Dissertation Research
September 2002- current
Advisor: Dr. Jennifer L Tank
Topic: The influence of land use on the role of DOC and DON in stream nutrient processing
Education
B.S., Biology 2002 Virginia Polytechnic Institute and State University
Commonwealth Scholar, Magna Cum Laude.
Undergraduate Research Advisor: Dr. Jackson R. Webster, topic: nutrient limitation of respiration on wood biofilm in streams from New Mexico, North Carolina, and Tennessee.
Research Interests
Biogeochemistry of stream ecosystems: dissolved organic carbon and nitrogen cycling, inorganic nitrogen cycling and transport, whole-stream metabolism in stream ecosystems, anthropogenic impacts on stream ecosystems, stream biofilm respiration and production.
Professional Experience
2006-present Research Assistant- The Nature Conservancy Two Stage Ditch Project, Department of Biological Sciences, University of Notre Dame
2002-2006 Research Assistant- Lotic Intersite Nitrogen eXperiment II , Department of Biological Sciences, University of Notre Dame
2002-present Teaching Assistant, Department of Biological Science, University of Notre Dame
2001 Research Experience for Undergraduates (REU) internship, Stream Ecology Laboratory, Virginia Tech
2000-2002 Laboratory Assistant, Stream Ecology Laboratory, Virginia Tech
2000 Volunteer ANAI Association Leatherback Sea Turtle Conservation Project
Awards/Fellowships
2007 Bayer Fellowship. The influence of land use on the role of DOC and DON in stream nutrient processing.
2006 Center for Aquatic Conservation Graduate Fellowship. The effect of two-stage ditch construction on stream ecosystem function.
2006 North American Benthological Society Presidential Award. The influence of land use on the role of DOC and DON in stream nutrient processing.
2004 Selected participant in Fundamentals of Ecosystem Ecology course, Institute of Ecosystem Studies, Millbrook, NY
2003 Notre Dame Environmental Education and Research (NDEER) symposium Graduate Poster Session Award. Taylor, L.C., J.L.Tank, and G.A.Lamberti. How the addition of salmon carcasses vs. salmon analog affects nutrient export in an Alaskan stream.
Manuscripts in Preparation
Johnson, L.T., C.P. Arango, and J.L.Tank. The effect of land use on DOC and DON uptake in headwater streams. Limnology and Oceanography.
Johnson, L.T., J.L. Tank, and W.K. Dodds. The effect of land use on biofilm nutrient limitation across eight North American biomes. Freshwater Biology.
Johnson, L.T., J.L,Tank, R.O.Hall, P.J. Mulholland. Autochthonous DON production in headwater streams. Ecology.
Johnson, L.T., and J.L. Tank. Diel fluctuations in DOC and DON uptake in streams. Journal of the North American Benthological Society.
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