Cooperative Fish and Wildlife Research Units Program: Maine
Education, Research and Technical Assistance for Managing Our Natural Resources

Maine Staff Member

Margaret Guyette

Margaret Guyette - Bio

Post Doc


  • Ph D University of Maine 2012
  • MS Dartmouth College 2001
  • BA Dartmouth College 1999


I came to the Maine Unit in January 2008 as a Ph.D. student. I completed my Ph.D. in September 2012 and stayed on for a Post-Doctoral research appointment. My dissertation research examined the role of marine-derived nutrients in Atlantic salmon nursery streams in the Penobscot River watershed. Before joining the Maine Unit I spent a number of years as an educator, teaching in high school classrooms and non-traditional settings in Wyoming, Vermont, and Maine. I completed my M.S. at Dartmouth College in 2001, where I explored the effects of acid rock drainage on stream ecosystem structure and metal bioaccumulation in the New World Mining District in Montana. When I'm not working I enjoy organic gardening, biking, running, swimming, bird watching, and cooking. . I am a broadly trained ecologist with a particular interest in taking a systems view when addressing research questions. This approach has led me to develop skills and knowledge in a number of areas. My research experiences include studies connected to spatial ecology, freshwater ecology, stable isotope ecology, ecotoxicology, and ornithology spanning scales from organisms to ecosystems. I am interested in basic and applied research that can add to the knowledge base and help inform managers, policy-makers, and the general public about key issues related to sustainability and ecosystem resilience. My current research involves working with managers at the Okefenokee National Wildlife Refuge (ONWR), in Georgia, to improve understanding of vegetation dynamics in response to fire in Okefenokee Swamp. Vegetation within the ONWR is fire dependent. Wildfires are common and maintain the Okefenokee Swamp in a complex of wetland prairies, shrubs, and forest. In the past 12 years, three extensive fires have swept the swamp, burning nearly 80% of the refuge swamp wetlands. Fine resolution vegetation maps of the refuge and post-fire change assessments indicate that recent fires have reduced vegetation structural complexity in the swamp. Acquiring knowledge about post-fire recovery and burn patterns provides a valuable tool for managing the expansive landscape of ONWR, in particular for characterizing available fuels, determining fuel models, and understanding the potential for vegetation recovery as burn frequency and severity respond to climate dynamics. My post-doctoral research involves two interrelated tasks: a vegetation classification of ONWR and development of a spatially explicit Bayesian belief network (BBN) to forecast vegetation succession under different fire and hydrological condition scenarios. The vegetation classification map is based on satellite imagery captured in 2012, after 75% of the refuge was burned in the 2011 fire season. This map adds to a catalog of vegetation maps developed from aerial photography and satellite imagery over the past several decades and can be used by managers for future fire management planning. The BBN model uses these vegetation maps, 2008, and 2012, fire severity maps developed in 2002, 2007, and 2011, and historical data on precipitation, water level, and fire frequency to spatially relate ecological factors (e.g., fire and hydrology) with vegetation community composition in a Geographic Information System. We are using this model to predict vegetation change under different fire scenarios as projected by regional climate models. The model will help managers understand the potential for vegetation recovery in Okefenokee Swamp under various fire regimes based on climate models.

Research Publications Publication Date
Loftin, C.S., M.Q. Guyette, and P.Wetzel. 2018. Evaluation of vegetation-fire dynamics in the Okefenokee National Wildlife Refuge, Georgia, USA, with Bayesian belief networks. Wetlands 38:819-834. DOI10.1007/s13157-018-1033-6 July 2018
Guyette, M.Q., C.S. Loftin, and J. Zydlewski. (2013) Carcass analog addition enhances juvenile Atlantic salmon (Salmo salar) growth and condition.Canadian Journal of Fisheries and Aquatic Sciences 70:860-870. | Download June 2013
Guyette, M.Q., C.S. Loftin, J. Zydlewski, and R.Cunjak. 2014. Carcass analogues provide marine subsidies for macroinvertebrates and juvenile Atlantic salmon in temperate oligotrophic streams. Freshwater Biology 59:392-406. | Download March 2014
Presentations Presentation Date
Loftin, C.S., and M.Q. Guyette. 2014. A Bayesian belief network assessment of vegetation spatial dynamics in response to fire in the Okefenokee National Wildlife Refuge, Georgia, USA. Presentation at the Joint Aquatic Sciences Meeting, 18-23 May, Portland, OR. May 2014
Guyette, M.Q. and C.S. Loftin. 2013. A Bayesian belief network assessment of vegetation succession and spatial dynamics in response to fire and hydrological conditions in the Okefenokee National Wildlife Refuge, Georgia, USA. Annual meeting of the Ecological Society of Ameica, August 4-9, Minneapolis, MN. August 2013
Technical Publications Publication Date
Quinn, M.R. (maiden name), Feng, X., Folt, C.L., Chamberlain, C.P. 2003. Analyzing trophic transfer of metals in stream food webs using nitrogen isotopes. The Science of the Total Environment 317: 73-89. January 2003