Sherri L. Johnson

Research Ecologist
U.S.D.A. Forest Service, Pacific Northwest Research Station
541.758.7771
sherrijohnson@fs.fed.us 

PROFESSIONAL PREPARATION
B.A. - University of Montana, Environmental Biology with Honors, 1989
M.S. - University of Oklahoma, Department of Zoology, 1991
Ph.D. - University of Oklahoma, Department of Zoology, 1995
NSF Postdoctoral Fellow , Oregon State University, 1996-1998

APPOINTMENTS
Research Ecologist, USDA Forest Service, Pacific Northwest Research Station, 2001-present
Courtesy Professor, Dept of Forest Science, Oregon State University, 2001-present
Courtesy Professor, Dept of Fisheries and Wildlife, 2001-present
Research Professor, Department of Fisheries and Wildlife, Oregon State University, 1999-2001

PUBLICATIONS (5 most relevant)
Watanabe, M., R.M. Adams,  J.J. Wu, J.P. Bolte, M.M. Cox, S.L. Johnson, W.J. Liss, W.G. Boggess, and J.L. Ebersole. 2005. Toward efficient riparian restoration: integrating economic, physical, and biological models. Journal of Environmental Management 75:93-104.
Johnson, S.L. 2004. Factors influencing stream temperatures in small streams: substrate effects and a shading experiment. Canadian Journal of Fisheries and Aquatic Sciences 61:913-923.
Ashkenas, L.R., S.L. Johnson, S.V. Gregory, J.L. Tank, and W.M. Wollheim. 2004. A stable isotope tracer study of nitrogen uptake and transformation in an old-growth forest stream.  Ecology 85:1725-1739.
Webster, J.R., P.J. Mulholland, J.L. Tank, H.M. Valett, W.K. Dodds, B.J. Peterson, W.B. Bowden, C.N. Dahm, S. Findlay, S.V. Gregory, N.B. Grimm, S.K. Hamilton, S.L. Johnson, E. Marti, W.H. McDowell, J.L. Meyer, D.D. Morrall, S.A. Thomas, and W.M Wollheim. 2003. Factors affecting ammonium uptake in streams: an inter-biome perspective. Freshwater Biology 48:1329-1352.
Johnson, S.L. 2003. Stream temperature: scaling of observations and issues for modelling. Hydrological Processes 17:497-499.

PUBLICATIONS (5 additional)
Hood, E., M.N. Gooseff, and S.L. Johnson. In Press. Characterization of dissolved organic carbon flushing in three small watersheds, Oregon USA.  Journal of Geophyscial Research – Biogeosciences
Crowl, T.A., W.H. McDowell, A.P. Covich, and S.L. Johnson. 2001. Freshwater shrimp effects on detrital processing and nutrients in a tropical headwater stream. Ecology 82:775-783.
Johnson, S.L., and J.A. Jones. 2000. Stream temperature response to forest harvest and debris flows in western Cascades, Oregon. Canadian Journal of Fisheries and Aquatic Sciences 57(supplement 2): 30-39.
Johnson, S.L., F.J. Swanson, G.E. Grant, and S.M. Wondzell. 2000. Riparian forest disturbances by a mountain flood - the influence of floated wood. Hydrological Processes 14: 3031-3050.
Johnson, S.L., and A.P. Covich. 2000. The importance of night-time observations for determining habitat preferences of stream biota. Regulated Rivers: Research and Management 16: 91-99.

SYNERGISTIC ACTIVITIES

  • Interdisciplinary collaboration for study of forest-stream interactions and training of graduate students to conduct long term and group research, Long-Term Ecological Research at H.J. Andrews Experimental Forest (NSF). Undergraduates from groups under-represented in science participate in field work each year.
  • Intersite collaboration and research on nitrogen dynamics in streams through different land use types using 15N as a tracer; development of methods to quantify processes controlling nitrogen uptake and retention in streams. Lotic Intersite Nitrogen Experiment (LINX) (Ashkenas et al. 2004, Webster et al. 2003, Merriam et al. 2002, Mulholland et al. 2002,)
  • Examination of the effects of disturbances on aquatic ecosystems (Johnson et al. 2000, Johnson et al. 1998, Covich et al. 1996) and landscape scale studies (Johnson and Covich 1998, Swanson et al. 1998)
  • Research examining stream temperature dynamics through experiments, reach scale studies and at the landscape scale (Johnson 2004, Johnson 2003, Johnson and Jones 2000) has led to involvement as the lead Peer Review Scientist of EPA Stream Temperature Criteria (http://www.epa.gov/r10earth/temperature.htm) as well as workshops with National Forest and other regional natural resource managers, the creation of new graduate class, and presentations at national and local meetings. REU students have been involved each summer.