High exposure rates of anticoagulant rodenticides in predatory bird species in intensively managed landscapes in Denmark

Archives of Environmental Contamination and Toxicology
Thomas Kjær ChristensenMorten Elmeros

Abstract

The extensive use of anticoagulant rodenticides (ARs) for rodent control has led to widespread secondary exposure in nontarget predatory wildlife species. We investigated exposure rates and concentrations of five ARs in liver samples from five raptors and six owls from Denmark. A total of 430 birds were analysed. ARs were detected in 84-100 % of individual birds within each species. Multiple AR exposure was detected in 73 % of all birds. Average number of substances detected in individual birds was 2.2 with no differences between owls and raptors. Difenacoum, bromadiolone, and brodifacoum were the most prevalent substances and occurred in the highest concentrations. Second-generation ARs made up 96 % of the summed AR burden. Among the six core species (sample size >30), summed AR concentrations were lower in rough-legged buzzard (Buteo lagopus) and long-eared owl (Asio otus) than in barn owl (Tyto alba), buzzard (B. buteo), kestrel (Falco tinnunculus), and tawny owl (Strix aluco). There was a strong tendency for seasonal variations in the summed AR concentration with levels being lowest during autumn, which is probably related to an influx of less-exposed migrating birds from northern Scandinavia during autumn. High hepatic AR ...Continue Reading

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Citations

Sep 21, 2013·Environmental Monitoring and Assessment·John E ElliottFrance Maisonneuve
Jan 21, 2014·Journal of Zoo and Wildlife Medicine : Official Publication of the American Association of Zoo Veterinarians·Cheryl A DyerLoretta P Mayer
Apr 8, 2015·The Science of the Total Environment·Elisabeth BroJames Devillers
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Jun 1, 2017·The Science of the Total Environment·Mario ChiariFrancesca Caloni
Jan 9, 2019·Environmental Science and Pollution Research International·Morten ElmerosChristopher John Topping
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Dec 10, 2016·Drug Metabolism and Disposition : the Biological Fate of Chemicals·Marlène Damin-PernikVirginie Lattard
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Feb 27, 2019·The Science of the Total Environment·Laurel E K SerieysM Justin O'Riain
Jun 27, 2014·Environmental Science & Technology·Barnett A RattnerNico van den Brink

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