Changes in the lipid composition of Antarctic sea-ice diatom communities during a spring bloom: an indication of community physiological status
The lipid composition of natural populations of diatoms in the sea ice at McMurdo Sound was determined during the austral spring bloom of 1985, using and Iatroscan TLC–FID system. The major lipid classes in all samples were polar lipids (including phospholipid, glycolipid and chlorophyll) and triacy...
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Cambridge University Press (CUP)
1989
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Online Access: | http://dx.doi.org/10.1017/s0954102089000209 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102089000209 |
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crcambridgeupr:10.1017/s0954102089000209 2024-03-03T08:38:19+00:00 Changes in the lipid composition of Antarctic sea-ice diatom communities during a spring bloom: an indication of community physiological status Nichols, Peter D. Palmisano, Anna C. Rayner, Mark S. Smith, Glen A. White, David C. 1989 http://dx.doi.org/10.1017/s0954102089000209 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102089000209 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 1, issue 2, page 133-140 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 1989 crcambridgeupr https://doi.org/10.1017/s0954102089000209 2024-02-08T08:37:49Z The lipid composition of natural populations of diatoms in the sea ice at McMurdo Sound was determined during the austral spring bloom of 1985, using and Iatroscan TLC–FID system. The major lipid classes in all samples were polar lipids (including phospholipid, glycolipid and chlorophyll) and triacylglycerol, with lesser proportions of free fatty acids. Total lipid increased through November and early December, reaching a maximum (3300 mg m −2 at Cape Armitage and 1800 mg m −2 at Erebus Ice Tongue) c . one week after the chlorophyll a maxima. This increase was largely attributable to a corresponding increase in triacylglycerol. At the lipid maxima, triacylglycerol/polar lipid ratios in the range 1.0 to 2.5 were observed. The dynamic variations in lipid class abundances indicate that profound changes in the physiology of sea-ice diatoms are occurring throughout the spring bloom. A range of sterols (C 26 –C 30 ) were detected; 24-methylenecholesterol, brassicasterol and 24-ethylcholesterol were the major sterols at the Cape Armitage and Erebus sites. The similarity of the sterol profiles to those of Antarctic freshwater algal communities strongly indicates diatoms as a more probable source of C 29 sterols in the freshwater lakes than cyanobacteria or other algal groups. The hydrocarbons isolated from sea-ice diatoms at all sites were dominated by two unsaturated components, n−C 21:6 and a diunsaturated isoprenoid C 25 alkene. Until this study, no biological source had been validated for the isoprenoid C 25:2 diene, even though it has been detected in many estuarine and coastal sediments. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science McMurdo Sound Sea ice Cambridge University Press Antarctic Austral McMurdo Sound Fid ENVELOPE(-65.939,-65.939,-68.664,-68.664) Armitage ENVELOPE(166.667,166.667,-77.850,-77.850) Cape Armitage ENVELOPE(163.250,163.250,-78.150,-78.150) Antarctic Science 1 2 133 140 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Nichols, Peter D. Palmisano, Anna C. Rayner, Mark S. Smith, Glen A. White, David C. Changes in the lipid composition of Antarctic sea-ice diatom communities during a spring bloom: an indication of community physiological status |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
The lipid composition of natural populations of diatoms in the sea ice at McMurdo Sound was determined during the austral spring bloom of 1985, using and Iatroscan TLC–FID system. The major lipid classes in all samples were polar lipids (including phospholipid, glycolipid and chlorophyll) and triacylglycerol, with lesser proportions of free fatty acids. Total lipid increased through November and early December, reaching a maximum (3300 mg m −2 at Cape Armitage and 1800 mg m −2 at Erebus Ice Tongue) c . one week after the chlorophyll a maxima. This increase was largely attributable to a corresponding increase in triacylglycerol. At the lipid maxima, triacylglycerol/polar lipid ratios in the range 1.0 to 2.5 were observed. The dynamic variations in lipid class abundances indicate that profound changes in the physiology of sea-ice diatoms are occurring throughout the spring bloom. A range of sterols (C 26 –C 30 ) were detected; 24-methylenecholesterol, brassicasterol and 24-ethylcholesterol were the major sterols at the Cape Armitage and Erebus sites. The similarity of the sterol profiles to those of Antarctic freshwater algal communities strongly indicates diatoms as a more probable source of C 29 sterols in the freshwater lakes than cyanobacteria or other algal groups. The hydrocarbons isolated from sea-ice diatoms at all sites were dominated by two unsaturated components, n−C 21:6 and a diunsaturated isoprenoid C 25 alkene. Until this study, no biological source had been validated for the isoprenoid C 25:2 diene, even though it has been detected in many estuarine and coastal sediments. |
format |
Article in Journal/Newspaper |
author |
Nichols, Peter D. Palmisano, Anna C. Rayner, Mark S. Smith, Glen A. White, David C. |
author_facet |
Nichols, Peter D. Palmisano, Anna C. Rayner, Mark S. Smith, Glen A. White, David C. |
author_sort |
Nichols, Peter D. |
title |
Changes in the lipid composition of Antarctic sea-ice diatom communities during a spring bloom: an indication of community physiological status |
title_short |
Changes in the lipid composition of Antarctic sea-ice diatom communities during a spring bloom: an indication of community physiological status |
title_full |
Changes in the lipid composition of Antarctic sea-ice diatom communities during a spring bloom: an indication of community physiological status |
title_fullStr |
Changes in the lipid composition of Antarctic sea-ice diatom communities during a spring bloom: an indication of community physiological status |
title_full_unstemmed |
Changes in the lipid composition of Antarctic sea-ice diatom communities during a spring bloom: an indication of community physiological status |
title_sort |
changes in the lipid composition of antarctic sea-ice diatom communities during a spring bloom: an indication of community physiological status |
publisher |
Cambridge University Press (CUP) |
publishDate |
1989 |
url |
http://dx.doi.org/10.1017/s0954102089000209 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102089000209 |
long_lat |
ENVELOPE(-65.939,-65.939,-68.664,-68.664) ENVELOPE(166.667,166.667,-77.850,-77.850) ENVELOPE(163.250,163.250,-78.150,-78.150) |
geographic |
Antarctic Austral McMurdo Sound Fid Armitage Cape Armitage |
geographic_facet |
Antarctic Austral McMurdo Sound Fid Armitage Cape Armitage |
genre |
Antarc* Antarctic Antarctic Science McMurdo Sound Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Science McMurdo Sound Sea ice |
op_source |
Antarctic Science volume 1, issue 2, page 133-140 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102089000209 |
container_title |
Antarctic Science |
container_volume |
1 |
container_issue |
2 |
container_start_page |
133 |
op_container_end_page |
140 |
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1792506640238379008 |