U.S. Geological Survey Home Page USGS Patuxent Wildlife Research Center Science Meetings; dedicated to Chandler S. Robbins USGS Patuxent Wildlife Research Center; Science Meetings dedicated to Chandler S. Robbins Dedicated to Chan Robbins USGS Patuxent Wildlife Research Center; Science Meetings dedicated to Chandler S. Robbins Poster Abstracts from USGS Patuxent Wildlife Research Science Meetings, October, 2006
Patuxent Science Meeting 2006 Poster Abstract

Effects of chlorfenapyr on birds

Albers PH, Klein PN, Green DE, Melancon MJ, Bradley B, Noguchi G

A 2-year study was conducted to provide information needed for the development of diagnostic

criteria for chlorfenapyr toxicosis. In the first year, male mallard ducks were fed diets containing

concentrations of 0, 2, 5, or 10 ppm technical chlorfenapyr for 10 weeks, or 5 ppm of a

formulated product for 4 weeks. Survival, body weight, feed consumption (removal), behavior,

and molt progression were monitored. Feed and liver were analyzed for chlorfenapyr and two

metabolites. Five of 10 ducks in the 10 ppm group died and neurotoxic effects were observed in

the 5 and 10 ppm groups. Feed removal increased for ducks receiving chlorfenapyr and body

weights of 5 and 10 ppm ducks were reduced. Loss of body fat, muscle atrophy, and bile

retention were suggestive of metabolic disruption or a decreased ability to digest and absorb

nutrients. Liver and kidney weight/body weight ratios exhibited a positive response to

concentrations of chlorfenapyr in the diet. The study design for the second year was changed

to better evaluate observed abnormalities in nerve tissue.

Friday, September 22, 2006



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