Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica
Chromatographic and mass spectrometric analysis of surface sediments from perennially ice-covered Lake Fryxell (McMurdo Dry Valleys, East Antarctica) enabled tentative identification from mass spectral data of previously unreported pentaunsaturated ketones, octatriacontapentaen-2-one (C38:5Me), nona...
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ftlouisianastuir:oai:digitalcommons.lsu.edu:geo_pubs-1635 2023-06-11T04:06:07+02:00 Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica Jaraula, Caroline M.B. Brassell, Simon C. Morgan-Kiss, Rachael M. Doran, Peter T. Kenig, Fabien 2010-04-01T07:00:00Z https://digitalcommons.lsu.edu/geo_pubs/636 https://doi.org/10.1016/j.orggeochem.2009.12.004 unknown LSU Digital Commons https://digitalcommons.lsu.edu/geo_pubs/636 doi:10.1016/j.orggeochem.2009.12.004 Faculty Publications text 2010 ftlouisianastuir https://doi.org/10.1016/j.orggeochem.2009.12.004 2023-05-28T18:16:59Z Chromatographic and mass spectrometric analysis of surface sediments from perennially ice-covered Lake Fryxell (McMurdo Dry Valleys, East Antarctica) enabled tentative identification from mass spectral data of previously unreported pentaunsaturated ketones, octatriacontapentaen-2-one (C38:5Me), nonatriacontapentaen-3-one (C39:5Et) and tetradecapentaen-2-one (C40:5Me). In addition, the C37, C38 and C40 alkenones occur as di, tri and tetraunsaturated compounds, whereas the C39 alkenones only include the tetraunsaturated components. Analysis of environmental DNA extracted from the water column of Lake Fryxell produced two 18S rDNA sequences closely related to Isochrysis spp., Chrysotila lamellosa and haptophyte sequences previously recognized in sediment samples collected from a Greenland lake and from Ace Lake, Antarctica. Based on the alkenone distribution, coupled with phylogenetic data, we propose that haptophytes related to Isochrysis and/or C. lamellosa are the source organisms of alkenones in Lake Fryxell. The occurrence of pentaunsatured alkenones may represent a response to the year-round cold water temperature (ca. 1 °C average), likely combined with oxygen supersaturation and growth under light- and nutrient-limited conditions in the upper water column. © 2009 Elsevier Ltd. All rights reserved. Text Antarc* Antarctica East Antarctica Greenland McMurdo Dry Valleys LSU Digital Commons (Louisiana State University) Ace Lake ENVELOPE(78.188,78.188,-68.472,-68.472) East Antarctica Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) Greenland Lake Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) McMurdo Dry Valleys Organic Geochemistry 41 4 386 397 |
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LSU Digital Commons (Louisiana State University) |
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ftlouisianastuir |
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unknown |
description |
Chromatographic and mass spectrometric analysis of surface sediments from perennially ice-covered Lake Fryxell (McMurdo Dry Valleys, East Antarctica) enabled tentative identification from mass spectral data of previously unreported pentaunsaturated ketones, octatriacontapentaen-2-one (C38:5Me), nonatriacontapentaen-3-one (C39:5Et) and tetradecapentaen-2-one (C40:5Me). In addition, the C37, C38 and C40 alkenones occur as di, tri and tetraunsaturated compounds, whereas the C39 alkenones only include the tetraunsaturated components. Analysis of environmental DNA extracted from the water column of Lake Fryxell produced two 18S rDNA sequences closely related to Isochrysis spp., Chrysotila lamellosa and haptophyte sequences previously recognized in sediment samples collected from a Greenland lake and from Ace Lake, Antarctica. Based on the alkenone distribution, coupled with phylogenetic data, we propose that haptophytes related to Isochrysis and/or C. lamellosa are the source organisms of alkenones in Lake Fryxell. The occurrence of pentaunsatured alkenones may represent a response to the year-round cold water temperature (ca. 1 °C average), likely combined with oxygen supersaturation and growth under light- and nutrient-limited conditions in the upper water column. © 2009 Elsevier Ltd. All rights reserved. |
format |
Text |
author |
Jaraula, Caroline M.B. Brassell, Simon C. Morgan-Kiss, Rachael M. Doran, Peter T. Kenig, Fabien |
spellingShingle |
Jaraula, Caroline M.B. Brassell, Simon C. Morgan-Kiss, Rachael M. Doran, Peter T. Kenig, Fabien Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica |
author_facet |
Jaraula, Caroline M.B. Brassell, Simon C. Morgan-Kiss, Rachael M. Doran, Peter T. Kenig, Fabien |
author_sort |
Jaraula, Caroline M.B. |
title |
Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica |
title_short |
Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica |
title_full |
Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica |
title_fullStr |
Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica |
title_full_unstemmed |
Origin and tentative identification of tri to pentaunsaturated ketones in sediments from Lake Fryxell, East Antarctica |
title_sort |
origin and tentative identification of tri to pentaunsaturated ketones in sediments from lake fryxell, east antarctica |
publisher |
LSU Digital Commons |
publishDate |
2010 |
url |
https://digitalcommons.lsu.edu/geo_pubs/636 https://doi.org/10.1016/j.orggeochem.2009.12.004 |
long_lat |
ENVELOPE(78.188,78.188,-68.472,-68.472) ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(163.183,163.183,-77.617,-77.617) |
geographic |
Ace Lake East Antarctica Fryxell Greenland Lake Fryxell McMurdo Dry Valleys |
geographic_facet |
Ace Lake East Antarctica Fryxell Greenland Lake Fryxell McMurdo Dry Valleys |
genre |
Antarc* Antarctica East Antarctica Greenland McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctica East Antarctica Greenland McMurdo Dry Valleys |
op_source |
Faculty Publications |
op_relation |
https://digitalcommons.lsu.edu/geo_pubs/636 doi:10.1016/j.orggeochem.2009.12.004 |
op_doi |
https://doi.org/10.1016/j.orggeochem.2009.12.004 |
container_title |
Organic Geochemistry |
container_volume |
41 |
container_issue |
4 |
container_start_page |
386 |
op_container_end_page |
397 |
_version_ |
1768377890464858112 |