Aves, p�le ornithologique de Natagora

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Aves, 8/1 | 1971 | 1-13

 
Joiris, C. & Martens, P.

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Article summary

A series of 15 clutches of birds of prey, totalising 29 unhatched eggs, were collected in the southern part of Belgium in 1969. The liquid-gaz chromatography analysis reveals a contamination of all the birds of prey by organochlorine pesticides. The Sparrowhawk is an especially contamined species, its eggs containing up to 12 ppm of pesticides. The other species (Buzzard, Kestrel, Tawny owl, Barn owl, Little owl and Tengmalm owl) are much less affected and the pesticide content of their eggs only exceptionally exceeds 1 ppm.

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