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Residues of DDE and PCB in Eggs from Herring Gull (Larus Argentatus) and Common Gull (Larus Canus) in Norway
Acta Veterinaria Scandinavica volume 12, pages 429–441 (1971)
Abstract
In 1969 294 eggs from herring gull were collected from eight different localities in Norway. The eggshell thicknesses were measured, and 10 eggs from each locality were analysed by gas liquid chromatography for organochlorine insecticides and polychlorinated biphenyls (PGB).
Residues of DDE were demonstrated in all eggs, the concentrations varying from 0.2 to 5.4 p.p.m. in herring gull, and from 0.2 to 3.5 p.p.m. in common gull. DDT occurred only in four eggs from herring gull and then only in concentrations of from 0.1 to 0.3 p.p.m. Other organochlorine insecticides were not detected. Residues of PGB were found in all eggs from herring gull in concentrations of from 0.2 to 3.8 p.p.m. PGB 10, and in six out of nine eggs from common gull, from trace to 0.8 p.p.m. PGB 10.
The analysed material showed a positive correlation between amounts present of DDE and of PGB.
There was a significant difference between localities concerning the contents of DDE and PGB in eggs from herring gull. This variance may be taken into consideration by using the herring gull as an indicator organism, since this bird, especially in the northern part of Norway, is migratory.
The residue concentrations of DDE and PGB were markedly higher in eggs from herring gull than in eggs from common gull. It is suggested that this may be related to the difference between these species in their feeding habits.
The residues of organochlorines demonstrated in this investigation do not seem to have had any effect on eggshell thickness in herring gull.
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Acknowledgment
The authors wish to thank Mr. T. W. Gedde-Dahl, Lie. Agr., for advice and assistance in the statistical work.
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Bjerk, J.E., Holt, G. Residues of DDE and PCB in Eggs from Herring Gull (Larus Argentatus) and Common Gull (Larus Canus) in Norway. Acta Vet Scand 12, 429–441 (1971). https://doi.org/10.1186/BF03547741
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DOI: https://doi.org/10.1186/BF03547741