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Dr. Samantha (Mandy) B. Joye
Athletic Association Professor of Arts & Sciences

Mailing Address:
Dr. Mandy Joye
Department of Marine Sciences
University of Georgia
Athens, GA 30602-3636

Office Phone: (706) 542-5893
Lab Phone: (706) 542-6818
FAX Number: (706) 542-5888
Home Page:

The Joye Research Group

Dr. Joye is studying the water column and seafloor impacts of the 2010 BP Gulf of Mexico oil spill. Please visit the 2010 Macondo Well Blowout research for details.

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Ph.D. 1993, University of North Carolina, Chapel Hill, NC

B.Sc. 1987, University of North Carolina, Chapel Hill, NC

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Research Emphasis:

Biogeochemical cycling of nutrients, metals, and organic materials in coastal environments; biogeochemistry of methane hydrate and chemosynthetic habitats; ecosystem and geochemical modeling; microbial ecology, metabolism and physiology; molecular biology; global nitrogen cycle, global methane cycle.

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Joye Publications, 2011 through July 2013

* denotes co-authors from the Joye group

*Schutte, C.A., K.S. Hunter*, P. McKay, D. DiIorio, S.B. Joye, C.D. Meile, 2013. Patterns and controls on nutrient levels in a southeastern United States tidal river. Oceanography (in press).

Dekas, A.E., G. Chadwick, S. Connon, M. Bowles*, S.B. Joye, and V.J. Orphan, 2013. Investigating methane seep nitrogen fixation at Mound 12, Costa Rica: Spatial distribution of diazotrophy and significance of the ANME archaea. Environmental Microbiology (in press).

Feng, D., H.H. Roberts, S.B. Joye, and E. Heydari, 2013. Formation of low-magnesium calcite at cold seeps in an aragonite sea. Terra Nova (in press)

Rivers, A.A., S. Sharma, S. Tringe, J. Martin, S.B. Joye, and M.A. Moran, 2013. Transcriptional response of bathypelagic marine bacteria to the Deepwater Horizon Oil Spill. The ISME Journal, doi:10.1038/ismej.2013.129.

Adams, M.M., A.L. Hoarfrost, A. Bose, S.B. Joye, and P.R. Girguis, 2013. Anaerobic short-chain alkanes in hydrothermal sediments: influences on sulfur cycling and microbial diversity. Frontiers in Microbiology, doi: 10.3389/fmicb.2013.00110

*Segarra, K.E.A., V. Samarkin*, E. King, C. Meile, and S.B. Joye, 2013. Seasonal variations of methane fluxes from a tidal, freshwater sediment (Hammersmith Creek, GA). Biogeochemistry, DOI 10.1007/s10533-013-9840-6.

Peterson, R.N., R.F. Viso, I.R. MacDonald, and S.B. Joye, 2013. On the utility of radium isotopes as tracers of seafloor hydrocarbon discharge. Marine Chemistry,

*Segarra, K.E.A., C. Comerford*, J. Slaughter*, and S.B. Joye, 2013. Impact of electron acceptor availability on the anaerobic oxidation of methane in coastal freshwater and marine sediments. Geochimica et Cosmochimica Acta, 115: 15-30,

Shah, S.R., S.B. Joye, J. Brandes, and A.P. McNichol, 2013. Carbon isotopic evidence for microbial control of carbon supply to Orca Basin, Gulf of Mexico. Biogeosciences, 10: 3175-3183.

*Bowles, M.W., L.M. Nigro, A.P. Teske, and S.B. Joye, 2012. Denitrification and the environmental factors influencing nitrate removal in Guaymas Basin hydrothermally-altered sediments. Frontiers of Microbiology, doi:10.3389/fmicb.2012.00377.

Peterson, C.H., Anderson, S., G. Cherr, R. Ambrose, S. Anghera, S. Bay, M. Blum, R. Condon, T. A. Dean, M. Graham, M. Guzy, S. Hampton, S.B. Joye, J. Lambrinos, B. Mate, D. Meffert, S. P. Powers, C. Reddy, P. Somasundaran, R. B. Spies, C. Taylor, and R. Tjeerdema, 2012. Casual observations on DWH dispersant effects reveal the need for rigorous science. BioScience, 62: 461-469.

