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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Ddt residues and mercury levels in reed cormorants on lake kariba: A hazard assessment
Ostrich, Volume 63, No. 2-3, Year 1992
Notification
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Description
Douthwaite, R.J., Hustler, C.W., Kruger, J. & Renzoni, A. 1992. DDT residues and mercury levels in Reed Cormorants on Lake Kariba: a hazard assessment. Ostrich 63: 123–127. Samples of liver and visceral fat from 86 cormorants Phalacrocorax africanus collected at the eastern end of Lake Kariba between January and October 1986 were analysed for 22 organochlorine compounds. Residues of four insecticides were detected but concentrations of hexachlorobenzene, Hch and lindane in liver did not exceed 0.3 mg kg−1extractable lipid. Unaltered DDT, or its metabolites DDD and DDE, were found in every sample, almost all as DDE. Levels varied seasonally, with the highest found between May and September. Risk of increased mortality in full-grown birds was negligible but visceral fat of adult females contained DDE levels associated elsewhere with eggshell thinning and breeding failure in a related species. In a separate study, tissues from ten birds were analysed for mercury. Up to 13.6 mg mercury kg1dry weight was found in liver tissue but this should not increase risk of mortality significantly. © 1992 Taylor and Francis Group, LLC.
Authors & Co-Authors
Douthwaite, Robert J.
Zimbabwe
Tsetse and Trypanosomiasis Control Branch
Hustler, C. W.
Zimbabwe
Natural History Museum
Krüger, J.
Germany, Saarbrucken
Universität Des Saarlandes
Renzoni, A.
Italy, Siena
Università Degli Studi Di Siena
Statistics
Citations: 9
Authors: 4
Affiliations: 4
Identifiers
Doi:
10.1080/00306525.1992.9633963
ISSN:
00306525
e-ISSN:
1727947X
Research Areas
Environmental
Participants Gender
Female