Biogeochemical probing of microbial communities in a basalt-hosted hot spring at Kverkfjöll volcano, Iceland
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 environme...
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Online Access: | https://eprints.bbk.ac.uk/id/eprint/22705/ https://eprints.bbk.ac.uk/id/eprint/22705/1/22705.pdf https://doi.org/10.1111/gbi.12291 |
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ftbirkbeckcoll:oai:eprints.bbk.ac.uk.oai2:22705 2023-05-15T16:21:45+02:00 Biogeochemical probing of microbial communities in a basalt-hosted hot spring at Kverkfjöll volcano, Iceland Cousins, C. Fogel, M. Bowden, R. Crawford, Ian Boyce, A. Cockell, C. Gunn, M. 2018-06-01 text https://eprints.bbk.ac.uk/id/eprint/22705/ https://eprints.bbk.ac.uk/id/eprint/22705/1/22705.pdf https://doi.org/10.1111/gbi.12291 en eng Wiley https://eprints.bbk.ac.uk/id/eprint/22705/1/22705.pdf Cousins, C. and Fogel, M. and Bowden, R. and Crawford, Ian and Boyce, A. and Cockell, C. and Gunn, M. (2018) Biogeochemical probing of microbial communities in a basalt-hosted hot spring at Kverkfjöll volcano, Iceland. Geobiology 16 (5), pp. 507-521. ISSN 1472-4677. Earth and Planetary Sciences Article PeerReviewed 2018 ftbirkbeckcoll https://doi.org/10.1111/gbi.12291 2022-01-09T09:02:58Z 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 δ13Corg (‰ 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 (δ34S ~0‰) and dissolved water sulfate (δ34S +3.2‰), and δ18O 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 BIROn - Birkbeck Institutional Research Online (Birkbeck University of London) Kverkfjöll ENVELOPE(-16.700,-16.700,64.650,64.650) Vatnajökull ENVELOPE(-16.823,-16.823,64.420,64.420) Geobiology 16 5 507 521 |
institution |
Open Polar |
collection |
BIROn - Birkbeck Institutional Research Online (Birkbeck University of London) |
op_collection_id |
ftbirkbeckcoll |
language |
English |
topic |
Earth and Planetary Sciences |
spellingShingle |
Earth and Planetary Sciences Cousins, C. Fogel, M. Bowden, R. Crawford, Ian Boyce, A. Cockell, C. Gunn, M. Biogeochemical probing of microbial communities in a basalt-hosted hot spring at Kverkfjöll volcano, Iceland |
topic_facet |
Earth and Planetary Sciences |
description |
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 δ13Corg (‰ 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 (δ34S ~0‰) and dissolved water sulfate (δ34S +3.2‰), and δ18O 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. |
format |
Article in Journal/Newspaper |
author |
Cousins, C. Fogel, M. Bowden, R. Crawford, Ian Boyce, A. Cockell, C. Gunn, M. |
author_facet |
Cousins, C. Fogel, M. Bowden, R. Crawford, Ian Boyce, A. Cockell, C. Gunn, M. |
author_sort |
Cousins, C. |
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 |
https://eprints.bbk.ac.uk/id/eprint/22705/ https://eprints.bbk.ac.uk/id/eprint/22705/1/22705.pdf https://doi.org/10.1111/gbi.12291 |
long_lat |
ENVELOPE(-16.700,-16.700,64.650,64.650) ENVELOPE(-16.823,-16.823,64.420,64.420) |
geographic |
Kverkfjöll Vatnajökull |
geographic_facet |
Kverkfjöll Vatnajökull |
genre |
glacier Iceland Vatnajökull |
genre_facet |
glacier Iceland Vatnajökull |
op_relation |
https://eprints.bbk.ac.uk/id/eprint/22705/1/22705.pdf Cousins, C. and Fogel, M. and Bowden, R. and Crawford, Ian and Boyce, A. and Cockell, C. and Gunn, M. (2018) Biogeochemical probing of microbial communities in a basalt-hosted hot spring at Kverkfjöll volcano, Iceland. Geobiology 16 (5), pp. 507-521. ISSN 1472-4677. |
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_ |
1766009742253096960 |