Anticoagulant Rodenticides in Three Owl Species from Western Canada, 1988–2003

  • Courtney A. Albert
  • Laurie K. Wilson
  • Pierre Mineau
  • Suzanne Trudeau
  • John E. Elliott
Article

Abstract

Anticoagulant rodenticides are widely used to control rodent infestations. Previous studies have shown that nontarget organisms, such as birds, are at risk for both primary and secondary poisoning. This paper presents rodenticide residue information on the livers from 164 strigiformes which included barn owls (Tyto alba), barred owls (Strix varia), and great horned owls (Bubo virginianus), collected from 1988 to 2003 in the province of British Columbia and the Yukon Territory, Canada. Livers were analyzed for brodifacoum, bromadiolone, chlorophacinone, diphacinone, difethialone, and warfarin. Our results show that, of the 164 owl livers analyzed, 70% had residues of at least one rodenticide, and of these 41% had more than one rodenticide detected. Of the three species of owls examined, barred owls were most frequently exposed (92%, n = 23); brodifacoum and bromadiolone were most often detected, with liver concentrations ranging from 0.001 to 0.927 mg/kg brodifacoum, and 0.002 to 1.012 mg/kg bromadiolone. Six of the owls (three barred owls, two barn owls, and one great horned owl) were diagnosed as having died from anticoagulant poisoning; all six owls had brodifacoum residues in the liver.

