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Biography
Dr. Jorgensen's research program is multidisciplinary, holistic thinking, and features teamwork and collaboration. Co-investigators include zoologists, range scientists, physiologists, soil scientists, biogeochemists, and microbiologists from USGS, Universities, DoD, and several States in addition to Federal personnel. This group has been actively investigating risk associated with chronic exposure of ecosystems to low levels of nitrate, particularly related to atmospheric nitrate deposition, ecosystem interactions and feedback, and aquatic/terrestrial interactions. Dr. Jorgensen has been a primary developer of the Agency's research agenda RE: Ecosystem Restoration. Development of this program has involved a significant effort of representation, consensus building, and collaboration within EPA and among other Federal Agencies, State governments, and universities. He is beginning a new research area that is seeking to incorporate ecological values into Brownfields restorations and redevelopments. Dr. Jorgensen has more than 50 papers either published or in review concerning ecological modeling, mammalian ecology and diversity, ecosystem management and restoration, soil science and biogeochemistry, and avian, herpetofauna, and plant community ecology.
Selected Publications
Jorgensen, E.E. 2004. Small mammal use of microhabitat reviewed. Journal of Mammalogy - In Press.
Tunnell, S.J., D.M. Engle, and E.E. Jorgensen. 2004. Old field successional dynamics following cessation of chronic disturbance. Journal of Vegetation Science - In Press.
Mayer, P.M., S.J. Tunnell, D.M. Engle, E.E. Jorgensen, and P. Nunn. 2004. Invasive grass alters litter decomposition by influencing macro-detritivores. Ecosystems - In Press.
Jorgensen, E.E. and S.L. Yarbrough. 2003. Ecosystem restoration to restore water quality; an unrealized opportunity for practitioners and researchers. USEPA - In Press.
Jorgensen, E.E., S. Holub, G. Silva, P.M. Mayer, A.E. West, M.E. Gonsoulin, S.J. Tunnell, J.E. Clark, J.L. Parsons, D.M. Engle, and E.C. Hellgren. 2003. Sources and estimated load of bioavailable nitrogen attributable to chronic nitrogen exposure and changed ecosystem structure and function. Pages 614-618 In Proceedings of the First Interagency Conference on Research in the Watersheds, Benson, AZ.
Clark, J.E., J.L. Parsons, E.C. Hellgren, and E.E. Jorgensen. 2003. Nitrogen concentration of stomach contents as an index of dietary nitrogen for hispid cotton rats (Sigmodon hispidus). Journal of Mammalogy 84:1399-1409.
Clark, J.E., E.C. Hellgren, E.E. Jorgensen, S.M. Tunnell, D.M. Engle, and D.M. Leslie, Jr. 2003. Population dynamics of hispid cotton rats (Sigmodon hispidus) across a nitrogen amended landscape. Canadian Journal of Zoology 81:994-1003.
Jorgensen, E.E. 2002. Opportunities in nitrogen management research; improving applications for proven technologies and identifying new tools for managing nitrogen flux and input in ecosystems. Advances in Restoration Science; Number 2. USEPA. EPA/600/S-02/003.
Jorgensen, E.E., T.J. Canfield, and P.M. Mayer. 2002. Research needs in riparian buffer restoration. Advances in Restoration Science; Number 1. USEPA. EPA/600/S-02/002.
Jorgensen, E.E. 2002. Small mammals: consequences of stochastic data variation for modeling indicators of habitat suitability for a well-studied resource. Ecological Indicators 1:313-321.
Jorgensen, E.E. 2001. Emission of volatile compounds by seeds under different environmental conditions. American Midland Naturalist 145:419-422.
Jorgensen, E.E., T.J. Canfield, and F.W. Kutz. 2000. Restored riparian buffers as tools for ecosystem restoration in the MAIA; processes, endpoints, and measures of success for water, soil, flora, and fauna. Environmental Monitoring and Assessment 63:199-210.
Jorgensen, E.E. 2000. Dispersal as a mechanism limiting diversity of high latitudes. Biota 1:67-76.
Jorgensen, E.E. and S. Demarais. 1999. Spatial scale dependence of rodent habitat use. Journal of Mammalogy 80:421-429.
Jorgensen, E.E. and S. Demarais. 1999. A comparison of modelling techniques for small mammal diversity. Ecological Modelling 120:1-8.
Demarais, S., D.J. Tazik, P. Guertin, and E.E. Jorgensen. 1999. Disturbance associated with military impacts. Pages 385-396 In L.R. Walker (ed). Ecosystems of disturbed ground. Elsevier Publ., Amsterdam, Holland.
Jorgensen, E.E., S. Demarais, S.M. Sell, and S.P. Lerich. 1998. Modeling habitat suitability for small mammals in Chihuahuan Desert foothills of New Mexico. Journal of Wildlife Management 62:989-996.
Jorgensen, E.E., C. Geron, and G.W. Sewell. 1997. Risk management research plan for ecosystem restoration in watersheds. USEPA. EPA/600/R-97/078.
Jorgensen, E.E. and L.E. Nauman. 1994. Disturbance gradients in wetlands associated with commercial cranberry production in Wisconsin. American Midland Naturalist. 132:152-158.