Extremotrophs, extremophiles and broadband pigmentation strategies in a high arctic ice shelf ecosystem.
Remnant ice shelves along the northern coast of Ellesmere Island, Nunavut, Canada (83°N) provide a habitat for cryo-tolerant microbial mat communities. Bioassays of bacterial and primary production were undertaken to quantify the short-term physiological response of the mats to changes in key varia...
Published in: | FEMS Microbiology Ecology |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2005
|
Subjects: | |
Online Access: | https://curve.carleton.ca/2650c911-7a53-4ef1-917a-6e5e4b522ea8 https://doi.org/10.1016/j.femsec.2004.11.001 http://femsec.oxfordjournals.org/content/53/1/73 |
id |
ftcarletonuniv:oai:curve.carleton.ca:25013 |
---|---|
record_format |
openpolar |
spelling |
ftcarletonuniv:oai:curve.carleton.ca:25013 2023-05-15T15:04:12+02:00 Extremotrophs, extremophiles and broadband pigmentation strategies in a high arctic ice shelf ecosystem. Mueller, D.R. Vincent, W.F. Bonilla, S. Laurion, I. 2005-06-01 https://curve.carleton.ca/2650c911-7a53-4ef1-917a-6e5e4b522ea8 https://doi.org/10.1016/j.femsec.2004.11.001 http://femsec.oxfordjournals.org/content/53/1/73 unknown https://curve.carleton.ca/2650c911-7a53-4ef1-917a-6e5e4b522ea8 http://dx.doi.org/10.1016/j.femsec.2004.11.001 http://femsec.oxfordjournals.org/content/53/1/73 Journal Article 2005 ftcarletonuniv https://doi.org/10.1016/j.femsec.2004.11.001 2022-01-23T08:18:37Z Remnant ice shelves along the northern coast of Ellesmere Island, Nunavut, Canada (83°N) provide a habitat for cryo-tolerant microbial mat communities. Bioassays of bacterial and primary production were undertaken to quantify the short-term physiological response of the mats to changes in key variables that characterize this cryo-ecosystem (salinity, irradiance and temperature). The heterotrophic versus autotrophic community responses to these stressors differed markedly. The heterotrophic bacteria were extremophilic and specifically adapted to ambient conditions on the ice shelf, whereas the autotrophic community had broader tolerance ranges and optima outside the ambient range. This latter, extremotrophic response may be partly due to a diverse suite of pigments including oligosaccharide mycosporine-like amino acids, scytonemins, carotenoids, phycobiliproteins and chlorophylls that absorb from the near UV-B to red wavelengths. These pigments provide a comprehensive broadband strategy for coping with the multiple stressors of high irradiance, variable salinity and low temperatures in this extreme cryo-environment. Keywords Ice shelf Microbial mats Scytonemin Oligosaccharide mycosporine-like amino acid Productivity Extremophile Extremotroph Article in Journal/Newspaper Arctic Ellesmere Island Ice Shelf Ice Shelves Nunavut CURVE - Carleton University Research Virtual Environment Arctic Nunavut Ellesmere Island Canada FEMS Microbiology Ecology 53 1 73 87 |
institution |
Open Polar |
collection |
CURVE - Carleton University Research Virtual Environment |
op_collection_id |
ftcarletonuniv |
language |
unknown |
description |
Remnant ice shelves along the northern coast of Ellesmere Island, Nunavut, Canada (83°N) provide a habitat for cryo-tolerant microbial mat communities. Bioassays of bacterial and primary production were undertaken to quantify the short-term physiological response of the mats to changes in key variables that characterize this cryo-ecosystem (salinity, irradiance and temperature). The heterotrophic versus autotrophic community responses to these stressors differed markedly. The heterotrophic bacteria were extremophilic and specifically adapted to ambient conditions on the ice shelf, whereas the autotrophic community had broader tolerance ranges and optima outside the ambient range. This latter, extremotrophic response may be partly due to a diverse suite of pigments including oligosaccharide mycosporine-like amino acids, scytonemins, carotenoids, phycobiliproteins and chlorophylls that absorb from the near UV-B to red wavelengths. These pigments provide a comprehensive broadband strategy for coping with the multiple stressors of high irradiance, variable salinity and low temperatures in this extreme cryo-environment. Keywords Ice shelf Microbial mats Scytonemin Oligosaccharide mycosporine-like amino acid Productivity Extremophile Extremotroph |
format |
Article in Journal/Newspaper |
author |
Mueller, D.R. Vincent, W.F. Bonilla, S. Laurion, I. |
spellingShingle |
Mueller, D.R. Vincent, W.F. Bonilla, S. Laurion, I. Extremotrophs, extremophiles and broadband pigmentation strategies in a high arctic ice shelf ecosystem. |
author_facet |
Mueller, D.R. Vincent, W.F. Bonilla, S. Laurion, I. |
author_sort |
Mueller, D.R. |
title |
Extremotrophs, extremophiles and broadband pigmentation strategies in a high arctic ice shelf ecosystem. |
title_short |
Extremotrophs, extremophiles and broadband pigmentation strategies in a high arctic ice shelf ecosystem. |
title_full |
Extremotrophs, extremophiles and broadband pigmentation strategies in a high arctic ice shelf ecosystem. |
title_fullStr |
Extremotrophs, extremophiles and broadband pigmentation strategies in a high arctic ice shelf ecosystem. |
title_full_unstemmed |
Extremotrophs, extremophiles and broadband pigmentation strategies in a high arctic ice shelf ecosystem. |
title_sort |
extremotrophs, extremophiles and broadband pigmentation strategies in a high arctic ice shelf ecosystem. |
publishDate |
2005 |
url |
https://curve.carleton.ca/2650c911-7a53-4ef1-917a-6e5e4b522ea8 https://doi.org/10.1016/j.femsec.2004.11.001 http://femsec.oxfordjournals.org/content/53/1/73 |
geographic |
Arctic Nunavut Ellesmere Island Canada |
geographic_facet |
Arctic Nunavut Ellesmere Island Canada |
genre |
Arctic Ellesmere Island Ice Shelf Ice Shelves Nunavut |
genre_facet |
Arctic Ellesmere Island Ice Shelf Ice Shelves Nunavut |
op_relation |
https://curve.carleton.ca/2650c911-7a53-4ef1-917a-6e5e4b522ea8 http://dx.doi.org/10.1016/j.femsec.2004.11.001 http://femsec.oxfordjournals.org/content/53/1/73 |
op_doi |
https://doi.org/10.1016/j.femsec.2004.11.001 |
container_title |
FEMS Microbiology Ecology |
container_volume |
53 |
container_issue |
1 |
container_start_page |
73 |
op_container_end_page |
87 |
_version_ |
1766336006932398080 |