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In Review or Revision

Wankel, SD, AS Bradley, D Eldridge, and DT Johnston.  In revision.  Determination and application of the equilibrium oxygen isotope effect between water and sulfite. Geochimica Cosmochimica Acta.

In Press

Liao, L, SD Wankel, CM Cavanaugh and PR Girguis.  In press.  Respiration or assimilation:  Nitrogen metabolism in the vestimentiferan tubeworm Ridgeia piscesae symbiosis.  Molecular Ecology.



Wankel SD, Y Huang, M Gupta, R Provencal, and C Vidoudez, PR Girguis. 2013. In situ stable isotopic detection of anaerobic oxidation of methane in Monterey Bay cold seeps via off-axis integrated cavity output spectroscopy. Environmental Science and Technology. 47:1478-1486.  doi:10.1021/es303661w.


Lentini C, SD Wankel and CM Hansel.  2012.  Linkages between carbon and iron biogeochemistry:  Insights from a variety of iron oxide enrichment culturingEnriched iron(III)-reducing bacterial communities are shaped by carbon substrate and iron oxide mineralogy. Frontiers in Microbiological Chemistry. 3:404 doi:10.3389/fmcib.2012.00404

Wankel SD, MA Adams, DT Johnston, CM Hansel, SB Joye and PR Girguis. 2012. Anaerobic methane oxidation in metalliferous hydrothermal vent sediments:  Influence of carbon flux and decoupling from sulfate reduction. Environmental Microbiology. doi:10.1111/j.1462-2920.2012.02825.x


Wankel, SD
, L Germanovich, M Lilley, G Genc, CJ DiPerna, E Olson and PR Girguis. 2011. Geochemical flux and metabolic activity associated with the deep hydrothermal subsurface. Nature Geoscience. 4:461-468.

Learman DR, SD Wankel, SM Webb, N Martinez, AS Madden, and CM Hansel.  2011.  Coupled Biotic-Abiotic Mn(II) Oxidation Pathway Mediates the Formation and Structural Evolution of Biogenic Mn Oxides. Geochimica et Cosmochimica Acta. 75:6048-6063.

Peterson JM, FU Zielinski, T Pape, R Siefert, C Moraru, R Amann, S Hourdez, PR Girguis, SD Wankel, V Barbe, E Pelletier, D Fink, C Borowski, and N Dubilier. 2011. A novel energy source for chemosynthetic symbioses:  Hydrothermal vent mussels powered by hydrogen. Nature. 476:176-180.

Wankel, SD, A Mosier, CM Hansel, A Paytan, and CA Francis.2011. Diversity, abundance and activity of ammonia-oxidizing archaea and bacteria in coastal estuarine sediments of Elkhorn Slough, CA.  Applied and Environmental Microbiology.  77(1):269-280.


Wankel, SD,SB Joye, VA Samarkin, SR Shah, G Friederich, J Melas-Kyriazi, and PR Girguis.  2010.  New constraints on methane fluxes and rates of anaerobic methane oxidation in a Gulf of Mexico brine pool via in situ mass spectrometry. Deep Sea Research II.  57:2022-2029.

Wankel, SD, Y Chen, C Kendall, and A Paytan. 2010. Sources of aerosol nitrate to the Gulf of Aqaba:  Evidence from δ15N and δ18O of nitrate and trace metal chemistry. Marine Chemistry120(1-4):90-99.


Wankel, SD, C Kendall, and A Paytan.  2009. Using nitrate dual isotopic composition (δ15N and δ18O) as a tool for exploring sources and cycling of nitrate in an estuarine system:  Elkhorn Slough, CA.  Journal of Geophysical Research – Biogeosciences.  114(G01011): 10.1029/2008JG000729.


Wankel, SD, A. Paytan, C. Kendall, TF Pennington, and F. Chavez.  2007.  Nitrification in the euphotic zone as evidenced by nitrate dual isotopic composition:  Observations from Monterey Bay, California. Global Biogeochemical Cycles.   21(2): 10.1029/2006GB002723.

Derse E, K Knee, SD Wankel, C Kendall and A. Paytan,.  2007.  Identifying the sources of nitrogen to Hanalei Bay, Kauai utilizing the nitrogen isotope signature of macroalgae. Environmental Science and Technology. 41(15): 5217-5223.

Elliott, EM, C Kendall, SD Wankel, EW Boyer, DA Burns, DJ Bain, K Harlin, TJ Butler, and R Carlton.  2007.  An Isotopic Tracer of Stationary Source NOx Emissions Across the Midwestern and Northeastern United States.  Environmental Science and Technology.  41(22): 7661-7667.

Ewing SA, GM Michalski, M Thiemens, RC Quinn, JL Macalady, S Kohl, SD Wankel, C Kendall, CP McKay, and R Amundson.  2007.  The rainfall limit of the nitrogen cycle on earth.  Global Biogeochemical Cycles21(3): 10.1029/2006GB002838.

Kendall, C, EM Elliott and SD Wankel.  2007.  Stable isotopic composition of nitrogen-bearing compounds in the environment:  Tracers for sources and cycling.  In Stable Isotopes in Ecology and Environmental Science.  K Lajtha and RH Michener (eds.).  Blackwell Scientific Publications, Oxford.

Leichter, JL, A Paytan, SD Wankel, K Hanson, S Miller, and M Altabet.  2007.  Nitrogen and oxygen isotopic signatures of subsurface nitrate:  Evidence of deep water nutrient sources to the Florida Keys reef tract.  Limnology and Oceanography. 52:1258-1267.

Ruehl C, AT Fisher, M Los Huertos, SD Wankel, CG Wheat, C Kendall, C Hatch, and C Shennan.  2007.  Nitrate dynamics within the Pajaro River, a nutrient rich, losing stream.  Journal of the North American Benthological Society26(2):191-206.


Wankel SD, C Kendall, CA Francis, and A Paytan.  2006.  Nitrogen sources and cycling in the San Francisco Bay Estuary: A nitrate dual isotopic composition approach.  Limnology and Oceanography51(4): 1654-1664.


Chang, C, SR Silva, C Kendall, GM Michalski, KL Casciotti, and SD Wankel.  2005.  Preparation and analysis of nitrogen-bearing compounds in water for stable isotope ratio measurement.  In Handbook of Stable Isotope Analytical Techniques.  PA de Groot (ed.).  Chapter 15.  Elsevier.


Paytan, A, F Martinez-Ruiz, M Eagle, A Ivy, and SD Wankel.  2004.  Using sulfur isotopes to elucidate the origin of barite associated with high organic matter accumulation events in marine sediments in Amend JP, Edwards KJ, and Lyons TW eds. Sulfur Biogeochemistry – Past and Present: Boulder, Colorado, Geological Society of America Special Paper 379,  p. 151-160.

Ohte, N, SD Sebestyen, JB Shanley, DH Doctor, C Kendall C, SD Wankel, and EW Boyer.  2004.  Tracing sources of nitrate in snowmelt using a high-resolution isotopic technique.  Geophysical Research Letters. 31, L21506, doi:10.1029/2004GL020908.


Rumbold, DG, LE Fink, KA Laine, SL Niemczyk, T Chandrasekhar, SD Wankel, and C Kendall.  2002.  Levels of mercury in alligators (Alligator mississippiensis) collected along a transect through the Florida Everglades.  The Science of the Total Environment, 297(103):239-252.


Non-Peer-Reviewed Publications



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Last updated June 3, 2013
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