References

  1. Anderson GG, Kluge HA (1986) Rodent control on agricultural land in British Columbia. Ministry of Agriculture and Food, CanadaGoogle Scholar
  2. British Columbia Ministry of Agriculture, Food and Fisheries (1996) Control of rats and mice on poultry farms. http://www.agf.gov.bc.ca/resmgmt/publist/300series/384200-6.pdf
  3. Buckle AP, Prescott CV, Ward KJ (1994) Resistance to the first and second generation anticoagulant rodenticides – a new perspective. In: Halverson WS, Marsh RE (eds) Proceedings of the sixteenth vertebrate pest conference, pp 138–144Google Scholar
  4. Campbell RW, Dawe NK, McTaggart-Cowan I, Cooper JM, Kaiser GW, McNall MCE (1990) Birds of British Columbia, vol II Nonpasserines. Royal British Columbia Museum, Victoria, pp 353–375Google Scholar
  5. Campbell EC, Campbell RW (1984) COSEWIC status report on the Barn Owl Tyto alba in Canada. Committee on the Status of Endangered Wildlife in Canada. 77 ppGoogle Scholar
  6. COSEWIC (2001) COSEWIC assessment and update status report on the Barn Owl Tyto alba in Canada. Committee on the Status of Endangered Wildlife in Canada, Ottawa, vii + 11 ppGoogle Scholar
  7. Cox P, Smith RH (1992) Rodenticide ecotoxicology: pre-lethal effects of anticoagulants on rat behaviour. In: Borrecco JE, Marsh RE (eds) Proceedings of the 15th vertebrate pest conference. University of California, Davis, California, USA. pp 165–170. Google Scholar
  8. Eason CT, Murphy E, Wright GR, Spurr EB (2002) Assessment of risks of brodifacoum to non-target birds and mammals in New Zealand. Ecotoxicology 11:35–48CrossRefGoogle Scholar
  9. Eason CT, Ogilvie S, Miller A, Henderson R, Shapiro L, Hix S, MacMorran D (2008) Smarter pest control tools with low residue and humane toxins. In: Timms RM, O'Brien JM (eds) Proceedings of the 23rd vertebrate pest, San Diego, pp 148–153. University of California, Davis, CA, USAGoogle Scholar
  10. Environment Canada and Ministry of Water, Land and Air Protection (2005) Survey of pesticide use in British Columbia: 2003. Prepared by ENKON environmental limited project no. 1004-011Google Scholar
  11. Fisher P, O’Connor C, Wright G, Eason CT (2003) Persistence of four anticoagulant rodenticides in the livers of laboratory rats. Department of Conservation Science Internal Series 139, New ZealandGoogle Scholar
  12. Hegdal PL, Colvin BA (1988) Potential hazard to eastern screech-owls and other raptors of brodifacoum bait used for vole control in orchards. Environ Toxicol Chem 7:245–260CrossRefGoogle Scholar
  13. Hindmarch S. How does land use influence the distribution and breeding success of barn owl (Tyto alba) in the lower mainland, British Columbia. Simon Fraser University, M Sc (in prep)Google Scholar
  14. Howald GR, Mineau P, Elliott JE, Cheng KM (1999) Brodifacoum poisoning of avian scavengers during rat control on a seabird colony. Ecotoxicology 8:431–447CrossRefGoogle Scholar
  15. Laas FY, Forss DA, Godfrey MER (1985) Retention of brodifacoum in sheep tissues and excretion in faeces. New Zeal J Agr Res 28:357–359Google Scholar
  16. LiphaTech Inc. (2007) Maki Parafanized pellets material safety data sheet (PCP Registration No. 20258). LiphaTech Inc, 3600 W. Elm Street, Milwaukee, WI 53209Google Scholar
  17. Mendenhall VM, Pank LF (1980) Secondary poisoning of owls by anticoagulant rodenticides. Wildlife Soc B 8(4):311–315Google Scholar
  18. Merson MH, Byers RE, Kaukeinen DE (1984) Residues of the rodenticide brodifacoum in voles and raptors after orchard treatment. J Wildlife Manage 48:212–216CrossRefGoogle Scholar
  19. Newton I, Wyllie I, Freestone P (1990) Rodenticides in British barn owls. Environ Pollut 68:101–117CrossRefGoogle Scholar
  20. Newton I, Dale L, Finnie JK, Freestone P, Wright J, Wyatt C, Wyllie I (1998) Wildlife and pollution: 1997/98 Annual Report. JNCC Report No. 285Google Scholar
  21. Newton I, Shore RF, Wyllie I, Birks JDS, Dale L (1999) Emperical evidence of side-effects of rodenticides on some predatory birds and mammals. In: Cowan DP, Feare CJ (eds) Advances in vertebrate pest management. Filander Verlag, Furth, pp 347–367Google Scholar
  22. Newton, I, Afsar A, Dale L, Finnie J, Shore R F, Wright J, Wyatt C, Wyllie I (2000) Wildlife and pollution: 1998/99 annual report. JNCC report, No. 305Google Scholar
  23. Parmar G, Bratt H, Moore R, Batten PL (1987) Evidence for a common binding-site in vivo for the retention of anticoagulants in rat liver. Hum Toxicol 6:431–432Google Scholar
  24. Pest Management Regulatory Agency (2006) Reevaluation decision: brodifacoum, bromodiolone, chlorophacinone, diphacinone and warfarin. Health Canada, Ottawa, OntarioGoogle Scholar
  25. Stone WB, Okoniewski JC, Stedelin JR (1999) Poisoning of wildlife with anticoagulant rodenticides in New York. J Wildlife Dis 35(2):187–193Google Scholar
  26. Stone WB, Okoniewski JC, Stedelin JR (2003) Anticoagulant rodenticides and raptors: recent findings from New York, 1998–2001. B Environ Contam Tox 70:34–40CrossRefGoogle Scholar
  27. US EPA (2004) Potential risks of nine rodenticides to birds and nontarget mammals: a comparative approach. Washington DC, USAGoogle Scholar
  28. Vandenbroucke V, Bousquet-Melou A, De Backer P, Croubles S (2008) Pharmacokinetics of eight anticoagulant rodenticides in mice after single oral administration. J Vet Pharmacol Ther 31:437–445CrossRefGoogle Scholar
  29. Walker LA, Turk A, Long SM, Wienburg CL, Best J, Shore RF (2008) Second generation anticoagulant rodenticides in tawny owls (Strix aluco) from Great Britain. Sci Total Environ 392:93–98CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Courtney A. Albert
    • 1
  • Laurie K. Wilson
    • 2
  • Pierre Mineau
    • 3
  • Suzanne Trudeau
    • 3
  • John E. Elliott
    • 1
  1. 1.Science and Technology BranchEnvironment Canada, Pacific and Yukon RegionDeltaCanada
  2. 2.Canadian Wildlife ServiceEnvironment Canada, Pacific and Yukon RegionDeltaCanada
  3. 3.Science and Technology Branch, Environment CanadaNational Wildlife Research CenterOttawaCanada

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