Microbial growth under humic-free conditions in a supraglacial stream system on the Cotton Glacier, Antarctica
International audience During the austral summers of 2004 and 2009, we sampled a supraglacial stream on the Cotton Glacier, Antarctica. The stream dissolved organic matter (DOM) was low (44-48 mu M C) and lacked detectable humic fluorescence signatures. Analysis of the excitation emissions matrices...
Published in: | Environmental Research Letters |
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ftinraparis:oai:HAL:hal-02645819v1 2024-09-30T14:24:59+00:00 Microbial growth under humic-free conditions in a supraglacial stream system on the Cotton Glacier, Antarctica Foreman, Christine M. Cory, Rose M. Morris, Cindy E. Sanclements, Michael D Smith, Heidi J. Lisle, John T. Miller, Penney L. Chin, Yu-Ping Mcknight, Diane M. Montana State University (MSU) Earth & Environmental Sciences Unité de Pathologie Végétale (PV) Institut National de la Recherche Agronomique (INRA) University of Colorado Boulder St Petersburg Coastal Marine Science Center Partenaires INRAE Rose-Hulman Institute of Technology The Ohio State University Columbus (OSU) NSF: OPP-0338260, OPP-0338299, OPP-0338121, OPP-0338342; Montana Space Grant Consortium 2013 https://hal.inrae.fr/hal-02645819 https://hal.inrae.fr/hal-02645819/document https://hal.inrae.fr/hal-02645819/file/Christine%20M%20Foreman%20et%20al%202013_1.pdf https://doi.org/10.1088/1748-9326/8/3/035022 en eng HAL CCSD IOP Publishing info:eu-repo/semantics/altIdentifier/doi/10.1088/1748-9326/8/3/035022 hal-02645819 https://hal.inrae.fr/hal-02645819 https://hal.inrae.fr/hal-02645819/document https://hal.inrae.fr/hal-02645819/file/Christine%20M%20Foreman%20et%20al%202013_1.pdf doi:10.1088/1748-9326/8/3/035022 PRODINRA: 216417 WOS: 000325247100067 info:eu-repo/semantics/OpenAccess ISSN: 1748-9326 Environmental Research Letters https://hal.inrae.fr/hal-02645819 Environmental Research Letters, 2013, 8 (3), ⟨10.1088/1748-9326/8/3/035022⟩ dissolved organic matter (DOM) extracellular emission matrices (EEMs) ice nucleation activity fluorescence [SDE.MCG]Environmental Sciences/Global Changes [SDE.BE]Environmental Sciences/Biodiversity and Ecology info:eu-repo/semantics/article Journal articles 2013 ftinraparis https://doi.org/10.1088/1748-9326/8/3/035022 2024-09-10T14:44:14Z International audience During the austral summers of 2004 and 2009, we sampled a supraglacial stream on the Cotton Glacier, Antarctica. The stream dissolved organic matter (DOM) was low (44-48 mu M C) and lacked detectable humic fluorescence signatures. Analysis of the excitation emissions matrices (EEMs) indicated that amino-acid fluorophores dominated, consistent with DOM of microbial origin, with little humic-like fluorescence. In most aquatic ecosystems, humic DOM attenuates harmful UV radiation and its absence may represent an additional stressor influencing the microbial community. Nonetheless, the stream contained an active microbial assemblage with bacterial cell abundances from 2.94 x 10(4) to 4.97 x 10(5) cells ml(-1), and bacterial production ranging from 58.8 to 293.2 ng C l(-1) d(-1). Chlorophyll-a concentrations ranged from 0.3 to 0.53 mu g l(-1) indicating that algal phototrophs were the probable source of the DOM. Microbial isolates produced a rainbow of pigment colors, suggesting adaptation to stress, and were similar to those from other cryogenic systems (Proteobacteria and Bacteroidetes lineages). Supraglacial streams provide an example of contemporary microbial processes on the glacier surface and a natural laboratory for studying microbial adaptation to the absence of humics. Article in Journal/Newspaper Antarc* Antarctica Institut National de la Recherche Agronomique: ProdINRA Austral Cotton Glacier ENVELOPE(161.667,161.667,-77.117,-77.117) Environmental Research Letters 8 3 035022 |
institution |
Open Polar |
collection |
Institut National de la Recherche Agronomique: ProdINRA |
op_collection_id |
ftinraparis |
language |
English |
topic |
dissolved organic matter (DOM) extracellular emission matrices (EEMs) ice nucleation activity fluorescence [SDE.MCG]Environmental Sciences/Global Changes [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
spellingShingle |
dissolved organic matter (DOM) extracellular emission matrices (EEMs) ice nucleation activity fluorescence [SDE.MCG]Environmental Sciences/Global Changes [SDE.BE]Environmental Sciences/Biodiversity and Ecology Foreman, Christine M. Cory, Rose M. Morris, Cindy E. Sanclements, Michael D Smith, Heidi J. Lisle, John T. Miller, Penney L. Chin, Yu-Ping Mcknight, Diane M. Microbial growth under humic-free conditions in a supraglacial stream system on the Cotton Glacier, Antarctica |
