Tracing microbial carbon sources in hydrothermal sediments by C isotopic analysis of bacterial and archaeal ribosomal RNA.
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| Natura: | Artículo científico |
| Lingua: | en |
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Frontiers in microbiology
2025
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| author | MacGregor, Barbara Boschker, Henricus T S Hoer, Daniel Albert, Daniel B Mendlovitz, Howard Teske, Andreas |
| author_facet | MacGregor, Barbara Boschker, Henricus T S Hoer, Daniel Albert, Daniel B Mendlovitz, Howard Teske, Andreas MacGregor, Barbara Boschker, Henricus T S Hoer, Daniel Albert, Daniel B Mendlovitz, Howard Teske, Andreas |
| collection | PubMed - marine biology |
| contents | Tracing microbial carbon sources in hydrothermal sediments by C isotopic analysis of bacterial and archaeal ribosomal RNA. MacGregor, Barbara Boschker, Henricus T S Hoer, Daniel Albert, Daniel B Mendlovitz, Howard Teske, Andreas Microbial communities in hydrothermal sediments of Guaymas Basin assimilate a wide range of carbon sources, detrital organic matter, DIC of hydrothermal and water column origin, as well as methane, light alkanes and petroleum hydrocarbons. Here we analyze the abundances and C-isotopic values of these carbon pools, and assess the relative importance of these carbon sources by comparison with δC-isotopic composition of bacterial and archaeal rRNA. In almost all hydrothermal sediments, δC-rRNA values for bacterial and archaea are lighter (more C-depleted) than those of TOC and DIC, indicating that carbon from C-depleted methane permeates the microbial food web, with no systematic preference for bacteria or archaea. However, the omnipresence of detrital organic matter of photosynthetic origin means that any methane signal in bacterial and archaeal δC-rRNA values is diluted by the heterotrophic background. In non-hydrothermal background sediment where methane is lacking, the δC-rRNA values for bacterial and archaea are heavier (less C-depleted) and indicate the preferential utilization of detrital TOC of photosynthetic origin. The presence of petroleum in some methane-rich hydrothermal cores does not visibly change the δC-rRNA values for bacterial and archaea, since the δC-isotopic composition of hydrothermal petroleum in Guaymas Basin is similar to its source, detrital organic carbon, and thus does not separate fossil carbon utilizers from general heterotrophs. When δC-depleted methane competes with high concentrations of δC-repleted (heavier) short-chain alkanes, δC-rRNA values for bacteria and archaea are noticeably heavier than those in methane-rich but alkane-poor sediments, suggesting short-chain alkane incorporation. Under alkane-rich conditions, consistent differences between bacterial and archaea δC-rRNA were observed, suggesting the impact of distinct bacterial and archaeal alkane assimilation pathways. To summarize, we note that the availability of different sedimentary or hydrothermal carbon sources-in particular hydrothermal methane-is reflected in changing δC-rRNA values for bacteria and archaea. |
| format | Artículo científico |
| id | pubmed_41178965 |
| institution | PubMed |
| language | en |
| publishDate | 2025 |
| publisher | Frontiers in microbiology |
| record_format | pubmed |
| spellingShingle | Tracing microbial carbon sources in hydrothermal sediments by C isotopic analysis of bacterial and archaeal ribosomal RNA. MacGregor, Barbara Boschker, Henricus T S Hoer, Daniel Albert, Daniel B Mendlovitz, Howard Teske, Andreas Tracing microbial carbon sources in hydrothermal sediments by C isotopic analysis of bacterial and archaeal ribosomal RNA. MacGregor, Barbara Boschker, Henricus T S Hoer, Daniel Albert, Daniel B Mendlovitz, Howard Teske, Andreas Microbial communities in hydrothermal sediments of Guaymas Basin assimilate a wide range of carbon sources, detrital organic matter, DIC of hydrothermal and water column origin, as well as methane, light alkanes and petroleum hydrocarbons. Here we analyze the abundances and C-isotopic values of these carbon pools, and assess the relative importance of these carbon sources by comparison with δC-isotopic composition of bacterial and archaeal rRNA. In almost all hydrothermal sediments, δC-rRNA values for bacterial and archaea are lighter (more C-depleted) than those of TOC and DIC, indicating that carbon from C-depleted methane permeates the microbial food web, with no systematic preference for bacteria or archaea. However, the omnipresence of detrital organic matter of photosynthetic origin means that any methane signal in bacterial and archaeal δC-rRNA values is diluted by the heterotrophic background. In non-hydrothermal background sediment where methane is lacking, the δC-rRNA values for bacterial and archaea are heavier (less C-depleted) and indicate the preferential utilization of detrital TOC of photosynthetic origin. The presence of petroleum in some methane-rich hydrothermal cores does not visibly change the δC-rRNA values for bacterial and archaea, since the δC-isotopic composition of hydrothermal petroleum in Guaymas Basin is similar to its source, detrital organic carbon, and thus does not separate fossil carbon utilizers from general heterotrophs. When δC-depleted methane competes with high concentrations of δC-repleted (heavier) short-chain alkanes, δC-rRNA values for bacteria and archaea are noticeably heavier than those in methane-rich but alkane-poor sediments, suggesting short-chain alkane incorporation. Under alkane-rich conditions, consistent differences between bacterial and archaea δC-rRNA were observed, suggesting the impact of distinct bacterial and archaeal alkane assimilation pathways. To summarize, we note that the availability of different sedimentary or hydrothermal carbon sources-in particular hydrothermal methane-is reflected in changing δC-rRNA values for bacteria and archaea. |
| title | Tracing microbial carbon sources in hydrothermal sediments by C isotopic analysis of bacterial and archaeal ribosomal RNA. |
| url | https://pubmed.ncbi.nlm.nih.gov/41178965/ |