Marine Biogeochemistry @ UD

Publications

For the most up-to-date list of publications, please visit Google Scholar. Last Update: Sept. 2025

Block, K. R., Arbetman, A., Slotznick, S., Hanson, T. E., Luther III, George W., Shah Walter, S. R. (2025) Influence of carbon source and iron oxide minerals on methane production and magnetic mineral formation in salt marsh sediments. In press at Biogeosciences. Discussion paper: https://doi.org/10.5194/egusphere-2025-822

Rubin, A. M., Shah Walter, S. R., Mohan, J., Carlisle, A. B. (2025) Methods for precipitating plasma proteins for stable isotope analysis of elasmobranch blood. Journal of Experimental Marine Biology and Ecology, 592, 152127. DOI: 10.1016/j.jembe.2025.152127

Shah Walter, S. R., Wood, L. J., Yoshimura, K. M., Gonski, S. F., Cai, W. J., Huber, J. A., Trembath-Reichert, E., Girguis, P. R. (2025) Microbial and abiotic drivers of carbon removal in aged oceanic crust. Geochimica et Cosmochimica Acta, 394, 1-14. DOI: 10.1016/j.gca.2025.02.012

Yoshimura, K. M., Shah Walter, S. R., Tully, B. J., Biddle, J. F. (2025) Highly dynamic archaeal and bacterial communities from the surface to the deep and shallow sediments in the Atlantic Ocean. Environmental Microbiology, 27, e70039. DOI: 10.1111/1462-2920.70039

Guider, J. T., Yoshimura, K. M., Block, K. R., Biddle, J. F., Shah Walter, S. R. (2024) Archaeal Blooms and Busts in an Estuarine Time Series. Environmental Microbiology, 26, e16584. DOI: 10.1111/1462-2920.16584

McNichol, S. M., Quete, F. S., Loeb, S., Teske, A., Shah Walter, S. R., Mahmoudi, N. (2024) Dynamics of carbon substrate competition among heterotrophic microbes. ISME J, 18, wrae018. DOI: 10.1093/ismejo/wrae018

Trembath-Reichert E., Shah Walter S. R., Fontánez Ortiz, M. A., Carter, P. D, Girguis, P. R., Huber, J. A. (2021) Multiple carbon incorporation strategies support microbial survival in cold subseafloor crustal fluids. Science Advances, 7, eabg0153. DOI: 10.1126/sciadv.abg0153

LaRowe, D. E., Arndt, S., Bradley, J. A., Estes, E. R., Hoarfrost, A., Lang, S. Q., Lloyd, K. G., Mahmoudi, N., Orsi, W. D., Shah Walter, S. R., Steen, A. D., Zhao, R. (2020) The fate of organic carbon in marine sediments – new insights from recent data and analysis. Earth-Science Reviews, 204, 103146. DOI: 10.1016/j.earscirev.2020.103146

Shah Walter S. R., Jaekel U., Osterholz H., Fisher A. T., Huber J. A., Pearson A., Dittmar T., Girguis P. R. (2018) Microbial decomposition of marine dissolved organic matter in cool oceanic crust. Nature Geoscience, 11, 334-339. DOI: 10.1038/s41561 018 0109-5

Kusch, S., Shah Walter, S. R., Hemingway, J. D., Pearson A. (2018) Improved chromatography reveals multiple new bacteriohopanepolyol isomers in marine sediments. Organic Geochemistry, 124, 12-21. DOI: 10.1016/j.orggeochem.2018.07.010

Hemingway, J. D., Kusch, S., Shah Walter, S. R., Polik, C. A., Elling, F. J., Pearson, A. (2018) A novel method to measure the 13C composition of intact bacteriohopanepolyols. Organic Geochemistry, 113, 144-147. DOI: 10.1016/j.orggeochem.2018.07.002

Pearson, A., Hurley, S. J., Shah Walter, S. R., Kusch, S. Lichtin, S., Zhang, Y. G. (2016) Stable carbon isotope ratios of intact GDGTs indicate heterogeneous sources to marine sediments. Geochimica et Cosmochimica Acta, 181, 18-35. DOI: 10.1016/j.gca.2016.02.034

Gospodinova, K., McNichol, A. P., Gagnon, A. R., Burton, J. Shah Walter, S. R. (2015) Rapid extraction of dissolved inorganic carbon from seawater and groundwater samples for radiocarbon dating. Limnology and Oceanography Methods, 14, 24-30. DOI: 10.1002/lom3.10066

Shah Walter, S. R., Gagnon, A. R., Roberts, M. L., McNichol, A. P., Lardie Gaylord M. C., Klein, E. (2015) Ultra-small graphitization reactors for ultra-microscale 14C analysis at the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Facility. Radiocarbon, 57, 109-122. DOI: 10.2458/azu_rc.57.18118

