Sasha C Reed, Ph.D.
Dr. Sasha Reed is an ecologist focused on understanding how our planet's ecosystems work and what factors determine the services they provide. The study sites and methods Sasha uses are diverse, and with each of her projects she strives to provide scientific information that helps our nation address challenges, solve problems, and maximize opportunities.
Sasha seeks to provide useful information for land managers, policy-makers, and the general public. Sasha uses both basic and applied scientific approaches to improve our understanding of the fundamental controls over ecosystems, to determine how these systems respond to change, and to explore solutions for addressing relevant problems. Sasha works closely with a range of collaborators - including federal agency partners (BLM, NPS, DOE, DoD, BIA, USFS, USFWS) - in designing research studies, conducting information and technology transfer, and performing outreach activities. Some of her primary research interests include understanding how drought and increasing temperatures affect ecosystems, exploring a diversity of energy options for meeting national demand, assessing the consequences of exotic plant invasion and ways to combat them, and establishing novel management options for increased effectiveness and efficiency in restoration and reclamation. Sasha attempts to conduct research that is innovative, collaborative, and useful.
Professional Experience
Research Ecologist, USGS, Southwest Biological Science Center, Moab, UT: May 2008 - present
Research Ecologist, USGS-SCEP Program, Moab, UT: 2005 - 2007 summers only
Fellow, NSF Graduate Research Fellowship: Awarded April 2003; deferred until September 2005-May 2008
Fellow, National Science Foundation IGERT Fellowship, Carbon Climate and Society Initiative (CCSI): August 2003-August 2005.
Education and Certifications
Ph.D. in Biogeochemistry, 2002-2008: University of Colorado at Boulder, Department of Ecology & Evolutionary Biology and Institute of Arctic & Alpine Research (INSTAAR).
B.A. in Organic Chemistry, 1993-1997: Colgate University, Department of Chemistry, Hamilton, NY. Graduated magna cum laude.
Honors and Awards
Elected Member-At-Large, Ecological Society of America (ESA). August 2020-August 2022.
Ecological Society of America (ESA) Early Career Fellow. March 2016.
Presidential Early Career Award for Scientists and Engineers (PECASE). October 2011.
Star Award, Department of the Interior. October 2010, May 2000.
Graduate Student Research and Creative Works Award, University of Colorado at Boulder. May 2008.
USGS Student Career Experience Program (SCEP) Fellowship. June-August of 2006 & 2007.
Student Policy Award, Ecological Society of America (ESA). September 2006.
AAAS Program for Excellence in Science. August 2006.
Lawrence Award. April 1996.
Phi Ea Sigma University Honor Society Awarded Membership. April 1994-May 1997.
Phi Eta Sigma Aid Committee Selected Board Member. September 1995-May 1997.
Barry Goldwater Award Nominee. November 1994.
