The fine structure of an algal mat from a freshwater maritime antarctic lake
The three-dimensional microstructure of Tolypothrix mats from the bottom of a maritime antarctic lake of Signy Island, South Orkneys, was examined. Samples from mats at two depths, 4 and 6 m, within the lake were taken by scuba divers and frozen (−80 °C) in March 1987. The samples were freeze-fractu...
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1990
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ftnerc:oai:nora.nerc.ac.uk:520724 2023-05-15T13:49:35+02:00 The fine structure of an algal mat from a freshwater maritime antarctic lake Oppenheim, Deborah R. Paterson, David M. 1990 http://nora.nerc.ac.uk/id/eprint/520724/ https://doi.org/10.1139/b90-024 unknown Canadian Science Publishing Oppenheim, Deborah R.; Paterson, David M. 1990 The fine structure of an algal mat from a freshwater maritime antarctic lake. Canadian Journal of Botany, 68 (1). 174-183. https://doi.org/10.1139/b90-024 <https://doi.org/10.1139/b90-024> Botany Publication - Article PeerReviewed 1990 ftnerc https://doi.org/10.1139/b90-024 2023-02-04T19:46:55Z The three-dimensional microstructure of Tolypothrix mats from the bottom of a maritime antarctic lake of Signy Island, South Orkneys, was examined. Samples from mats at two depths, 4 and 6 m, within the lake were taken by scuba divers and frozen (−80 °C) in March 1987. The samples were freeze-fractured and examined by ambient and low temperature scanning electron microscopy (LTSEM). The mats shared a similar structure consisting of a compact lower zone of prostrate filaments and an upper zone of loose vertical filaments. An outer layer of extremely loose spreading filaments was only found by LTSEM, leading to the conclusion that some collapse of the mat structure occurred during dehydration for ambient SEM. Fine detail of the mat matrix such as the attachment of epiphytes and associated microfauna to the filaments was often obscured by mucilage. Fast-particle etching was used to remove this mucilage and also the organic coat that covers uncleaned diatoms, thereby allowing the identification of attached cells in situ. A variety of attachment strategies were observed although sessile forms were most common. Further fast-particle etching of the epiphytic diatom assemblages revealed that many of the attached diatoms were devoid of cell contents. Together with the epiphytic diatoms a variety of microfauna were identified, both incorporated within the mat and on the mat surface. The implications of these observations are discussed. Article in Journal/Newspaper Antarc* Antarctic Signy Island Natural Environment Research Council: NERC Open Research Archive Antarctic Signy Island ENVELOPE(-45.595,-45.595,-60.708,-60.708) Canadian Journal of Botany 68 1 174 183 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Botany |
spellingShingle |
Botany Oppenheim, Deborah R. Paterson, David M. The fine structure of an algal mat from a freshwater maritime antarctic lake |
topic_facet |
Botany |
description |
The three-dimensional microstructure of Tolypothrix mats from the bottom of a maritime antarctic lake of Signy Island, South Orkneys, was examined. Samples from mats at two depths, 4 and 6 m, within the lake were taken by scuba divers and frozen (−80 °C) in March 1987. The samples were freeze-fractured and examined by ambient and low temperature scanning electron microscopy (LTSEM). The mats shared a similar structure consisting of a compact lower zone of prostrate filaments and an upper zone of loose vertical filaments. An outer layer of extremely loose spreading filaments was only found by LTSEM, leading to the conclusion that some collapse of the mat structure occurred during dehydration for ambient SEM. Fine detail of the mat matrix such as the attachment of epiphytes and associated microfauna to the filaments was often obscured by mucilage. Fast-particle etching was used to remove this mucilage and also the organic coat that covers uncleaned diatoms, thereby allowing the identification of attached cells in situ. A variety of attachment strategies were observed although sessile forms were most common. Further fast-particle etching of the epiphytic diatom assemblages revealed that many of the attached diatoms were devoid of cell contents. Together with the epiphytic diatoms a variety of microfauna were identified, both incorporated within the mat and on the mat surface. The implications of these observations are discussed. |
format |
Article in Journal/Newspaper |
author |
Oppenheim, Deborah R. Paterson, David M. |
author_facet |
Oppenheim, Deborah R. Paterson, David M. |
author_sort |
Oppenheim, Deborah R. |
title |
The fine structure of an algal mat from a freshwater maritime antarctic lake |
title_short |
The fine structure of an algal mat from a freshwater maritime antarctic lake |
title_full |
The fine structure of an algal mat from a freshwater maritime antarctic lake |
title_fullStr |
The fine structure of an algal mat from a freshwater maritime antarctic lake |
title_full_unstemmed |
The fine structure of an algal mat from a freshwater maritime antarctic lake |
title_sort |
fine structure of an algal mat from a freshwater maritime antarctic lake |
publisher |
Canadian Science Publishing |
publishDate |
1990 |
url |
http://nora.nerc.ac.uk/id/eprint/520724/ https://doi.org/10.1139/b90-024 |
long_lat |
ENVELOPE(-45.595,-45.595,-60.708,-60.708) |
geographic |
Antarctic Signy Island |
geographic_facet |
Antarctic Signy Island |
genre |
Antarc* Antarctic Signy Island |
genre_facet |
Antarc* Antarctic Signy Island |
op_relation |
Oppenheim, Deborah R.; Paterson, David M. 1990 The fine structure of an algal mat from a freshwater maritime antarctic lake. Canadian Journal of Botany, 68 (1). 174-183. https://doi.org/10.1139/b90-024 <https://doi.org/10.1139/b90-024> |
op_doi |
https://doi.org/10.1139/b90-024 |
container_title |
Canadian Journal of Botany |
container_volume |
68 |
container_issue |
1 |
container_start_page |
174 |
op_container_end_page |
183 |
_version_ |
1766251801182470144 |