Exposure pathways of anticoagulant rodenticides to nontarget wildlife

详细信息    查看全文

• 作者：John E. Elliott (1)
  Sofi Hindmarch (2)
  Courtney A. Albert (3)
  Jason Emery (4)
  Pierre Mineau (5)
  France Maisonneuve (5)
  
• 关键词：Anticoagulants ; Exposure pathways ; Nontargets ; Raptor ; Rat
• 刊名：Environmental Monitoring and Assessment
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：186
• 期：2
• 页码：895-906
• 全文大小：249 KB
• 作者单位：John E. Elliott (1)
  Sofi Hindmarch (2)
  Courtney A. Albert (3)
  Jason Emery (4)
  Pierre Mineau (5)
  France Maisonneuve (5)
  
  1. Science and Technology Branch, Environment Canada, Pacific and Yukon Region, Delta, BC, V4K 3N2, Canada
  2. 2175 McLennan Ave, V6X 2N4, Richmond, BC, Canada
  3. Canadian Wildlife Service, Environment Canada, Pacific and Yukon Region, Delta, BC, V4K 3N2, Canada
  4. SOLITUDO Environmental Services Inc., 11985 Staples Crescent, Delta, BC, V5V 1X, Canada
  5. Science and Technology Branch, Environment Canada, National Wildlife Research Center, Ottawa, ON, K1A 0H3, Canada
  
• ISSN：1573-2959

文摘

Second-generation anticoagulant rodenticides are widely reported to contaminate and poison nontarget wildlife, primarily predatory birds and mammals. Exposure pathways, however, have not been well defined. Here, we examined potential movement of rodenticides from deployment of bait to exposure of small mammals and other biota. At two adjacent working farms, we placed baits containing either brodifacoum or bromadiolone. We monitored movement of those compounds to the surrounding environment by collecting small mammals, birds, and invertebrates. Similar collections were made at a third agricultural setting without active bait deployment, but located among intensive livestock production and regular rodenticide use by farmers. Livers and whole invertebrate samples were analyzed for rodenticides using a sensitive LC-MSMS method. Norway rats (Rattus norvegicus) from both baited and non-baited farms had residues of brodifacoum or bromadiolone, implicating rats as an important exposure pathway to wildlife. Among 35 analyzed nontarget small mammals, a single vole had high hepatic residues (18.6?μ/g), providing some indication of a small mammal pathway. One song sparrow (Melospiza melodia) sample from a baited farm contained 0.073?μg/g of brodifacoum in liver, while 0.39?μg/g of diphacinone was measured in a pool of carrion beetles (Dermestes spp.) from the non-baited farm area, implicating avian and invertebrate components in exposure pathways. Regurgitated pellets of barn owl (Tyto alba) selected randomly from baited farms contained no detectable rodenticide residues, while 90?% of owl pellets collected from a variety of farms, and selected for the presence of rat fur, contained detectable anticoagulant residues. We recorded behavior of a captive sample of a representative songbird, the house sparrow (Passer domesticus); they readily entered bait stations and fed on (unloaded) bait.