Title: Responses of Mexican spotted owls to low-flying military jet aircraft
Author: Johnson, Charles L.; Reynolds, Richard T.;
Source: Res. Note RMRS-RN-12. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 4 p.
Publication Series: Research Note (RN)
Description: To investigate the effects of military fixed-wing aircraft training on the behavior of the endangered Mexican spotted owl (Strix occidentalis lucida), we subjected four adults and one juvenile owl to low-altitude, fixed-wing, jet aircraft overflight trials in Colorado in 1996 and 1997. Trials consisted of three sequential fly-bys, each at a greater aircraft speed and noise level, over owl territories in narrow and steep-walled canyons. All overflights were about 460 m above canyon rims, the lowest altitude allowed during training flights. Maximum noise levels, measured at one owl site, were 78, 92, and 95 dB (sound volume) for the first, second, and third fly-bys, respectively. Behaviors of owls during 25-second fly-by periods ranged from "no response" (no body movements) to "intermediate response" (sudden turning of head). The 25-second fly-by responses did not exceed behaviors ("no movement" to "change of roost") exhibited by the owls during 10-minute pre- and postflight observation periods before and after each fly-by.
Keywords: fixed-wing, F-16 jet, Mexican spotted owl, disturbance, noise
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)
XML: View XML
Johnson, Charles L.; Reynolds, Richard T. 2002. Responses of Mexican spotted owls to low-flying military jet aircraft. Res. Note RMRS-RN-12. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 4 p.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility