Dr. Clint Muhlfeld

Research Ecologist
West Glacier


U.S. Geological Survey
Northern Rocky Mountain Science Center
Glacier Field Station, Glacier National Park
West Glacier, Montana 59936

Phone 406-888-7926
Fax 406-888-7923

Ph.D. 2008. Fish and Wildlife Biology, Montana State University, Bozeman.
Ph.D. Dissertation: Behavioral, ecological, and fitness consequences of hybridization between native westslope cutthroat trout and nonnative rainbow trout

M.S. 1999. Fishery Resources, University of Idaho.
M.S. Thesis: Seasonal habitat use and movement of redband trout in the Kootenai River drainage, Montana

B.S. 1994. Aquatic Biology, University of Montana (1990-1993, University of Maine)

Research interests:

I am a Research Aquatic Ecologist for the USGS Northern Rocky Mountain Science Center in Glacier National Park and Assistant Research Professor at The University of Montana 's Flathead Lake Biological Station. My general research interests encompass the fields of aquatic ecology, fisheries biology, and conservation biology. My research goal is to develop an integrated understanding of the spatiotemporal links between physical and biological processes influencing the distribution, abundance, genetic diversity, and adaptive potential of aquatic biota to inform conservation and management programs for aquatic ecosystems. My applied research focuses on assessing the threats of invasive species, habitat destruction, and climate change on native species in one of the most diverse and intact aquatic ecosystems in North America - the Crown of the Continent Ecosystem in the Rocky Mountains of the USA and Canada. My published research spans a range of questions and conservation issues from examining the fitness and ecological impacts of hybridization and competition between native and non-native salmonids, assessing life history diversity and genetic population structure of native fishes, investigating the impacts of hydroelectric dams and barriers on aquatic invertebrates and entire ecosystems, assessing the potential impacts of climate warming on aquatic ecosystems, to developing quantitative models (e.g., bioenergetics, habitat, landscape connectivity, and population viability) for aquatic communities. I particularly enjoy advising and educating graduate students working on various aspects of aquatic systems and ecology. I enjoy collaboration and multidisciplinary research, and I am currently active in several regional, national, and international science teams that address natural resource issues. My goal and hope is that the ecological integrity of our watersheds will be preserved for future generations through research-informed management and education.


  • Conservation biology of native fishes
  • Invasive aquatic species
  • Hybridization among native and nonnative salmonids
  • Climate change effects on aquatic ecosystems
  • Fish habitat relationships
  • Life history and movement of native salmonids
  • Restoration ecology
  • Instream flow management for native salmonids
  • Bioenergetics modeling of aquatic ecosystems

Professional experience:

  • 2007-present. Research Aquatic Ecologist, USGS-Northern Rocky Mountain Science Center, Glacier Field Station, Glacier National Park
  • 2011-present. Assistant Research Professor, Flathead Lake Biological Station, The University of Montana
  • Spring 2007. Instructor, Montana State University: Principles of Fish and Wildlife Management (F&WL 301)
  • 1999-2007. Fisheries Research Biologist, Montana, Fish, Wildlife & Parks, Kalispell
  • 1994-1998. Fisheries Research Technician, Montana Fish, Wildlife & Parks, Libby