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International Journal of Wildland Fire International Journal of Wildland Fire Society
Journal of the International Association of Wildland Fire
RESEARCH ARTICLE

Effects of wildfire on stream temperatures in the Bitterroot River Basin, Montana

Shad K. Mahlum A , Lisa A. Eby A E , Michael K. Young B , Chris G. Clancy C and Mike Jakober D
+ Author Affiliations
- Author Affiliations

A Wildlife Biology Program, College of Forestry and Conservation, University of Montana, Missoula, MT 59812, USA. Email: shadman28@hotmail.com

B US Forest Service, Rocky Mountain Research Station, Forestry Sciences Lab, 800 East Beckwith Avenue, Missoula, MT 59801, USA. Email: mkyoung@fs.fed.us

C Montana Fish, Wildlife and Parks, 1801 North First Street, Hamilton, MT 59840, USA. Email: cclancy@fs.fed.us

D Bitterroot National Forest, 1801 North First Street, Hamilton, MT 59840, USA. Email: mjakober@fs.fed.us

E Corresponding author. Email: lisa.eby@umontana.edu

International Journal of Wildland Fire 20(2) 240-247 https://doi.org/10.1071/WF09132
Submitted: 11 November 2009  Accepted: 8 July 2010   Published: 30 March 2011

Abstract

Wildfire is a common natural disturbance that can influence stream ecosystems. Of particular concern are increases in water temperature during and following fires, but studies of these phenomena are uncommon. We examined effects of wildfires in 2000 on maximum water temperature for a suite of second- to fourth-order streams with a range of burn severities in the Bitterroot River basin, Montana. Despite many sites burning at high severity, there were no apparent increases in maximum water temperature during the fires. One month after fire and in the subsequent year, increases in maximum water temperatures at sites within burns were 1.4–2.2°C greater than those at reference sites, with the greatest differences in July and August. Maximum temperature changes at sites >1.7 km downstream from burns did not differ from those at reference sites. Seven years after the fires, there was no evidence that maximum stream temperatures were returning to pre-fire norms. Temperature increases in these relatively large streams are likely to be long-lasting and exacerbated by climate change. These combined effects may alter the distribution of thermally sensitive aquatic species.

Additional keywords: aquatic ecosystems, disturbance, recovery, watershed.


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