Science and Products
Biocrusts: The living skin of the Earth
Beyond traditional ecological restoration on the Colorado Plateau
Patterns of longer-term climate change effects on CO2 efflux from biocrusted soils differ from those observed in the short term
Climatic sensitivity of dryland soil CO2 fluxes differs dramatically with biological soil crust successional state
Science at the frontier: Multimethod research to evaluate ecosystem change across multiple scales
Ecosystem thresholds, tipping points, and critical transitions
Temperate and tropical forest canopies are already functioning beyond their thermal thresholds for photosynthesis
Infrared heater system for warming tropical forest understory plants and soils
Isotopic evidence that nitrogen enrichment intensifies nitrogen losses to the atmosphere from subtropical mangroves
Agriculture
Grasslands
Reviews and syntheses: Field data to benchmark the carbon cycle models for tropical forests
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
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Biocrusts: The living skin of the Earth
Biological soil crusts (biocrusts) form a “living skin” at the soil surface in many low productivity ecosystems around the world including water- and cold-limited environments, and early successional seres (Belnap et al. 2003). They may be composed of any configuration of soil surface-dwelling cyanobacteria, eukaryotic algae, lichens, mosses or liverworts, and support assemblages of decomposers anAuthorsMatthew A. Bowker, Sasha C. Reed, Fernando T. Maestre, David J. EldridgeBeyond traditional ecological restoration on the Colorado Plateau
The Colorado Plateau is one of North America's five major deserts, encompassing 340,000 km2 of the western U.S., and offering many opportunities for restoration relevant to researchers and land managers in drylands around the globe. The Colorado Plateau is comprised of vast tracts of public land managed by local, state, and federal agencies that oversee a wide range of activities (e.g., mineral anAuthorsDaniel E. Winkler, Dana M. Backer, Jayne Belnap, John B. Bradford, Bradley J. Butterfield, Stella M. Copeland, Michael C. Duniway, Akasha M. Faist, Stephen E. Fick, Scott L. Jensen, Andrea T. Kramer, Rebecca Mann, Robert Massatti, Molly L. McCormick, Seth M. Munson, Peggy Olwell, Steve D. Parr, Alix Pfennigwerth, Adrienne M. Pilmanis, Bryce A. Richardson, Ella Samuel, Kathy See, Kristina E. Young, Sasha C. ReedPatterns of longer-term climate change effects on CO2 efflux from biocrusted soils differ from those observed in the short term
Biological soil crusts (biocrusts) are predicted to be sensitive to the increased temperature and altered precipitation associated with climate change. We assessed the effects of these factors on soil carbon dioxide (CO2) balance in biocrusted soils using a sequence of manipulations over a 9-year period. We warmed biocrusted soils by 2 and, later, by 4°C to better capture updated forecasts of futuAuthorsAnthony Darrouzet-Nardi, Sasha C. Reed, Edmund E. Grote, Jayne BelnapClimatic sensitivity of dryland soil CO2 fluxes differs dramatically with biological soil crust successional state
Arid and semiarid ecosystems make up approximately 41% of Earth’s terrestrial surface and are suggested to regulate the trend and interannual variability of the global terrestrial carbon (C) sink. Biological soil crusts (biocrusts) are common dryland soil surface communities of bryophytes, lichens, and/or cyanobacteria that bind the soil surface together and that may play an important role in reguAuthorsColin Tucker, Scott Ferrenberg, Sasha C. ReedScience at the frontier: Multimethod research to evaluate ecosystem change across multiple scales
Changes in the Earth system occur across the full spectrum of spatial and temporal scales, yet our research approaches to understanding and predicting those changes are typically restricted to a pre-defined window of space and time. For this reason, there is substantial power in integrating different approaches, particularly for research associated with the multifaceted nature of ecosystem responsAuthorsColin Tucker, Dong Yan, Sasha C. Reed, Matthew Dannenberg, William SmithEcosystem thresholds, tipping points, and critical transitions
