Sulfur bacteria promote dissolution of authigenic carbonates at marine methane seeps
| Autor: | Peter R. Girguis, Dalton J. Leprich, Beverly E. Flood, Elizabeth Ricci, Jeffery J. Marlow, Peter R. Schroedl, Jake V. Bailey |
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| Rok vydání: | 2020 |
| Předmět: |
Water microbiology
Geologic Sediments 010504 meteorology & atmospheric sciences Carbonates chemistry.chemical_element Biology engineering.material 01 natural sciences Microbiology Methane Article Microbial ecology 03 medical and health sciences chemistry.chemical_compound Rhodobacteraceae Dissolution Ecology Evolution Behavior and Systematics 030304 developmental biology 0105 earth and related environmental sciences 0303 health sciences Aragonite Authigenic Biogeochemistry Sulfur Petroleum seep chemistry Solubility Environmental chemistry Biofilms engineering Carbonate rock Carbonate Oxidation-Reduction |
| Zdroj: | The ISME Journal |
| ISSN: | 1751-7370 |
| Popis: | Carbonate rocks at marine methane seeps are commonly colonized by sulfur-oxidizing bacteria that co-occur with etch pits that suggest active dissolution. We show that sulfur-oxidizing bacteria are abundant on the surface of an exemplar seep carbonate collected from Del Mar East Methane Seep Field, USA. We then used bioreactors containing aragonite mineral coupons that simulate certain seep conditions to investigate plausible in situ rates of carbonate dissolution associated with sulfur-oxidizing bacteria. Bioreactors inoculated with a sulfur-oxidizing bacterial strain, Celeribacter baekdonensis LH4, growing on aragonite coupons induced dissolution rates in sulfidic, heterotrophic, and abiotic conditions of 1773.97 (±324.35), 152.81 (±123.27), and 272.99 (±249.96) μmol CaCO3 • cm−2 • yr−1, respectively. Steep gradients in pH were also measured within carbonate-attached biofilms using pH-sensitive fluorophores. Together, these results show that the production of acidic microenvironments in biofilms of sulfur-oxidizing bacteria are capable of dissolving carbonate rocks, even under well-buffered marine conditions. Our results support the hypothesis that authigenic carbonate rock dissolution driven by lithotrophic sulfur-oxidation constitutes a previously unknown carbon flux from the rock reservoir to the ocean and atmosphere. |
| Databáze: | OpenAIRE |
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