Geochemical and quinone biomarker concentrations in the Black Sea water column and sediments
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| Sprache: | en |
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PANGAEA
2018
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| author | Becker, Kevin W Elling, Felix J Schröder, Jan Martin Lipp, Julius S Goldhammer, Tobias Zabel, Matthias Elvert, Marcus Overmann, Jörg Hinrichs, Kai-Uwe |
| author_facet | Becker, Kevin W Elling, Felix J Schröder, Jan Martin Lipp, Julius S Goldhammer, Tobias Zabel, Matthias Elvert, Marcus Overmann, Jörg Hinrichs, Kai-Uwe |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The stratified water column of the Black Sea serves as a model ecosystem for studying the interactions of microorganisms with major biogeochemical cycles. Here, we provide detailed analysis of isoprenoid quinones to study microbial redox processes in the ocean. In a continuum from the photic zone through the chemocline into deep anoxic sediments of the southern Black Sea, diagnostic quinones and inorganic geochemical parameters indicate niche segregation between redox processes and corresponding shifts in microbial community composition. Quinones specific for oxygenic photosynthesis and aerobic respiration dominate oxic waters, while quinones associated with thaumarchaeal ammonia oxidation and bacterial methanotrophy, respectively, dominate a narrow interval in suboxic waters. Quinone distributions indicate highest metabolic diversity within the anoxic zone, with anoxygenic photosynthesis being a major process in its photic layer. In the dark anoxic layer, quinone profiles indicate the occurrence of bacterial sulfur and nitrogen cycling, archaeal methanogenesis, and archaeal methanotrophy. Multiple novel ubiquinone isomers, possibly originating from unidentified intra-aerobic anaerobes, occur in this zone. The respiration modes found in the anoxic zone continue into shallow subsurface sediments, but quinone abundances rapidly decrease within the upper 50 cm below the sea floor, reflecting the transition to lower energy availability. In the deep subseafloor sediments, quinone distributions and geochemical profiles indicate archaeal methanogenesis/methanotrophy and potentially bacterial fermentative metabolisms. We observed that sedimentary quinone distributions track lithology, which supports prior hypotheses that deep biosphere community composition and metabolisms are determined by environmental conditions during sediment deposition. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_895911 |
| institution | PANGAEA |
| language | en |
| publishDate | 2018 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemical and quinone biomarker concentrations in the Black Sea water column and sediments Becker, Kevin W Elling, Felix J Schröder, Jan Martin Lipp, Julius S Goldhammer, Tobias Zabel, Matthias Elvert, Marcus Overmann, Jörg Hinrichs, Kai-Uwe Center for Marine Environmental Sciences; DARCLIFE; Deep subsurface Archaea: carbon cycle, life strategies, and role in sedimentary ecosystems; MARUM The stratified water column of the Black Sea serves as a model ecosystem for studying the interactions of microorganisms with major biogeochemical cycles. Here, we provide detailed analysis of isoprenoid quinones to study microbial redox processes in the ocean. In a continuum from the photic zone through the chemocline into deep anoxic sediments of the southern Black Sea, diagnostic quinones and inorganic geochemical parameters indicate niche segregation between redox processes and corresponding shifts in microbial community composition. Quinones specific for oxygenic photosynthesis and aerobic respiration dominate oxic waters, while quinones associated with thaumarchaeal ammonia oxidation and bacterial methanotrophy, respectively, dominate a narrow interval in suboxic waters. Quinone distributions indicate highest metabolic diversity within the anoxic zone, with anoxygenic photosynthesis being a major process in its photic layer. In the dark anoxic layer, quinone profiles indicate the occurrence of bacterial sulfur and nitrogen cycling, archaeal methanogenesis, and archaeal methanotrophy. Multiple novel ubiquinone isomers, possibly originating from unidentified intra-aerobic anaerobes, occur in this zone. The respiration modes found in the anoxic zone continue into shallow subsurface sediments, but quinone abundances rapidly decrease within the upper 50 cm below the sea floor, reflecting the transition to lower energy availability. In the deep subseafloor sediments, quinone distributions and geochemical profiles indicate archaeal methanogenesis/methanotrophy and potentially bacterial fermentative metabolisms. We observed that sedimentary quinone distributions track lithology, which supports prior hypotheses that deep biosphere community composition and metabolisms are determined by environmental conditions during sediment deposition. |
| title | Geochemical and quinone biomarker concentrations in the Black Sea water column and sediments |
| topic | Center for Marine Environmental Sciences; DARCLIFE; Deep subsurface Archaea: carbon cycle, life strategies, and role in sedimentary ecosystems; MARUM |
| url | https://doi.org/10.1594/PANGAEA.895911 |