Abrupt shifts in ecosystems are cause for concern and will likelyintensify under global change (Scheffer et al., 2001). The terms‘thresho lds’, ‘tipping points’, and ‘critical transitions’ have beenused interchangeably to refer to sudden changes in the integrityor state of an ecosystem caused by environmental drivers(Holling, 1973; May, 1977). Threshold-based concepts havesignific antly aided our cAuthorsSeth M. Munson, Sasha C. Reed, Josep Peñuelas, Nathan G. McDowell, Osvaldo E. SalaTemperate and tropical forest canopies are already functioning beyond their thermal thresholds for photosynthesis
Tropical tree species have evolved under very narrow temperature ranges compared to temperate forest species. Studies suggest that tropical trees may be more vulnerable to continued warming compared to temperate species, as tropical trees have shown declines in growth and photosynthesis at elevated temperatures. However, regional and global vegetation models lack the data needed to accurately reprAuthorsAlida C. Mau, Sasha C. Reed, Tana E. Wood, Molly A. CavaleriInfrared heater system for warming tropical forest understory plants and soils
The response of tropical forests to global warming is one of the largest uncertainties in predicting the future carbon balance of Earth. To determine the likely effects of elevated temperatures on tropical forest understory plants and soils, as well as other ecosystems, an infrared (IR) heater system was developed to provide in situ warming for the Tropical Responses to Altered Climate ExperimentAuthorsBruce A. Kimball, Aura M. Alonso-Rodríguez, Molly A. Cavaleri, Sasha C. Reed, Grizelle González, Tana E. WoodIsotopic evidence that nitrogen enrichment intensifies nitrogen losses to the atmosphere from subtropical mangroves
Nitrogen (N) enrichment can have large effects on mangroves’ capacity to provide critical ecosystem services by affecting fundamental functions such as N cycling and primary productivity. However, our understanding of excess N input effects on N cycling in mangroves remains quite limited. To advance our understanding of how N enrichment via water or air pollution affects mangroves, we evaluated whAuthorsCarla Roberta Gonçalves Reis, Sasha C. Reed, Rafael Silva Oliveira, Gabriela Bielefeld NardotoAgriculture
Agricultural production is a fundamental activity conducted on 45% of the U.S. land area, 55% of Mexico’s land area, and 7% of Canada’s land area (World Bank 2016). Because of this vast spatial extent and the strong role that land management plays in how agricultural ecosystems function, agricultural lands and activities represent a large portion of the North American carbon budget. Accordingly, iAuthorsAlexander N. Hristov, Jane M. F. Johnson, Charles W. Rice, Molly E. Brown, Richard T. Conant, Stephen J. Del Grosso, Noel P. Gurwick, C. Alan Rotz, Upendra M. Sainju, R. Howard Skinner, Tristram O. West, Benjamin R. K. Runkle, Henry Janzen, Sasha C. Reed, Nancy Cavallaro, Gyami ShresthaGrasslands
Key findings:Total grassland carbon stocks in the conterminous United States, estimated to be about 7.4 petagrams of carbon (Pg C) in 2005, are projected to increase to about 8.2 Pg C by 2050. Although U.S. grasslands are expected to remain carbon sinks over this period, the uptake rate is projected to decline by about half. In the U.S. Great Plains, land-use and land-cover changes are expected toAuthorsElise Pendall, Dominique Bachelet, Richard T. Conant, Bassil El Masri, Lawrence B. Flanagan, Alan K. Knapp, Jinxun Liu, Shuguang Liu, Sean M. SchaefferReviews and syntheses: Field data to benchmark the carbon cycle models for tropical forests
For more accurate projections of both the global carbon (C) cycle and the changing climate, a critical current need is to improve the representation of tropical forests in Earth system models. Tropical forests exchange more C, energy, and water with the atmosphere than any other class of land ecosystems. Further, tropical-forest C cycling is likely responding to the rapid global warming, intensifyAuthorsDeborah A. Clark, Shinichi Asao, Rosie A. Fisher, Sasha C. Reed, Peter B. Reich, Michael G. Ryan, Tana E. Wood, Xiaojuan YangNon-USGS Publications**
