Ryan McManamay, Ph.D.

Assistant Professor
High Res Photo

Ph.D.  Fish and Wildlife Conservation, Virginia Tech, 2011

M.S.    Biological Sciences, Virginia Tech, 2007

B.S.    Biological Sciences, Clemson University, 2004


2017-2019: Energy-Water-Nexus Theme Lead, Urban Dynamics Institute, Oak Ridge Natl Lab, TN

2016-2019: Team Lead, Integrated Water-Energy-Ecosystems, Oak Ridge Natl Lab, TN

2016-2019: Joint Faculty, Bredesen Center, University of Tennessee Knoxville, TN

2013-2019: Research Scientist, Oak Ridge National Lab, Oak Ridge, TN

2011- 2013: Postdoctoral Research Associate, Oak Ridge National Lab, Oak Ridge, TN


Dr. Ryan McManamay is a spatial ecologist that studies human-environmental systems in order to balance ecosystem and societal needs. Ryan studies large-scale impacts of humans on natural landscapes, particularly energy development, on aquatic ecosystems. His formal training is in stream ecology and fisheries ecology, with emphasis on environmental flows and river restoration. His research evaluates natural and human-induced patterns in hydrology, infrastructure, and impacts to aquatic species, spans a number of scales, and includes both field and modeling analysis at ecosystem, community, and population levels. He also studies novel approaches to conduct biological monitoring and cataloguing biodiversity. One of his specific interests is how to design sustainable future cities with respect to changes to land cover, shifts in regional to global water budgets, and changes in biodiversity. He is a member of the American Geophysical Union, the American Fisheries Society, and an alumni of the Emerging Leaders in Environmental and Energy Policy (ELEEP) group. Ryan serves as an Associate Editor of Transactions of the American Fisheries Society.

Recent News:

McManamay et al. 2018 (PLoS ONE): “ORNL develops new capability to evaluate human-driven change in Eastern U.S. streams”: https://www.ornl.gov/news/ornl-develops-new-capability-evaluate-human-driven-change-eastern-us-streams

“Ryan McManamay: An Aquatic Outlook on Future Energy”: https://www.ornl.gov/blog/eesd-review/ryan-mcmanamay-aquatic-outlook-future-energy

High-resolution modeling assesses impact of cities on river ecosystems: https://www.ornl.gov/news/high-resolution-modeling-assesses-impact-cities-river-ecosystems

“Reviving fish population at White Oak Creek faces barriers” - Knoxville news sentinel - http://archive.knoxnews.com/news/columnists/frank-munger/reviving-fish-population-at-white-oak-creek-faces-barriers--2fe61b83-e087-792b-e053-0100007f4aad-374956671.html

Recent Publications:

McManamay, R.A., C.R. DeRolph, S. Surendran Nair, M. Dumas-Allen. 2019. Spatially explicit land-energy-water future scenarios for cities: Guiding infrastructure transitions for urban sustainability. Renewable and Sustainable Energy Reviews 112: 880-900

DeRolph, C.R., R.A. McManamay, A.M. Morton, S. Surendran Nair. 2019. City energysheds and renewable energy in the United States. Nature Sustainability 2: 412–420

McManamay, R.A., C.R. DeRolph. 2019. A stream classification system for the conterminous United States. Scientific Data 6: 190017 (2019)

Parish, E., B.M. Pracheil, R.A. McManamay, S.L. Curd, C.R. DeRolph, B.T. Smith. 2019. Review of environmental metrics used across multiple sectors and geographies to evaluate the effects of hydropower development. Applied Energy  238:101-118.  https://doi.org/10.1016/j.apenergy.2019.01.038    

McManamay, R.A., J.S. Perkin, H.I. Jager. 2019. Commonalities in stream connectivity restoration alternatives: An attempt to simplify barrier removal optimization. Ecosphere 10(2):e02596. 10.1002/ecs2.2596

