Biogeochemical probing of microbial communities in a basalt‐hosted hot spring at Kverkfjöll volcano, Iceland
Abstract We investigated bacterial and archaeal communities along an ice‐fed surficial hot spring at Kverkfjöll volcano—a partially ice‐covered basaltic volcano at Vatnajökull glacier, Iceland, using biomolecular (16S rRNA , apsA , mcrA , amoA , nifH genes) and stable isotope techniques. The hot spr...
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crwiley:10.1111/gbi.12291 2024-09-15T18:07:50+00:00 Biogeochemical probing of microbial communities in a basalt‐hosted hot spring at Kverkfjöll volcano, Iceland Cousins, Claire R. Fogel, Marilyn Bowden, Roxane Crawford, Ian Boyce, Adrian Cockell, Charles Gunn, Matthew NASA Astrobiology Institute Royal Society of Edinburgh W. M. Keck Foundation Leverhulme Trust 2018 http://dx.doi.org/10.1111/gbi.12291 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgbi.12291 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gbi.12291 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Geobiology volume 16, issue 5, page 507-521 ISSN 1472-4677 1472-4669 journal-article 2018 crwiley https://doi.org/10.1111/gbi.12291 2024-08-01T04:22:59Z Abstract We investigated bacterial and archaeal communities along an ice‐fed surficial hot spring at Kverkfjöll volcano—a partially ice‐covered basaltic volcano at Vatnajökull glacier, Iceland, using biomolecular (16S rRNA , apsA , mcrA , amoA , nifH genes) and stable isotope techniques. The hot spring environment is characterized by high temperatures and low dissolved oxygen concentrations at the source (68°C and <1 mg/L (±0.1%)) changing to lower temperatures and higher dissolved oxygen downstream (34.7°C and 5.9 mg/L), with sulfate the dominant anion (225 mg/L at the source). Sediments are comprised of detrital basalt, low‐temperature alteration phases and pyrite, with <0.4 wt. % total organic carbon ( TOC ). 16S rRNA gene profiles reveal that organisms affiliated with Hydrogenobaculum (54%–87% bacterial population) and Thermoproteales (35%–63% archaeal population) dominate the micro‐oxic hot spring source, while sulfur‐oxidizing archaea ( Sulfolobales, 57%–82%), and putative sulfur‐oxidizing and heterotrophic bacterial groups dominate oxic downstream environments. The δ 13 C org (‰ V‐ PDB ) values for sediment TOC and microbial biomass range from −9.4‰ at the spring's source decreasing to −12.6‰ downstream. A reverse effect isotope fractionation of ~3‰ between sediment sulfide (δ 34 S ~0‰) and dissolved water sulfate (δ 34 S +3.2‰), and δ 18 O values of ~ −5.3‰ suggest pyrite forms abiogenically from volcanic sulfide, followed by abiogenic and microbial oxidation. These environments represent an unexplored surficial geothermal environment analogous to transient volcanogenic habitats during putative “snowball Earth” scenarios and volcano–ice geothermal environments on Mars. Article in Journal/Newspaper glacier Iceland Vatnajökull Wiley Online Library Geobiology 16 5 507 521 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract We investigated bacterial and archaeal communities along an ice‐fed surficial hot spring at Kverkfjöll volcano—a partially ice‐covered basaltic volcano at Vatnajökull glacier, Iceland, using biomolecular (16S rRNA , apsA , mcrA , amoA , nifH genes) and stable isotope techniques. The hot spring environment is characterized by high temperatures and low dissolved oxygen concentrations at the source (68°C and <1 mg/L (±0.1%)) changing to lower temperatures and higher dissolved oxygen downstream (34.7°C and 5.9 mg/L), with sulfate the dominant anion (225 mg/L at the source). Sediments are comprised of detrital basalt, low‐temperature alteration phases and pyrite, with <0.4 wt. % total organic carbon ( TOC ). 16S rRNA gene profiles reveal that organisms affiliated with Hydrogenobaculum (54%–87% bacterial population) and Thermoproteales (35%–63% archaeal population) dominate the micro‐oxic hot spring source, while sulfur‐oxidizing archaea ( Sulfolobales, 57%–82%), and putative sulfur‐oxidizing and heterotrophic bacterial groups dominate oxic downstream environments. The δ 13 C org (‰ V‐ PDB ) values for sediment TOC and microbial biomass range from −9.4‰ at the spring's source decreasing to −12.6‰ downstream. A reverse effect isotope fractionation of ~3‰ between sediment sulfide (δ 34 S ~0‰) and dissolved water sulfate (δ 34 S +3.2‰), and δ 18 O values of ~ −5.3‰ suggest pyrite forms abiogenically from volcanic sulfide, followed by abiogenic and microbial oxidation. These environments represent an unexplored surficial geothermal environment analogous to transient volcanogenic habitats during putative “snowball Earth” scenarios and volcano–ice geothermal environments on Mars. |
author2 |
NASA Astrobiology Institute Royal Society of Edinburgh W. M. Keck Foundation Leverhulme Trust |
format |
Article in Journal/Newspaper |
author |
Cousins, Claire R. Fogel, Marilyn Bowden, Roxane Crawford, Ian Boyce, Adrian Cockell, Charles Gunn, Matthew |
spellingShingle |
Cousins, Claire R. Fogel, Marilyn Bowden, Roxane Crawford, Ian Boyce, Adrian Cockell, Charles Gunn, Matthew Biogeochemical probing of microbial communities in a basalt‐hosted hot spring at Kverkfjöll volcano, Iceland |
author_facet |
Cousins, Claire R. Fogel, Marilyn Bowden, Roxane Crawford, Ian Boyce, Adrian Cockell, Charles Gunn, Matthew |
author_sort |
Cousins, Claire R. |
title |
Biogeochemical probing of microbial communities in a basalt‐hosted hot spring at Kverkfjöll volcano, Iceland |
title_short |
Biogeochemical probing of microbial communities in a basalt‐hosted hot spring at Kverkfjöll volcano, Iceland |
title_full |
Biogeochemical probing of microbial communities in a basalt‐hosted hot spring at Kverkfjöll volcano, Iceland |
title_fullStr |
Biogeochemical probing of microbial communities in a basalt‐hosted hot spring at Kverkfjöll volcano, Iceland |
title_full_unstemmed |
Biogeochemical probing of microbial communities in a basalt‐hosted hot spring at Kverkfjöll volcano, Iceland |
title_sort |
biogeochemical probing of microbial communities in a basalt‐hosted hot spring at kverkfjöll volcano, iceland |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1111/gbi.12291 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgbi.12291 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gbi.12291 |
genre |
glacier Iceland Vatnajökull |
genre_facet |
glacier Iceland Vatnajökull |
op_source |
Geobiology volume 16, issue 5, page 507-521 ISSN 1472-4677 1472-4669 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/gbi.12291 |
container_title |
Geobiology |
container_volume |
16 |
container_issue |
5 |
container_start_page |
507 |
op_container_end_page |
521 |
_version_ |
1810445192646361088 |