Mesophilic mineral-weathering bacteria inhabit the critical-zone of a perennially cold basaltic environment
The weathering of silicate in the world’s critical-zone (rock-soil interface) is a natural mechanism providing a feedback on atmospheric CO2 concentrations through the carbonate-silicate cycle. We examined culturable bacterial communities from a critical-zone in western Iceland to determine the opti...
Published in: | Geomicrobiology Journal |
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Online Access: | https://oro.open.ac.uk/43257/ https://oro.open.ac.uk/43257/1/Summers%20et%20al%202015.pdf https://doi.org/10.1080/01490451.2015.1039672 |
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ftopenunivgb:oai:oro.open.ac.uk:43257 2023-06-11T04:13:10+02:00 Mesophilic mineral-weathering bacteria inhabit the critical-zone of a perennially cold basaltic environment Summers, Stephen Thomson, Bruce C. Whiteley, Andrew Cockell, Charles S. 2016 application/pdf https://oro.open.ac.uk/43257/ https://oro.open.ac.uk/43257/1/Summers%20et%20al%202015.pdf https://doi.org/10.1080/01490451.2015.1039672 unknown https://oro.open.ac.uk/43257/1/Summers%20et%20al%202015.pdf Summers, Stephen <http://oro.open.ac.uk/view/person/ss29877.html>; Thomson, Bruce C.; Whiteley, Andrew and Cockell, Charles S. (2016). Mesophilic mineral-weathering bacteria inhabit the critical-zone of a perennially cold basaltic environment. Geomicrobiology Journal, 33(1) pp. 52–62. Journal Item Public PeerReviewed 2016 ftopenunivgb https://doi.org/10.1080/01490451.2015.1039672 2023-05-28T05:52:40Z The weathering of silicate in the world’s critical-zone (rock-soil interface) is a natural mechanism providing a feedback on atmospheric CO2 concentrations through the carbonate-silicate cycle. We examined culturable bacterial communities from a critical-zone in western Iceland to determine the optimum growth temperature, ability to solubilise phosphate-containing minerals, which are abundant within the critical-zone area examined here. The majority of isolated bacteria were able to solubilize mineral-state phosphate. Almost all bacterial isolates were mesophilic (growth optima of 20-45°C), despite critical-zone temperatures that were continuously below 15°C, although all isolates could grow at temperatures associated with the critical-zone (-2.8 – 13.1°C). Only three isolates were shown to have thermal optima for growth that were within temperatures experienced at the critical-zone. These findings show that the bacteria that inhabit the western Icelandic critical-zone have temperature growth optima suboptimally adapted to their environment, implying that other adaptations may be more important for their long-term persistence in this environment. Moreover, our study showed that the cold basaltic critical-zone is a region of active phosphate mineral-weathering. Article in Journal/Newspaper Iceland The Open University: Open Research Online (ORO) Geomicrobiology Journal 33 1 52 62 |
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Open Polar |
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The Open University: Open Research Online (ORO) |
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ftopenunivgb |
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The weathering of silicate in the world’s critical-zone (rock-soil interface) is a natural mechanism providing a feedback on atmospheric CO2 concentrations through the carbonate-silicate cycle. We examined culturable bacterial communities from a critical-zone in western Iceland to determine the optimum growth temperature, ability to solubilise phosphate-containing minerals, which are abundant within the critical-zone area examined here. The majority of isolated bacteria were able to solubilize mineral-state phosphate. Almost all bacterial isolates were mesophilic (growth optima of 20-45°C), despite critical-zone temperatures that were continuously below 15°C, although all isolates could grow at temperatures associated with the critical-zone (-2.8 – 13.1°C). Only three isolates were shown to have thermal optima for growth that were within temperatures experienced at the critical-zone. These findings show that the bacteria that inhabit the western Icelandic critical-zone have temperature growth optima suboptimally adapted to their environment, implying that other adaptations may be more important for their long-term persistence in this environment. Moreover, our study showed that the cold basaltic critical-zone is a region of active phosphate mineral-weathering. |
format |
Article in Journal/Newspaper |
author |
Summers, Stephen Thomson, Bruce C. Whiteley, Andrew Cockell, Charles S. |
spellingShingle |
Summers, Stephen Thomson, Bruce C. Whiteley, Andrew Cockell, Charles S. Mesophilic mineral-weathering bacteria inhabit the critical-zone of a perennially cold basaltic environment |
author_facet |
Summers, Stephen Thomson, Bruce C. Whiteley, Andrew Cockell, Charles S. |
author_sort |
Summers, Stephen |
title |
Mesophilic mineral-weathering bacteria inhabit the critical-zone of a perennially cold basaltic environment |
title_short |
Mesophilic mineral-weathering bacteria inhabit the critical-zone of a perennially cold basaltic environment |
title_full |
Mesophilic mineral-weathering bacteria inhabit the critical-zone of a perennially cold basaltic environment |
title_fullStr |
Mesophilic mineral-weathering bacteria inhabit the critical-zone of a perennially cold basaltic environment |
title_full_unstemmed |
Mesophilic mineral-weathering bacteria inhabit the critical-zone of a perennially cold basaltic environment |
title_sort |
mesophilic mineral-weathering bacteria inhabit the critical-zone of a perennially cold basaltic environment |
publishDate |
2016 |
url |
https://oro.open.ac.uk/43257/ https://oro.open.ac.uk/43257/1/Summers%20et%20al%202015.pdf https://doi.org/10.1080/01490451.2015.1039672 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
https://oro.open.ac.uk/43257/1/Summers%20et%20al%202015.pdf Summers, Stephen <http://oro.open.ac.uk/view/person/ss29877.html>; Thomson, Bruce C.; Whiteley, Andrew and Cockell, Charles S. (2016). Mesophilic mineral-weathering bacteria inhabit the critical-zone of a perennially cold basaltic environment. Geomicrobiology Journal, 33(1) pp. 52–62. |
op_doi |
https://doi.org/10.1080/01490451.2015.1039672 |
container_title |
Geomicrobiology Journal |
container_volume |
33 |
container_issue |
1 |
container_start_page |
52 |
op_container_end_page |
62 |
_version_ |
1768389870757085184 |