McManamay, R.A., F. Linam, T. J. Mathews, M.J. Peterson. 2019. Scaling mercury biodynamics from individuals to populations: implications of an herbivorous fish on mercury cycles in streams. Freshwater Biology  DOI: 10.1111/fwb.13265

Allen, M.R., S.M.A. Zaidi, V. Chandola, A.M. Morton, C.M. Brelsford, R.A. McManamay, B. KC, J. Sanyal, R.N. Stewart, B.L. Bhaduri. 2018. A survey of methods for Energy-Water Nexus knowledge discovery. Big Earth Data. DOI: 10.1080/20964471.2018.1524344.

McManamay R.A., M.J. Troia, C.R. DeRolph, A. Sheldon Olivero, A.R. Barnett, S-C. Kao, M.G. Anderson. 2018. A stream classification system to explore the physical habitat diversity and anthropogenic impacts in riverscapes of the eastern United States. PLoS ONE 13(6): e0198439. https://doi.org/10.1371/journal.pone.0198439

Brewer, S.K., T.A. Worthington, R. Mollenhauer, D.R. Stewart, R.A. McManamay, L. Geurtault, D. Moore. 2018. Synthesizing models useful for ecohydrology and ecohydraulic approaches: An emphasis on integrating models to address complex research questions. Ecohydrology https://doi.org/10.1002/eco.1966

McManamay, R.A, J.G. Smith, R.T. Jett, T.J. Mathews, M.J. Peterson. 2018. Identifying non-reference sites to guide restoration and long-term monitoring. Science of the Total Environment DOI: 10.1016/j.scitotenv.2017.10.107

Troia, M.J., R.A. McManamay. 2017. Completeness and coverage of open-access freshwater fish distribution data in the United States. Diversity and Distributions DOI: 10.1111/ddi.12637

McManamay, R.A., S. Surendran Nair, C.R. DeRolph, B.L. Ruddell, A.M. Morton, R.N. Stewart, M.J. Troia, L. Tran, H. Kim, B.L. Bhaduri. 2017. US cities can manage national hydrology and biodiversity using local infrastructure policy. Proceedings of the National Academy of Sciences 114:  9581–9586. doi: 10.1073/pnas.1706201114

McManamay, R.A., S.K. Brewer, H. Jager, M. Troia. 2016. Organizing environmental flow frameworks to meet US Hydropower mitigation needs. Environmental Management 58: 365-385.

Troia, MJ, R.A. McManamay. 2016. Filling in the Gaps: characterizing spatial, environmental, and temporal coverage of open-access biodiversity data. Ecology and Evolution DOI: 10.1002/ece3.2225

McManamay, R.A., R.T. Jett, M.G. Ryon, S.M. Gregory, S.H. Stratton, M.J. Peterson, 2016.  Dispersal limitations on fish community recovery following long-term water quality remediation. Hydrobiologia DOI: 10.1007/s10750-015-2612-7

McManamay, R.A., C. Oigbokie, S-C. Kao, M.S. Bevelhimer. 2016. A classification of US hydropower dams by their modes of operation.  River Research and Applications DOI: 10.1002/rra.3004

McManamay, R.A., B.K. Peoples, D.J. Orth, C.A. Dolloff, and D.C. Matthews. 2015. Isolating causal pathways between flow and fish in the regulated river hierarchy. Canadian Journal of Fisheries and Aquatic Sciences 72: 1731-1748.

McManamay, R.A., and E.A. Frimpong. 2015.  Hydrologic filtering of fish life history strategies across the US: Implications of streamflow alteration on fish assemblages. Ecological Applications 25: 243-263. http://dx.doi.org/10.1890/14-0247.1

McManamay, R.A., N. Samu, S-C. Kao, M.S. Bevelhimer, and S.C. Hetrick. 2015. A multi-scale spatial approach to address environmental effects of small hydropower development. Environmental Management 55: 217-243.