| Title: | Spatial and temporal exposure patterns in non-target small mammals during brodifacoum rat control |
| Author(s): | Geduhn A; Esther A; Schenke D; Mattes H; Jacob J; |
| Address: | "Julius Kuhn Institute, Federal Research Centre for Cultivated Plants, Institute for Plant Protection in Horticulture and Forests, Vertebrate Research, Toppheideweg 88, 48161 Munster, Germany; University of Munster, Institute of Landscape Ecology, Heisenbergstrasse 2, 48149 Munster, Germany. Electronic address: anke.geduhn@jki.bund.de. Julius Kuhn Institute, Federal Research Centre for Cultivated Plants, Institute for Plant Protection in Horticulture and Forests, Vertebrate Research, Toppheideweg 88, 48161 Munster, Germany. Julius Kuhn Institute, Federal Research Centre for Cultivated Plants, Institute for Ecological Chemistry, Plant Analysis and Stored Product Protection, Konigin-Luise-Strasse 19, 14195 Berlin, Germany. University of Munster, Institute of Landscape Ecology, Heisenbergstrasse 2, 48149 Munster, Germany" |
| DOI: | 10.1016/j.scitotenv.2014.07.049 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "Worldwide pest rodents on livestock farms are often regulated using anticoagulant rodenticides (ARs). Second generation ARs in particular can cause poisoning in non-target species due to their high toxicity and persistence. However, research on exposure of small mammals is rare. We systematically investigated spatial and temporal exposure patterns of non-target small mammals in a large-scale replicated study. Small mammals were trapped at different distances to bait stations on ten farms before, during and after brodifacoum (BR) bait application, and liver samples of 1178 non-target small mammals were analyzed for residues of eight ARs using liquid chromatography coupled with tandem mass spectrometry. BR residues were present in 23% out of 742 samples collected during and after baiting. We found clear spatial and temporal exposure patterns. High BR residue concentrations mainly occurred within 15m from bait stations. Occurrence and concentrations of residues significantly decreased with increasing distance. This pattern was found in almost all investigated taxa. After baiting, significantly more individuals contained residues than during baiting but concentrations were considerably lower. Residue occurrence and concentrations differed significantly among taxa, with the highest maximal residue concentrations in Apodemus species, which are protected in Germany. Although Sorex species are known to be insectivorous we regularly found residues in this genus. Residues of active agents other than brodifacoum were rare in all samples. The confirmation of substantial primary exposure in non-target small mammals close to the baiting area indicates considerable risk of secondary poisoning of predators, a pathway that was possibly underestimated until now. Our results will help to develop risk mitigation strategies to reduce risk for non-target small mammals, as well as their predators, in relation to biocidal AR usage" |
| Keywords: | 4-Hydroxycoumarins/*metabolism/toxicity Animals Anticoagulants/*metabolism/toxicity Environmental Exposure/analysis/*statistics & numerical data Germany Rodenticides/*metabolism/toxicity Spatio-Temporal Analysis Anticoagulant Bait Primary poisoning Rodent; |
| Notes: | "MedlineGeduhn, Anke Esther, Alexandra Schenke, Detlef Mattes, Hermann Jacob, Jens eng Research Support, Non-U.S. Gov't Netherlands 2014/08/05 Sci Total Environ. 2014 Oct 15; 496:328-338. doi: 10.1016/j.scitotenv.2014.07.049. Epub 2014 Aug 1" |
