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Factors influencing estimation of pesticide-related wildlife mortality

United States Geological Survey, Patuxent Wildlife Research Center, Laurel, Maryland, nimish_vyas{at}usgs.gov

Free-ranging wildlife is regularly exposed to pesticides and can serve as a sentinel for human and environmental health. Therefore a comprehensive pesticide hazard assessment must incorporate the effects of actual applications on free-ranging wildlife. Mortality is the most readily reported wildlife effect, and the significance of these data can be realized only when placed in context with the factors that affect the gathering of this type of information. This paper reviews the variables that affect the collection of wildlife mortality data. Data show that most effects on wildlife are not observed, and much of observed mortality is not reported. Delays in reporting or in the response to a report and exposure to multiple stressors distort the exposure-effect relationship and can result in uncertainty in determining the cause of death. The synthesis of information strongly indicates that the actual number of affected animals exceeds the number recovered.

Key Words: confirmation • detection • hazard assessment • mortality • pesticides • reporting • wildlife

Toxicology and Industrial Health, Vol. 15, No. 1-2, 187-192 (1999)
DOI: 10.1177/074823379901500116


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