topic_facet |
dissolved organic matter (DOM) extracellular emission matrices (EEMs) ice nucleation activity fluorescence [SDE.MCG]Environmental Sciences/Global Changes [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
description |
International audience During the austral summers of 2004 and 2009, we sampled a supraglacial stream on the Cotton Glacier, Antarctica. The stream dissolved organic matter (DOM) was low (44-48 mu M C) and lacked detectable humic fluorescence signatures. Analysis of the excitation emissions matrices (EEMs) indicated that amino-acid fluorophores dominated, consistent with DOM of microbial origin, with little humic-like fluorescence. In most aquatic ecosystems, humic DOM attenuates harmful UV radiation and its absence may represent an additional stressor influencing the microbial community. Nonetheless, the stream contained an active microbial assemblage with bacterial cell abundances from 2.94 x 10(4) to 4.97 x 10(5) cells ml(-1), and bacterial production ranging from 58.8 to 293.2 ng C l(-1) d(-1). Chlorophyll-a concentrations ranged from 0.3 to 0.53 mu g l(-1) indicating that algal phototrophs were the probable source of the DOM. Microbial isolates produced a rainbow of pigment colors, suggesting adaptation to stress, and were similar to those from other cryogenic systems (Proteobacteria and Bacteroidetes lineages). Supraglacial streams provide an example of contemporary microbial processes on the glacier surface and a natural laboratory for studying microbial adaptation to the absence of humics. |
author2 |
Montana State University (MSU) Earth & Environmental Sciences Unité de Pathologie Végétale (PV) Institut National de la Recherche Agronomique (INRA) University of Colorado Boulder St Petersburg Coastal Marine Science Center Partenaires INRAE Rose-Hulman Institute of Technology The Ohio State University Columbus (OSU) NSF: OPP-0338260, OPP-0338299, OPP-0338121, OPP-0338342; Montana Space Grant Consortium |
format |
Article in Journal/Newspaper |
author |
Foreman, Christine M. Cory, Rose M. Morris, Cindy E. Sanclements, Michael D Smith, Heidi J. Lisle, John T. Miller, Penney L. Chin, Yu-Ping Mcknight, Diane M. |
author_facet |
Foreman, Christine M. Cory, Rose M. Morris, Cindy E. Sanclements, Michael D Smith, Heidi J. Lisle, John T. Miller, Penney L. Chin, Yu-Ping Mcknight, Diane M. |
author_sort |
Foreman, Christine M. |
title |
Microbial growth under humic-free conditions in a supraglacial stream system on the Cotton Glacier, Antarctica |
title_short |
Microbial growth under humic-free conditions in a supraglacial stream system on the Cotton Glacier, Antarctica |
title_full |
Microbial growth under humic-free conditions in a supraglacial stream system on the Cotton Glacier, Antarctica |
title_fullStr |
Microbial growth under humic-free conditions in a supraglacial stream system on the Cotton Glacier, Antarctica |
title_full_unstemmed |
Microbial growth under humic-free conditions in a supraglacial stream system on the Cotton Glacier, Antarctica |
title_sort |
microbial growth under humic-free conditions in a supraglacial stream system on the cotton glacier, antarctica |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.inrae.fr/hal-02645819 https://hal.inrae.fr/hal-02645819/document https://hal.inrae.fr/hal-02645819/file/Christine%20M%20Foreman%20et%20al%202013_1.pdf https://doi.org/10.1088/1748-9326/8/3/035022 |
long_lat |
ENVELOPE(161.667,161.667,-77.117,-77.117) |
geographic |
Austral Cotton Glacier |
geographic_facet |
Austral Cotton Glacier |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ISSN: 1748-9326 Environmental Research Letters https://hal.inrae.fr/hal-02645819 Environmental Research Letters, 2013, 8 (3), ⟨10.1088/1748-9326/8/3/035022⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1088/1748-9326/8/3/035022 hal-02645819 https://hal.inrae.fr/hal-02645819 https://hal.inrae.fr/hal-02645819/document https://hal.inrae.fr/hal-02645819/file/Christine%20M%20Foreman%20et%20al%202013_1.pdf doi:10.1088/1748-9326/8/3/035022 PRODINRA: 216417 WOS: 000325247100067 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1088/1748-9326/8/3/035022 |
container_title |
Environmental Research Letters |
container_volume |
8 |
container_issue |
3 |
container_start_page |
035022 |
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1811643015890993152 |