Phase transitions of wax esters adjust buoyancy in diapausing Calanoides acutus
We study the composition and biophysical properties of wax esters extracted from the Antarctic copepod, Calanoides acutus, to explore if these factors adjust buoyancy in diapausing copepods. Levels of wax ester in the copepods were correlated with depth, with deeper animals containing higher amounts...
Published in: | Limnology and Oceanography |
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American Society of Limnology and Oceanography
2011
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ftnerc:oai:nora.nerc.ac.uk:15295 2023-05-15T13:45:11+02:00 Phase transitions of wax esters adjust buoyancy in diapausing Calanoides acutus Pond, David W. Tarling, Geraint A. 2011 http://nora.nerc.ac.uk/id/eprint/15295/ http://www.aslo.org/lo/toc/vol_56/issue_4/1310.html unknown American Society of Limnology and Oceanography Pond, David W.; Tarling, Geraint A. orcid:0000-0002-3753-5899 . 2011 Phase transitions of wax esters adjust buoyancy in diapausing Calanoides acutus. Limnology and Oceanography, 56 (4). 1310-1318. https://doi.org/10.4319/lo.2011.56.4.1310 <https://doi.org/10.4319/lo.2011.56.4.1310> Marine Sciences Biology and Microbiology Publication - Article PeerReviewed 2011 ftnerc https://doi.org/10.4319/lo.2011.56.4.1310 2023-02-04T19:29:48Z We study the composition and biophysical properties of wax esters extracted from the Antarctic copepod, Calanoides acutus, to explore if these factors adjust buoyancy in diapausing copepods. Levels of wax ester in the copepods were correlated with depth, with deeper animals containing higher amounts. An unsaturation index was used to determine the proportions of polyunsaturated wax esters in the oil sac of the copepods. The proportion of polyunsaturated wax ester in copepods that had descended to depth was always close to 50% and attributable to high amounts of the diatom biomarker fatty acid 20:5(n-3) contained in these storage lipids. High-pressure differential scanning calorimetry indicated that wax esters with such high levels of unsaturation exhibited unusual properties, changing from a liquid to a solid phase at pressures and temperatures below 500 m in the ocean. The dense, solid wax esters reduce the overall buoyancy of the lipid-rich copepods at depth and help facilitate neutral buoyancy. The composition of wax esters is a key factor in buoyancy control in these organisms during diapause. Article in Journal/Newspaper Antarc* Antarctic Copepods Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Limnology and Oceanography 56 4 1310 1318 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Marine Sciences Biology and Microbiology |
spellingShingle |
Marine Sciences Biology and Microbiology Pond, David W. Tarling, Geraint A. Phase transitions of wax esters adjust buoyancy in diapausing Calanoides acutus |
topic_facet |
Marine Sciences Biology and Microbiology |
description |
We study the composition and biophysical properties of wax esters extracted from the Antarctic copepod, Calanoides acutus, to explore if these factors adjust buoyancy in diapausing copepods. Levels of wax ester in the copepods were correlated with depth, with deeper animals containing higher amounts. An unsaturation index was used to determine the proportions of polyunsaturated wax esters in the oil sac of the copepods. The proportion of polyunsaturated wax ester in copepods that had descended to depth was always close to 50% and attributable to high amounts of the diatom biomarker fatty acid 20:5(n-3) contained in these storage lipids. High-pressure differential scanning calorimetry indicated that wax esters with such high levels of unsaturation exhibited unusual properties, changing from a liquid to a solid phase at pressures and temperatures below 500 m in the ocean. The dense, solid wax esters reduce the overall buoyancy of the lipid-rich copepods at depth and help facilitate neutral buoyancy. The composition of wax esters is a key factor in buoyancy control in these organisms during diapause. |
format |
Article in Journal/Newspaper |
author |
Pond, David W. Tarling, Geraint A. |
author_facet |
Pond, David W. Tarling, Geraint A. |
author_sort |
Pond, David W. |
title |
Phase transitions of wax esters adjust buoyancy in diapausing Calanoides acutus |
title_short |
Phase transitions of wax esters adjust buoyancy in diapausing Calanoides acutus |
title_full |
Phase transitions of wax esters adjust buoyancy in diapausing Calanoides acutus |
title_fullStr |
Phase transitions of wax esters adjust buoyancy in diapausing Calanoides acutus |
title_full_unstemmed |
Phase transitions of wax esters adjust buoyancy in diapausing Calanoides acutus |
title_sort |
phase transitions of wax esters adjust buoyancy in diapausing calanoides acutus |
publisher |
American Society of Limnology and Oceanography |
publishDate |
2011 |
url |
http://nora.nerc.ac.uk/id/eprint/15295/ http://www.aslo.org/lo/toc/vol_56/issue_4/1310.html |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Copepods |
genre_facet |
Antarc* Antarctic Copepods |
op_relation |
Pond, David W.; Tarling, Geraint A. orcid:0000-0002-3753-5899 . 2011 Phase transitions of wax esters adjust buoyancy in diapausing Calanoides acutus. Limnology and Oceanography, 56 (4). 1310-1318. https://doi.org/10.4319/lo.2011.56.4.1310 <https://doi.org/10.4319/lo.2011.56.4.1310> |
op_doi |
https://doi.org/10.4319/lo.2011.56.4.1310 |
container_title |
Limnology and Oceanography |
container_volume |
56 |
container_issue |
4 |
container_start_page |
1310 |
op_container_end_page |
1318 |
_version_ |
1766215860697956352 |