2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/08/2017 | 9:30 AM - 9:45 AM | USING STREAM TEMPERATURE DISTRIBUTIONS INSTEAD OF SINGLE METRICS TO EVALUATE THERMAL RESPONSES TO FOREST HARVEST | 306A
USING STREAM TEMPERATURE DISTRIBUTIONS INSTEAD OF SINGLE METRICS TO EVALUATE THERMAL RESPONSES TO FOREST HARVEST
Stream temperatures are influenced by numerous processes, especially changes in land management. Maximum daily temperature is a commonly used metric for evaluating responses. However, single metrics do not fully represent the magnitude and duration of temperatures experienced by instream biota. Analyses that make use of all the data more accurately a) characterize shifts in summer stream temperature regimes, b) quantify potential exposure to critical and non-critical temperatures, and c) help researchers and managers to better understand stream temperature responses to manipulations. Here we examine the distributions of summer stream temperatures before and after forest harvest in the Trask River Watershed Study in northwestern Oregon. We studied 15 small streams for 10 years; half of the watersheds were clearcut harvested in 2012. We observed high spatial and temporal variation among sites and years, with some sites having normally distributed temperatures, while others showed skewed distributions and long tails. We compare observed temperatures to known thermal tolerances for tailed frog tadpoles, Ascaphus truei. With these analyses, we are quantifying chronic exposure, which could subsequently result in shifts in phenology or community structure.
- C36 Water Resource Management
- C22 Disturbance
- C27 Landuse and Non-Point source Impacts
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Presenters/Authors
Sherri Johnson
(), U.S. Forest Service, Pacific Northwest Research Station, sherrijohnson@fs.fed.us;
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Maryanne Reiter
(), Weyerhaeuser Company, maryanne.reiter@weyerhaeuser.com;
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Jay Jones
(), Weyerhaeuser Company, Jay.Jones@weyerhaeuser.com;
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