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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	[Current results of monitoring pollutants in eggs of coastal birds]
Auteurs :	Stefan Thyen, Auteur ; Peter H. Becker, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (121(5-6) 2000)
Article en page(s) :	281-291
Résumé :	Data collected in the framework of the project "Monitoring Pollutants in Coastal Bird Eggs" along the German North Sea coast in 1998 are presented and compared with several contamination studies conducted at Central European breeding sites during the 1990s. Eggs of Common Terns and Oystercatchers breeding at five sites along the North Sea coast were investigated for residues of PCBs, DDT, HCB. HCHs, and mercury. Interspecific and spatial variation in contamination revealed in former studies was confirmed. Except for HCHs, Common Tern eggs had higher contamination levels than those of Oystercatchers at nearly all study sites explained by differing mechanisms of bioaccumulation of chemicals and a different foraging behaviour of the birds. Especially in Common Terns, eggs collected at the Elbe estuary had higher contamination levels by environmental chemicals than those from other regions. The significance of riverborne pollutant inputs via the Elbe is discussed. Temporal trends of contamination in the period 1981 - 1998 are calculated. Except for Lindane, pollutant concentrations decreased significantly at most study sites. As suggested by current pollutant concentrations in eggs, reproductive success of birds breeding in the Wadden Sea appears to be unaffected by environmental chemicals at present. However, embryotoxic effects of the contamination found at the Elbe estuary cannot ultimately be ruled out. In 1998, "Monitoring Pollutants in Coastal Bird Eggs" was carried out for the first time in the framework of the "Trilateral Monitoring and Assessment Program" (TMAP) of the trilateral co-operation on the protection of the Wadden Sea. Requirements on the TMAP concerning selection of target species, sampling sites, and target chemicals were derived from the present results. The expansion of the program to further coastal regions and to additional chemicals is recommended. Furthermore, the additional implementation of "Monitoring Breeding Success of Coastal Birds" is recommended.

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