Joye, S.B., 2012. A piece of the methane puzzle. Nature, 491: 538-539; doi:10.138/nature11749.

Teixeira, C., C. Magalhaes, S. B. Joye, and A. A. Bordalo, 2012. The role of salinity in shaping dissolved inorganic nitrogen and N2O fluxes at the estuarine sediment-water interface. Marine Pollution Bulletin,

*Bass, P., M.W. Hester, and S.B. Joye, 2013. Benthic primary production and nitrogen cycling in Spartina alterniflora marshes impacted by acute dieback. Biogeochemistry, DOI 10.1007/s10533-013-9897-2.

Orcutt, B.N., R.A. Barco, S.B. Joye, and K.J. Edwards, 2012. Summary of carbon, nitrogen, and iron leaching characteristics and fluorescence properties of materials considered for IODP Expedition 336 subseafloor observatory assembly. IODP Leg 336 Initial Reports, in press.

*Palomo, L., C.D. Meile, and S.B. Joye, 2012. Drought impacts on biogeochemistry and microbial processes in salt marsh sediments: a flow-through reactor approach.  Biogeochemistry, doi 10.1001/s10533-012-9734-z.

Wankel, S., M. Adams, D. Johnstone, S.B. Joye, and P.R. Girguis, 2012. Nature and influence of the anaerobic oxidation of methane in metalliferous hydrothermal sediments. Environmental Microbiology, 14: 2726-2740.

Mendelssohn, I.A., G. Anderson, D. Baltz, R. Caffey, K. Carman, J. Fleegar, S.B. Joye, E. Maltby, E. Overton, and L. Rozas, 2012. Oil impacts to coastal wetland systems: Implications for the Mississippi River Delta Plain Ecosystem after the Deepwater Horizon Oil Discharge. BioScience, 62: 562-574.

*Teixeira, C., C. Magalhaes, S.B. Joye, A.A. Bordalo, 2012.  Rates and environmental controls of anaerobic ammonium oxidation in estuarine sediments. Aquatic Microbial Ecology, doi: 10.3354/ame01548.

Peterson, C.H., Anderson, S., G. Cherr, R. Ambrose, S. Anghera, S. Bay, M. Blum, R. Condon, T. A. Dean, M. Graham, M. Guzy, S. Hampton, S.B. Joye, J. Lambrinos, B. Mate, D. Meffert, S. P. Powers, C. Reddy, P. Somasundaran, R. B. Spies, C. Taylor, and R. Tjeerdema, 2012. A Tale of Two Spills. BioScience, 62:461-469.

Wade, T.L., S.T. Sweet, J.L. Sericano, N.L. Guinasso, A.R. Diercks, R.C. Highsmith, V.L. Asper, D. Joung, A.M. Shiller, S.E. Lorehnz, and S.B. Joye, 2011. Analyses of water samples from the Deepwater Horizon Oil Spill: Documentation of the Sub-Surface Plume. Journal of Geophysical Research: Oceans, Geophysical Monograph Series 195: 77-82.

*Bowles, M.W., V.A. Samarkin*, and S.B. Joye, 2011. Improved measurement of microbial activity in deep-sea sediments at in situ pressure and methane concentration. Limnology and Oceanography: Methods, 9: 499-506.

Joye, S. B., I. Leifer, I. R. MacDonald, J. P. Chanton, C. D. Meile, A. P. Teske, J. E. Kostka, L. Chistoserdova, R. Coffin, D. Hollander, M. Kastner, J. P. Montoya, G. Rehder, E. Solomon, T. Treude and T. A. Villareal, 2011.  Technical Comment on “A Persistent Oxygen Anomaly Reveals the Fate of Spilled Methane in the Deep Gulf of Mexico” by Kessler et al. Science, 27 May 2011, 1033. DOI:10.1126/science.1203307.

