Professor and Coop Unit Leader


Contact Info

Institution: Utah State University, Senior Partner

Phone: (435) 797-7564

Address: 5210 Old Main Hill QCNR - Utah State University, Logan, Utah 84322, US


Research Disciplines

  • Conservation Biology

  • Conservation Ecology

  • Natural Resource Management

  • Restoration Ecology

  • Exotic Species

  • Fisheries Management

  • Limnology

  • Climate Change

Research Interests

factors that structure and limit fish populations in both lentic and lotic systems, invasion ecology, food web dynamics of aquatic systems, experimental and adaptive stream restoration, large river management, Intermountain West, Utah, New Mexico, Nevada, Texas, and Alaska, many species of salmonids, imperiled and endangered native desert fishes, numerous warm water lentic fishes


Trophic ecology of Lahontan Cutthroat Trout Oncorhynchus Clarkii Henshawi: historical predator-prey interaction supports native apex predator in unique desert lake. Exploring the contemporary relationship between predator and prey in a culturally-important Lahontan Cutthroat Trout population in Pyramid Lake, Nevada. Pyramid Lake fishery evaluation: evaluating cutthroat trout performance and identifying limiting factors for the native fish community.  Pyramid Lake management plan and associated supportive analyses. Towards a more advanced analytical understanding of the relationship between hydrology and endangered Rio Grande Silvery Minnow persistence and recovery. & 2) Evaluation of Rio Grande Silvery Minnow Life History, Movement Dynamics, and Habitat Use in the Middle Rio Grande. Adaptive management with and installation and development of methods and analyses for PIT-tag technology and data. Adaptive and experimental desert river restoration. Bureau of Land Management & UDWR Watershed Restoration Initiative, Desert Fishes Habitat Partnership. Understanding the Dynamics of Beaver Reintroduction. Watershed Restoration Initiative Lower Price River and Instream Habitat    


I am the Unit Leader of the U.S. Geological Society, Utah Cooperative Fish and Wildlife Unit as well as a Professor of fisheries management and aquatic ecology in the Department of Watershed Sciences at Utah State University (USU).   I hold a B.S. in Limnology from the University of California, Davis and a PhD in Aquatic Ecology from Utah State University.  In conjunction with my research lab, I do research that fits into an overall framework of evaluating the factors that structure and limit fish populations in both lentic and lotic systems, and we also work broadly in conservation biology, invasion ecology, and food web dynamics of aquatic systems.  My current research covers a wide geographical range including almost all of Utah (from the south of the state up to high elevation points in the Bear River drainage), New Mexico, Nevada, Texas, and Alaska and includes many species of salmonids, imperiled native desert fishes, and numerous warm water lentic fishes.  I also dabble in experimental and adaptive stream restoration and large river management.


  • Post-doc, Freshwater Conservation Biology, Colorado State University, University of Puerto Rico, 1997.
  • Ph.D., Aquatic Ecology. Utah State University, Logan, UT. December 1996.
  • B.S., Limnology. University of California, Davis, CA. June 1991.