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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Current situation of pollutants in eggs of Great Cormorant Phalacrocorax carbo sinensis in the southern Baltic Sea: Does p,p\'-DDE still cause eggshell thinning?
Auteurs :	Thomas Kellner, Auteur ; Susanne Lage, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (130(1) 2009)
Article en page(s) :	49-63
Résumé :	The investigation of contamination of Great Cormorants with chlorinated hydrocarbons in the southern Baltic Sea in 2005 primarily aimed to test whether values of compounds actually found in eggs reflect he present situation of the contamination in the Baltic ecosystem. The other important question was whether eggshell thinning occurs in Baltic Great Cormorants an therefore is a continuing problem in general. Twenty-two eggs from a coastal colony in Western Pomerania (NE Germany) were analysed for ten individual polychlorinated biphenyls, and for the biocides hexachlorobenzene, hexachlorocyclohexane, dieldrin and dichlorodiphenyltrichloroethane. Additionally, eggshell thickness was measured and indices of eggshell thickness were calculated. The accumulation of the analysed Compounds was high and is associated with the ecology, physiology and biochemistry of that bird species. The located residues were compared with published data on the contamination of Great Cormorant eggs worldwide, with the accumulation level in commercial hen eggs analysed in parallel with the same method, and with permitted upper limits of chlorinated hydrocarbons in the human nutrition. Within a causal connection, only the log(10)-transformed concentration of p,p\'-DDE in probably incubated eggs showed a significant negative correlation with the eggshell thickness as well as with the index of eggshell thickness. The contamination of Great Cormorant eggs actually found seems to reflect the present situation of the contamination in the Baltic. Values Of compounds in eggs decreased since persistent organic pollutants (POPs) were banned all around the Baltic three decades ago. Though, the phenomenon of eggshell thinning continues. The level of eggshell thinning found I in Great Cormorants breeding in the coastal area of Western Pomerania seems to be lower than the empirical threshold beyond which this Population can be affected by pollution.

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