Dohm, J.M., H. Miyamoto, G.G. Ori, A.G. Fairen, A.F. Davila, G. Komatsu, W.C. Mahaney, P. Williams, S.B. Joye, and 27 others, 2010. Prime candidate environments for life detection on Mars. Geological Society of America, Frontiers Volume, “Analogs for Planetary Exploration”, Special Paper 483.

Joye, S.B., I.R. MacDonald, I. Leifer, and V. Asper, 2011. Magnitude and oxidation potential of hydrocarbon gases released from the BP blowout. Nature Geoscience, 4: 160-164 (doi:10.1038/ngeo1067).

Wilson, A., W.S. Moore, S.B. Joye, J. Anderson and C. Schutte1, 2010. Storm-driven groundwater flow in a salt marsh. Water Resources Research, doi:10.1029/2010WR009496.

Diercks, A.R., R.C. Highsmith, V.L. Asper, D. Joung, L. Guo, Z. Zhou, A.M. Shiller, S.B. Joye, A.P. Teske, and S.E. Lohrenz, 2010. Characterization of subsurface polycyclic aromatic hydrocarbons at the Deepwater Horizon site. Geophysical Research Letters, 37, L20602, doi:10.1029/2010GL045046.

*Bowles, M.W., V. A. Samarkin*, K. L. M. Bowles, and S.B. Joye, 2010. Weak coupling between sulfate reduction and the anaerobic oxidation of methane in methane-rich seafloor sediments in ex situ incubations. Geochimica et Cosmochimica Acta, doi:10.1016/j.gca.2010.09.043 (in print: 75: 500-519).

Joye, S.B., and I.R. MacDonald, 2010. Offshore oceanic impacts from the BP oil spill. Nature Geoscience, 3:446, doi:10.1038/ngeo902.

Joye, S.B., M.W. Bowles*, V.A. Samarkin*, K.S. Hunter* and H. Niemann, 2010. Biogeochemical signatures and microbial activity of different cold seep habitats along the Gulf of Mexico lower slope. Deep Sea Research, doi:10.1016/j.dsr2.2010.06.001.

Orcutt*, B.N., S.B. Joye, S. Kleindienst, K. Knittel, A. Ramette, A. Reitz, V.A. Samarkin*, T. Truede, and A. Boetius, 2010. Impact of natural oil and higher hydrocarbons on microbial diversity, distribution and activity in Gulf of Mexico cold seep sediments. Deep Sea Research, doi:10.1016/j.dsr2.2010.05.014.

Wankel, S.D., S.B. Joye, V.A. Samarkin*, S. Shah, G. Friderich, J. Melas-Kryiazi, and P.R. Girguis, 2010. New constraints on diffusive methane fluxes and rates of anaerobic methane oxidation in a Gulf of Mexico brine pool through the use of a deep sea in situ mass spectrometer. Deep Sea Research, doi:10.1016/j.dsr2.2010.05.009.

Roberts, H.H., D. Feng, and S.B. Joye, 2010. Cold seep carbonates of the middle and lower continental slope, northern Gulf of Mexico. Deep Sea Research, doi:10.1016/j.dsr2.2010.09.003.

Porubsky*, W.P., S.B. Joye, W.S. Moore, K. Tuncay and C. Meile, 2010. Hammock groundwater flow and biogeochemistry: Field measurements, laboratory assays and predictive modeling. Biogeochemistry, in press.

Tavormina, P.L., W. Ussler, S.B. Joye, S. Giovannoni, and V.J. Orphan, 2010. Intergenic spacer length of particulate methane monooxygenases reveals distributions of microbial methane oxidizers in the mesopelagic ocean. The ISME Journal, doi:10.1016/j.dsr2.2010.09.003.

Feller, I.C., C. Lovelock, K. McKee, U. Berger, S.B. Joye, and M. Ball, 2010. Biocomplexity in Mangrove Ecosystems. Annual Review of Marine Sciences, 2: 395-417.



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