Aquatic Microbial Ecology 26:115
ABSTRACT: Artificial microbial mats were cultured at 4 to 7°C in benthic gradient chambers using inocula of Antarctic lake mats (Lake Fryxell, Dry Valleys). Their formation and structure were studied based on both HPLC pigment quantification and microsensor measurements of oxygen profiles. Accretion...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1040.1783 2023-05-15T14:04:12+02:00 Aquatic Microbial Ecology 26:115 Evelyne Buffan-Dubau Olivier Pringault Rutger De Wit Inter - Research The Pennsylvania State University CiteSeerX Archives 2001 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1040.1783 http://www.ird.nc/CAMELIA/Pringault/Buffan-Dubau_et_al_2001.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1040.1783 http://www.ird.nc/CAMELIA/Pringault/Buffan-Dubau_et_al_2001.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.ird.nc/CAMELIA/Pringault/Buffan-Dubau_et_al_2001.pdf text 2001 ftciteseerx 2020-03-08T01:23:05Z ABSTRACT: Artificial microbial mats were cultured at 4 to 7°C in benthic gradient chambers using inocula of Antarctic lake mats (Lake Fryxell, Dry Valleys). Their formation and structure were studied based on both HPLC pigment quantification and microsensor measurements of oxygen profiles. Accretion rates (2 to 5 mm within the year) were consistent with previous estimations for artificial mats cultured at 17 to 25°C, suggesting that the microbial community was cold-adapted. Mats were vertically structured comprising an upper green layer dominated by cyanobacteria and an underlying pink layer including purple non-sulphur phototrophic bacteria. Pigment contents indicated that both groups of cyanobacteria (Oscillatoriacae and possibly Nostoc sp.) adopted different patterns of vertical distributions within the mats. Heterogeneity of oxygen vertical distributions was determined, and net primary productivity rates were in the range of those previously reported for natural Antarctic microbial mats. Collective considerations of pigment contents and primary productivity strongly suggest that artificial mats presented some characteristics of natural polar mats, although some differences were established. KEY WORDS: Antarctica · Artificial mats · Psychroptrophs · Pigments · HPLC · Net productivity Resale or republication not permitted without written consent of the publisher Aquat Microb Ecol 26: 115-125, 2001 from Antarctic meltwater ponds have been characterised; however, little is known about cold-adaptation processes in Antarctic mats MATERIALS AND METHODS Site and sampling. Lake Fryxell (75°36' S, 163°35' E) is located in the Taylor Valley of the Dry Valley region, western Antarctica. The Dry Valleys are surrounded by 2500 to 3000 m high mountains (Transantarctic mountain range) and this results in an annual snowfall of only 2 to 4 cm Mat cultures in BGC. BGC previously allowed culturing of microbial biofilms of phototrophic bacteria under conditions mimicking light, oxygen, sulfide, and pH gradients occurring in ... Text Antarc* Antarctic Antarctica Unknown Antarctic Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) Lake Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) |
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Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
ABSTRACT: Artificial microbial mats were cultured at 4 to 7°C in benthic gradient chambers using inocula of Antarctic lake mats (Lake Fryxell, Dry Valleys). Their formation and structure were studied based on both HPLC pigment quantification and microsensor measurements of oxygen profiles. Accretion rates (2 to 5 mm within the year) were consistent with previous estimations for artificial mats cultured at 17 to 25°C, suggesting that the microbial community was cold-adapted. Mats were vertically structured comprising an upper green layer dominated by cyanobacteria and an underlying pink layer including purple non-sulphur phototrophic bacteria. Pigment contents indicated that both groups of cyanobacteria (Oscillatoriacae and possibly Nostoc sp.) adopted different patterns of vertical distributions within the mats. Heterogeneity of oxygen vertical distributions was determined, and net primary productivity rates were in the range of those previously reported for natural Antarctic microbial mats. Collective considerations of pigment contents and primary productivity strongly suggest that artificial mats presented some characteristics of natural polar mats, although some differences were established. KEY WORDS: Antarctica · Artificial mats · Psychroptrophs · Pigments · HPLC · Net productivity Resale or republication not permitted without written consent of the publisher Aquat Microb Ecol 26: 115-125, 2001 from Antarctic meltwater ponds have been characterised; however, little is known about cold-adaptation processes in Antarctic mats MATERIALS AND METHODS Site and sampling. Lake Fryxell (75°36' S, 163°35' E) is located in the Taylor Valley of the Dry Valley region, western Antarctica. The Dry Valleys are surrounded by 2500 to 3000 m high mountains (Transantarctic mountain range) and this results in an annual snowfall of only 2 to 4 cm Mat cultures in BGC. BGC previously allowed culturing of microbial biofilms of phototrophic bacteria under conditions mimicking light, oxygen, sulfide, and pH gradients occurring in ... |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Evelyne Buffan-Dubau Olivier Pringault Rutger De Wit Inter - Research |
spellingShingle |
Evelyne Buffan-Dubau Olivier Pringault Rutger De Wit Inter - Research Aquatic Microbial Ecology 26:115 |
author_facet |
Evelyne Buffan-Dubau Olivier Pringault Rutger De Wit Inter - Research |
author_sort |
Evelyne Buffan-Dubau |
title |
Aquatic Microbial Ecology 26:115 |
title_short |
Aquatic Microbial Ecology 26:115 |
title_full |
Aquatic Microbial Ecology 26:115 |
title_fullStr |
Aquatic Microbial Ecology 26:115 |
title_full_unstemmed |
Aquatic Microbial Ecology 26:115 |
title_sort |
aquatic microbial ecology 26:115 |
publishDate |
2001 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1040.1783 http://www.ird.nc/CAMELIA/Pringault/Buffan-Dubau_et_al_2001.pdf |
long_lat |
ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(163.000,163.000,-77.617,-77.617) |
geographic |
Antarctic Fryxell Lake Fryxell Taylor Valley |
geographic_facet |
Antarctic Fryxell Lake Fryxell Taylor Valley |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
http://www.ird.nc/CAMELIA/Pringault/Buffan-Dubau_et_al_2001.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1040.1783 http://www.ird.nc/CAMELIA/Pringault/Buffan-Dubau_et_al_2001.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766275221617115136 |