success into the TMAP. Hatching and breeding success and body mass development of chicks were investigated in several species. Because Oystercatchers, Avocets, and Black-headed Gulls achieved higher hatching and breeding success in 1997 than in 1996, and because of higher growth rates in Black-headed Gull chicks, a more favourable food availability in benthic resources in 1997 is assumed. Influences of the ice-winter 1995/1996 are discussed as probable causes for food shortage in 1996. Furthermore, the availability of young fish, weather, and agricultural land-use are discussed as factors affecting hatching and breeding success. The vane of these monitoring results is discussed in view of the Wadden Sea management, the protection of coastal birds, and the trilateral monitoring. The essential importance of monitoring breeding success for an effective Wadden Sea and coastal birds conservation is concluded from the results obtained during the pilot study.

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