Microstructural Characterization of Cyanobacterial Mats from the McMurdo Ice Shelf, Antarctica
ABSTRACT The three-dimensional structures of two types of cyanobacterium-dominated microbial mats from meltwater ponds on the McMurdo Ice Shelf were as determined by using a broad suite of complementary techniques, including optical and fluorescence microscopy, confocal scanning laser microscopy, sc...
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Online Access: | http://dx.doi.org/10.1128/aem.70.1.569-580.2004 https://journals.asm.org/doi/pdf/10.1128/AEM.70.1.569-580.2004 |
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crasmicro:10.1128/aem.70.1.569-580.2004 2024-06-23T07:47:26+00:00 Microstructural Characterization of Cyanobacterial Mats from the McMurdo Ice Shelf, Antarctica de los Ríos, Asunción Ascaso, Carmen Wierzchos, Jacek Fernández-Valiente, Eduardo Quesada, Antonio 2004 http://dx.doi.org/10.1128/aem.70.1.569-580.2004 https://journals.asm.org/doi/pdf/10.1128/AEM.70.1.569-580.2004 en eng American Society for Microbiology https://journals.asm.org/non-commercial-tdm-license Applied and Environmental Microbiology volume 70, issue 1, page 569-580 ISSN 0099-2240 1098-5336 journal-article 2004 crasmicro https://doi.org/10.1128/aem.70.1.569-580.2004 2024-06-10T04:07:21Z ABSTRACT The three-dimensional structures of two types of cyanobacterium-dominated microbial mats from meltwater ponds on the McMurdo Ice Shelf were as determined by using a broad suite of complementary techniques, including optical and fluorescence microscopy, confocal scanning laser microscopy, scanning electron microscopy with back-scattered electron-imaging mode, low-temperature scanning electron microscopy, and microanalyitical X-ray energy dispersive spectroscopy. By using a combination of the different in situ microscopic techniques, the Antarctic microbial mats were found to be structures with vertical stratification of groups of cyanobacteria and mineral sediments, high contents of extracellular polymeric substances, and large void spaces occupied by water. In cyanobacterium-rich layers, heterocystous nostocalean and nonheterocystous oscillatorialean taxa were the most abundant taxa and appeared to be intermixed with fine-size deposits of epicellular silica and calcium carbonate. Most of the cyanobacterial filaments had similar orientations in zones without sediment particles, but thin filaments were tangled among thicker filaments. The combination of the microscopic techniques used showed the relative positions of biological and mineral entities within the microbial mats and enabled some speculation about their interactions. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Shelf McMurdo Ice Shelf ASM Journals (American Society for Microbiology) Antarctic McMurdo Ice Shelf ENVELOPE(166.500,166.500,-78.000,-78.000) The Antarctic Applied and Environmental Microbiology 70 1 569 580 |
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Open Polar |
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ASM Journals (American Society for Microbiology) |
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crasmicro |
language |
English |
description |
ABSTRACT The three-dimensional structures of two types of cyanobacterium-dominated microbial mats from meltwater ponds on the McMurdo Ice Shelf were as determined by using a broad suite of complementary techniques, including optical and fluorescence microscopy, confocal scanning laser microscopy, scanning electron microscopy with back-scattered electron-imaging mode, low-temperature scanning electron microscopy, and microanalyitical X-ray energy dispersive spectroscopy. By using a combination of the different in situ microscopic techniques, the Antarctic microbial mats were found to be structures with vertical stratification of groups of cyanobacteria and mineral sediments, high contents of extracellular polymeric substances, and large void spaces occupied by water. In cyanobacterium-rich layers, heterocystous nostocalean and nonheterocystous oscillatorialean taxa were the most abundant taxa and appeared to be intermixed with fine-size deposits of epicellular silica and calcium carbonate. Most of the cyanobacterial filaments had similar orientations in zones without sediment particles, but thin filaments were tangled among thicker filaments. The combination of the microscopic techniques used showed the relative positions of biological and mineral entities within the microbial mats and enabled some speculation about their interactions. |
format |
Article in Journal/Newspaper |
author |
de los Ríos, Asunción Ascaso, Carmen Wierzchos, Jacek Fernández-Valiente, Eduardo Quesada, Antonio |
spellingShingle |
de los Ríos, Asunción Ascaso, Carmen Wierzchos, Jacek Fernández-Valiente, Eduardo Quesada, Antonio Microstructural Characterization of Cyanobacterial Mats from the McMurdo Ice Shelf, Antarctica |
author_facet |
de los Ríos, Asunción Ascaso, Carmen Wierzchos, Jacek Fernández-Valiente, Eduardo Quesada, Antonio |
author_sort |
de los Ríos, Asunción |
title |
Microstructural Characterization of Cyanobacterial Mats from the McMurdo Ice Shelf, Antarctica |
title_short |
Microstructural Characterization of Cyanobacterial Mats from the McMurdo Ice Shelf, Antarctica |
title_full |
Microstructural Characterization of Cyanobacterial Mats from the McMurdo Ice Shelf, Antarctica |
title_fullStr |
Microstructural Characterization of Cyanobacterial Mats from the McMurdo Ice Shelf, Antarctica |
title_full_unstemmed |
Microstructural Characterization of Cyanobacterial Mats from the McMurdo Ice Shelf, Antarctica |
title_sort |
microstructural characterization of cyanobacterial mats from the mcmurdo ice shelf, antarctica |
publisher |
American Society for Microbiology |
publishDate |
2004 |
url |
http://dx.doi.org/10.1128/aem.70.1.569-580.2004 https://journals.asm.org/doi/pdf/10.1128/AEM.70.1.569-580.2004 |
long_lat |
ENVELOPE(166.500,166.500,-78.000,-78.000) |
geographic |
Antarctic McMurdo Ice Shelf The Antarctic |
geographic_facet |
Antarctic McMurdo Ice Shelf The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Shelf McMurdo Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf McMurdo Ice Shelf |
op_source |
Applied and Environmental Microbiology volume 70, issue 1, page 569-580 ISSN 0099-2240 1098-5336 |
op_rights |
https://journals.asm.org/non-commercial-tdm-license |
op_doi |
https://doi.org/10.1128/aem.70.1.569-580.2004 |
container_title |
Applied and Environmental Microbiology |
container_volume |
70 |
container_issue |
1 |
container_start_page |
569 |
op_container_end_page |
580 |
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1802651538294833152 |