Review and Management Recommendations for study titled "Retention time of chlorophacinone in the tissues of black-tailed prairie dogs exposed to chlorophacinone bait." : Final Report
Joy Gober Matt Schwarz
1 - 16
Final report and management recommendations for the Off-Refuge Environmental Contaminants Investigation titled "Retention time of chlorophacinone in the tissues of black-tailed prairie dogs exposed to chlorophacinone." The main component of the investigation included a laboratory study performed by the U.S. Department of Agriculture's National Wildlife Research Center (Center) in Fort Collins, Colorado. The South Dakota Ecological Services Field Office has reviewed the study report submitted by the Center (Witmer, 2011) and has prepared comments and management recommendations in light of the study findings.
Witmer (2011) provides valuable information on prairie dog chlorophacinone excretion, residue concentrations, and observed effects from toxicity; however, the limited prairie dog exposure to chlorophacinone bait in the current study underestimates what would occur during a field application. For reasons specified in our enclosed review, the amount of bait (53 grams each) and time of exposure (1-2 days) for the lab study are much lower than what would be expected for a field application. 16 pages plus attached Witmer report (59pp).
U.S. Fish and Wildlife Service
http://www.fws.gov/mountain-prairie/contaminants/papers/documents/SchwarzandGober2011.pdf, 7 MB
U.S. Fish and Wildlife Service - Mountain-Prairie Region, Contaminants Program