Schouten, S., Hopmans, E. C., Rosell-Melé, A., Pearson, A., Adam, P., Bauersachs, T., Bard, E., Bernasconi, S. M., Bianchi, T. S., Brocks, J. J., Carlson, L. T., Castaneda, I. S., Derenne, S., Selver, A. D., Dutta, K., Eglinton, T. I., Fosse, C., Galy, V., Grice, K., Hinrichs, K. U., Huang, Y., Huguet, A., Huguet, C., Hurley, S., Ingalls, A. E., Jia, G., Keely, B., Knappy, C., Kondo, M., Krishnan, S., Lincoln, S., Lipp, J., Mangelsdorf, K., Martinez-Garcia, A., Menot, G., Mets, M., Mollenhauer, G., Ohkouchi, N., Ossebaar, J., Pagani, M., Pancost, R. D., Pearson, E. J., Peterse, F., Reichart, G. J., Schaffer, P., Schmitt, G., Schwark, L., Shah, S. R., Smith, R. W., Smittenberg, R. H., Summons, R. E., Takano, Y., Talbot, H. M., Taylor, K. W. R., Tarozo, R., Uchida, M., van Dongen, B. E., Van Mooy, B. A. S., Wang, J., Warren, C., Weijers, J. W. H., Werne, J. Woltering, M., Xie, S., Yamamoto, M., Yang, H., Zhang, C. L., Zhang, Y., Zhao, M., Sinninghe Damsté, J. S. (2013) An interlaboratory study of TEX86 and BIT analysis of sediments, extracts and standard mixtures. Geochemistry, Geophysics, Geosystems, 14, 5263-5285. DOI: 10.1002/2013GC004904

Ussler, W., Preston, C., Tavormina, P., Pargett, D., Jensen, S., Roman, B., Marin, R., Shah, S. R., Girguis, P. R., Birch, J. M., Orphan, V., Scholin, C. (2013) Autonomous application of quantitative PCR in the deep sea: In situ surveys of aerobic methanotrophs using the deep-sea environmental processor. Environmental Science and Technology, 47, 9339–9346. DOI: 10.1021/es4023199

Shah, S. R., Griffith, D. R., McNichol, A. P., Galy V., Eglinton, T. I. (2013) Prominent bacterial heterotrophy and sources of 13C-depleted fatty acids to the interior Canada Basin. Biogeosciences, 10, 7065–7080. DOI: 10.5194/bg-10-7065-2013

Close, H. G., Shah, S. R., Ingalls, A. E., Diefendorf, A. F., Brodie, E. L., Hansman, R. L., Freeman, K. H., Aluwihare, L. I., Pearson, A. (2013) Export of submicron particulate organic matter to mesopelagic depth in an oligotrophic gyre. Proceedings of the National Academy of Sciences, 110, 12565-12570. DOI: 10.1073/pnas.1217514110

Shah, S. R., Joye, S. B., Brandes, J. A., McNichol, A. P. (2013) Carbon isotopic evidence for microbial control of carbon supply to Orca Basin, Gulf of Mexico at the seawater-brine interface. Biogeosciences, 10, 3175-3183. DOI: 10.5194/bg-10-3175-2013

Wankel, S. D., Joye, S. B., Samarkin, V. A., Shah, S. R., Friederich, G., Melas-Kyriazi, J., Girguis, P. R. (2010) New constraints on diffusive methane fluxes and rates of anaerobic methane oxidation in a Gulf of Mexico brine pool via deep sea in situ mass spectrometry. Deep Sea Research I, 57, 2022-2029. DOI: 10.1016/j.dsr2.2010.05.009

Liu, Z., Pagani, M., Zinniker, D., DeConto R., Huber, M., Brinkhuis H., Shah, S. R., Lecki R. M., Pearson, A. (2009) Global cooling during the Eocene-Oligocene Climate Transition. Science, 323, 1187-1190. DOI: 10.1126/science.1166368

Schouten, S., Hopmans, E. C., van der Meer, J., Mets, A., Bard, E., Bianchi, T. S., Diefendorf A., Escala M., Freeman, K. H., Furukawa, Y., Huguet C., Ingalls A., Menot-Combes G., Nederbragt, A. J., Oba, M., Pearson, A., Pearson, E. J., Rosell-Mele, A., Schaeffer, P., Shah, S. R., Shanahan, T. M., Smith, R. W., Smittenberg, R., Talbot, H. M., Uchida, M., Van Mooy, B. A. S., Yamamoto, M., Zhang Z. H. and Sinninghe Damsté, J. S. (2009) An interlaboratory study of TEX86 and BIT analysis using high-performance liquid chromatography–mass spectrometry. Geochemistry, Geophysics, Geosystems, 10, Q03012. DOI:10.1029/2008GC002221

Shah, S. R., Mollenhauer G., Ohkouchi N., Eglinton, T. I., Pearson, A. (2008) Origins of archaeal tetraether lipids in sediments: Insights from radiocarbon analysis. Geochimica et Cosmochimica Acta, 72, 4577-4594. DOI: 10.1016/j.gca.2008.06.021

Shah, S. R., Pearson, A. (2007) Ultra-microscale (5-25µg C) analysis of individual lipids by 14C AMS: Assessment and correction for sample processing blanks. Radiocarbon, 49, 69-82. DOI: 10.1017/S0033822200041904

Ingalls, A. E.*, Shah, S. R.*, Hansman, R. L., Aluwihare, L. I., Santos, G. M., Druffel, E. R. M., Pearson, A. † (2006) Quantifying archaeal community autotrophy in the mesopelagic ocean using natural radiocarbon. Proceedings of the National Academy of Sciences, 103, 6442-6447. *contributed equally, DOI: 10.1073/pnas.0510157103