Sulfur and oxygen isotope tracing of sulfate driven anaerobic methane oxidation in estuarine sediments

Gilad Antler, Alexandra V. Turchyn, Barak Herut, Alicia Davies, Victoria C.F. Rennie, Orit Sivan

פרסום מחקרי: פרסום בכתב עתמאמרביקורת עמיתים

תקציר

We use multiple stable isotope measurements in two highly stratified estuaries located along the Mediterranean coast of Israel (the Yarqon and the Qishon) to explore the consumption of sulfate through the anaerobic oxidation of methane (sulfate-driven AOM). At both sites, pore fluid sulfate is rapidly consumed within the upper 15-20cm. Although the pore fluid sulfate and dissolved inorganic carbon (DIC) concentration profiles change over a similar range with respect to depth, the sulfur and oxygen isotopes in the pore fluid sulfate and the carbon isotopes in the pore fluid DIC are fundamentally different. This pore fluid isotope geochemistry indicates that the microbial mechanism of sulfate reduction differs between the studied sites. We suggest that in the Yarqon estuary, sulfate is consumed entirely through AOM, whereas in the Qishon, both AOM and bacterial sulfate reduction through organic matter oxidation coexist. These results have implications for understanding the microbial mechanisms behind sulfate-driven AOM. Our data compilation from marine and marginal marine environments supports the conclusion that the intracellular pathways of sulfate reduction varies among environments with sulfate-driven AOM. The data can be used to elucidate new pathways in the cycling of methane and sulfate, and the findings are applicable to the broader marine environment.

שפה מקוריתאנגלית אמריקאית
עמודים (מ-עד)4-11
מספר עמודים8
כתב עתEstuarine, Coastal and Shelf Science
כרך142
מזהי עצם דיגיטלי (DOIs)
סטטוס פרסוםפורסם - 1 אפר׳ 2014

ASJC Scopus subject areas

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טביעת אצבע

להלן מוצגים תחומי המחקר של הפרסום 'Sulfur and oxygen isotope tracing of sulfate driven anaerobic methane oxidation in estuarine sediments'. יחד הם יוצרים טביעת אצבע ייחודית.

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