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Gwynne L. Chandler

Fish Biologist

322 East Front Street, Suite 401
Boise, ID 83702
Contact Gwynne L. Chandler

Current Research

Database development and support for aquatics research. Development of web delivery tools to promote the sharing of data and current research results.Development of database management and analysis tools.Development of protocols for sampling stream temperatures using digital dataloggers.Development of stream temperature macros for import, QA/QC, and summary of data collected with digital temperature recorders.

Research Interests

My research interests focus on the development of models that can be used to help explain the current and future conditions of the stream system and the ultimate challenges climate change may bring. I hope to learn more about the modeling process and also would like to bring in the biological component to the stream temperature network we are now working on.

Past Research

Research is important simply because the world around us is in constant change. Temperature data is easy and relatively inexpensive to collect but combersum to organize and analyze in a timely manner. Therefore on the stream temperature front we are data rich and information poor. Development of tools for managers and other researchers to use to expedite and organize stream temperature data on a temporal and spatial scale will allow us to utilize the data already available. This will give those on the management side the ability to make more informed decisions. Those in research will be able to use this information to better formulate questions and ultimately bring in the biological data. Tools that allow us to standardize the way the data is stored also opens up data sharing on a much larger scale.

Why This Research is Important

Development of a regional stream temperature database for use in model development.Assisted in development of a database that will be used to model food web changes in an Idaho reservoir.Writing of computer macros to import and summarize stream temperatures.


  • University of Wisconsin at Stevens Point, B.S., Water Resources and Biology, 1984
  • University of Idaho, M.S., Fisheries Management, 1987
  • Featured Publications


    Thurow, Russ F.; Peterson, James T.; Chandler, Gwynne L.; Moffitt, Christine M.; Bjornn, Theodore C., 2020. Concealment of juvenile bull trout in response to temperature, light, and substrate: Implications for detection
    Isaak, Daniel J.; Luce, Charles H.; Horan, Dona; Chandler, Gwynne L.; Wollrab, Sherry P.; Dubois, William B.; Nagel, David E., 2020. Thermal regimes of perennial rivers and streams in the western United States
    Isaak, Daniel J.; Young, Michael K.; McConnell, Callie; Roper, Brett B.; Archer, Eric K.; Staab, Brian; Hirsch, Christine; Nagel, David E.; Schwartz, Michael K.; Chandler, Gwynne L., 2018. Crowd-sourced databases as essential elements for Forest Service partnerships and aquatic resource conservation
    Isaak, Daniel J.; Luce, Charles H.; Horan, Dona; Chandler, Gwynne L.; Wollrab, Sherry P.; Nagel, David E., 2018. Global warming of salmon and trout rivers in the northwestern U.S.: Road to ruin or path through purgatory?
    Isaak, Daniel J.; Luce, Charles H.; Chandler, Gwynne L.; Horan, Dona; Wollrab, Sherry P., 2018. Principal components of thermal regimes in mountain river networks
    Isaak, Daniel J.; Wenger, Seth J.; Peterson, Erin E.; Ver Hoef, Jay M.; Nagel, David E.; Luce, Charles H.; Hostetler, Steven W.; Dunham, Jason B.; Roper, Brett B.; Wollrab, Sherry P.; Chandler, Gwynne L.; Horan, Dona; Payne (Parkes) , Sharon L., 2017. The NorWeST summer stream temperature model and scenarios for the western U.S.: A crowd-sourced database and new geospatial tools foster a user community and predict broad climate warming of rivers and streams
    Wenger, Seth J.; Isaak, Daniel J.; Dunham, Jason B.; Fausch, Kurt D.; Luce, Charles H.; Neville, Helen M.; Rieman, Bruce E.; Young, Michael K.; Nagel, David E.; Horan, Dona; Chandler, Gwynne L., 2011. Role of climate and invasive species in structuring trout distributions in the interior Columbia River Basin, USA
    fishing on snake river
    Anyone familiar with the Columbia River’s massive salmon die-off a few summers ago might also be concerned about how climate change will affect fish habitats. The 2015 die-off killed more than 250,000 fish and was blamed on record low streamflows and high water temperatures. While coldwater fish such as salmon and trout can adjust to slightly warmer-than-normal temperatures for short periods, abnormally high temperatures for prolonged periods lower oxygen levels, increase the likelihood of deadly diseases, and cause life-threatening physiological stress.
    The website provides: 1) A large list of supporting science behind eDNA sampling. 2) The recommended field protocol for eDNA sampling and the equipment loan program administered by the NGC. 3) A systematically-spaced sampling grid for all flowing waters of the U.S. in a downloadable format that includes unique database identifiers and geographic coordinates for all sampling sites. Available for download in an Geodatabase or available by ArcGIS Online map. This sampling grid can be used to determine your field collection sites to contribute. 4) The lab results of eDNA sampling at those sites where project partners have agreed to share data.
    Spatial statistical models for streams provide a new set of analytical tools that can be used to improve predictions of physical, chemical, and biological characteristics on stream networks. The Spatial Tools for the Analysis of River Systems (STARS) and Spatial Stream Network (SSN) models are unique because they account for patterns of spatial autocorrelation among locations based on both Euclidean and in-stream distances
    Thermal regimes are important to aquatic ecosystems because they strongly dictate species distributions, productivity, and abundance. The stream temperature modeling and monitoring web site provides resources to help those in the western United States organize temperature monitoring efforts, describes techniques for measuring stream temperatures, and describes several statistical models for predicting stream temperatures and thermally suitable fish habitats from temperature data.

    RMRS Science Program Areas: 
    Air, Water and Aquatic Environments