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Aves, 10/3 | 1973 | 161-170
Joiris, C., Lauwereys, M. & Vercruysse, A.
Some tissues from 5 birds of prey found dead in Belgium were analysed for their contents in organochlorine residues. a. Contamination of the birds. The two Sparrowhawks were stringly contaminated in all the tissues analysed (total residues ranging from 5.8 to 50.9 ppm). The Tawny Owl was also strongly contaminated, but only in the muscle (12,7 ppm), not in the liver (1,5 ppm). The two last species (Long-eared Owl and Kite) were not heavily contaminated (total residues ranging from 0.16 to 1.5 ppm); b. Contamination of the different tissues. In three cases, the muscle was clearly more contaminated than the liver; in the two other cases, on the contrary, the liver was the most contaminated; c. Contamination by the different residues. From all the results (n=12° we found that PCB and total DDT-type residues are strongly positively correlated (r=0.98); d. Comparaison with some other european countries. The contamination of the birds of prey is quantitatively comparable in Belgium, Great-Britain and the Netherlands.