Abstract
A multi-stressor risk assessment was conducted at Yuma Proving Ground, Arizona, as a demonstration of the Military Ecological Risk Assessment Framework. The focus of the assessment was a testing program at Cibola Range, which involved an Apache Longbow helicopter firing Hellfire missiles at moving targets, that is, M60-A1 tanks. This article focuses on the wildlife risk assessment for the helicopter overflight. The primary stressors were sound and the view of the aircraft. Exposure to desert mule deer (Odocoileus hemionus crooki) was quantified using Air Force sound contour programs NOISEMAP and MR_NMAP, which gave very different results. Slant distance from helicopters to deer was also used as a measure of exposure that integrated risk from sound and view of the aircraft. Exposure-response models for the characterization of effects consisted of behavioral thresholds in sound exposure level or maximum sound level units or slant distance. Available sound thresholds were limited for desert mule deer, but a distribution of slant-distance thresholds was available for ungulates. The risk characterization used a weight-of-evidence approach and concluded that risk to mule deer behavior from the Apache overflight is uncertain, but that no risk to mule deer abundance and reproduction is expected.
Original language | English |
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Pages (from-to) | 871-897 |
Number of pages | 27 |
Journal | Human and Ecological Risk Assessment |
Volume | 14 |
Issue number | 5 |
DOIs | |
State | Published - Sep 2008 |
Funding
Received 9 February 2007; revised manuscript accepted 1 September 2007. This article has been authored by a contractor of the U.S. Government under contract DE-AC05-00OR22725. Accordingly, the U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for U.S. Government purposes. William W. Hargrove is currently affiliated with the USDA Forest Service, Eastern Forest Environmental Threat Assessment Center, Asheville, NC, USA. Address correspondence to Rebecca A. Efroymson, Environmental Sciences Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN 37831-6036, USA. E-mail: [email protected]
Keywords
- Aircraft overflight
- Ecological risk assessment
- Mule deer
- Noise
- Noise contour
- Sound