Sullivan, B.W., Alvarez-Clare, S., Castle, S.C., Porder, S., Reed, S.C., Schreeg, L., Townsend, A.R. and Cleveland, C.C., 2014. Assessing nutrient limitation in complex forested ecosystems: alternatives to large‐scale fertilization experiments. Ecology, 95(3), pp.668-681.Cleveland, C.C., Houlton, B.Z., Smith, W.K., Marklein, A.R., Reed, S.C., Parton, W., Del Grosso, S.J. and Running, S.W., 2013. Patterns of new versus recycled primary production in the terrestrial biosphere. Proceedings of the National Academy of Sciences, 110(31), pp.12733-12737.Reed, S.C., Cleveland, C.C. and Townsend, A.R., 2013. Relationships among phosphorus, molybdenum and free-living nitrogen fixation in tropical rain forests: results from observational and experimental analyses. Biogeochemistry, 114(1-3), pp.135-147.Wickings, K., Grandy, A.S., Reed, S.C. and Cleveland, C.C., 2012. The origin of litter chemical complexity during decomposition. Ecology Letters, 15(10), pp.1180-1188.Reed, S.C., 2008. Scaling from molecules to ecosystems: controls over free-living nitrogen fixation in terrestrial ecosystems. ProQuest.Sattin, S.R., Cleveland, C.C., Hood, E., Reed, S.C., King, A.J., Schmidt, S.K., Robeson, M.S., Ascarrunz, N. and Nemergut, D.R., 2009. Functional shifts in unvegetated, perhumid, recently-deglaciated soils do not correlate with shifts in soil bacterial community composition. The Journal of Microbiology, 47(6), pp.673-681.Costello, E.K., Halloy, S.R., Reed, S.C., Sowell, P. and Schmidt, S.K., 2009. Fumarole-supported islands of biodiversity within a hyperarid, high-elevation landscape on Socompa Volcano, Puna de Atacama, Andes. Applied and Environmental Microbiology, 75(3), pp.735-747.Freeman, K.R., Pescador, M.Y., Reed, S.C., Costello, E.K., Robeson, M.S. and Schmidt, S.K., 2009. Soil CO2 flux and photoautotrophic community composition in high‐elevation,‘barren’soil. Environmental Microbiology, 11(3), pp.674-686.Schmidt, S.K., Reed, S.C., Nemergut, D.R., Grandy, A.S., Cleveland, C.C., Weintraub, M.N., Hill, A.W., Costello, E.K., Meyer, A.F., Neff, J.C. and Martin, A.M., 2008. The earliest stages of ecosystem succession in high-elevation (5000 metres above sea level), recently deglaciated soils. Proceedings of the Royal Society of London B: Biological Sciences, 275(1653), pp.2793-2802.Reed, S.C., Cleveland, C.C. and Townsend, A.R., 2008. Tree species control rates of free-living nitrogen fixation in a tropical rain forest. Ecology, 89(10), pp.2924-2934.Reed, S.C., Cleveland, C.C. and Townsend, A.R., 2007. Controls over leaf litter and soil nitrogen fixation in two lowland tropical rain forests. Biotropica, 39(5), pp.585-592.Schmidt, S.K., Costello, E.K., Nemergut, D.R., Cleveland, C.C., Reed, S.C., Weintraub, M.N., Meyer, A.F. and Martin, A.M., 2007. Biogeochemical consequences of rapid microbial turnover and seasonal succession in soil. Ecology, 88(6), pp.1379-1385.Reed, S.C., Seastedt, T.R., Mann, C.M., Suding, K.N., Townsend, A.R. and Cherwin, K.L., 2007. Phosphorus fertilization stimulates nitrogen fixation and increases inorganic nitrogen concentrations in a restored prairie. Applied Soil Ecology, 36(2), pp.238-242.Cleveland, C.C., Reed, S.C. and Townsend, A.R., 2006. Nutrient regulation of organic matter decomposition in a tropical rain forest. Ecology, 87(2), pp.492-503.Bowker, M.A., Reed, S.C., Belnap, J. and Phillips, S.L., 2002. Temporal variation in community composition, pigmentation, and Fv/Fm of desert cyanobacterial soil crusts. Microbial Ecology, 43(1), pp.13-25.Reed, S.C., Capitosti, G.J., Zhu, Z. and Modarelli, D.A., 2001. Photochemical generation and matrix-isolation detection of dimethylvinylidene. The Journal of Organic Chemistry, 66(1), pp.287-299.Reed, S.C. and Modarelli, D.A., 1996. Conformational effects on the excited state 1, 2-hydrogen migration in alkyldiazomethanes. Tetrahedron Letters, 37(40), pp.7209-7212.**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
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