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Organochlorines in eggs and food organisms of avocets (Recurvirostra avosetta)



Organochlorines in eggs and food organisms of avocets (Recurvirostra avosetta)



Bulletin of Environmental Contamination and Toxicology 58(2): 219-226



The concentration of organochlorines in R. avosetta eggs was compared with that found in food organisms collected at a breeding site near Hussum, Germany, and overwintering sites on the esturies of the rivers Seine, Vilaine, Loire and the Baie de L'Aiguillon, France, and at the esturies of the Tejo and Sado, Portugal. During the breeding seasons of 1991-92, 20 eggs were collected from 14 birds which had overwintered at a known site. In the same years, 46 samples of food organisms (polychaetes, crustaceans, molluscs and chironomid larvae) were taken and analysed with the eggs for the presence of polychlorinated biphenyls (PCBs) and a number of other organochlorine compounds including DDT, HCH isomers and hexachlorobenzene. Organochlorine levels in eggs at the study site were low (mean 725 ppb). It could be determined that PCBs in eggs originated from both wintering and breeding sites because certain mixes of compounds were also found in prey items collected from particular sites. The choice of feeding habitat and their specialisation and preference for a soft substrate combined with the accumulation of PCBs in fat tissues of their dominant prey provide several 'PCB traps' for feeding R. avosetta.

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Accession: 002913052

Download citation: RISBibTeXText

PMID: 8975797

DOI: 10.1007/s001289900323


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