Source and Fate of Lipids in Polar Gelatinous Zooplankton
The presence or absence of accumulated lipids in arctic and Antarctic medusae and ctenophores was determined by visual examination of living specimens with a dissecting microscope. Lipid accumulations were obvious because of their high refractive indices. Lipids were seen in many of the 200+ gelatin...
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1989
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ftunivcalgaryojs:oai:journalhosting.ucalgary.ca:article/64729 2023-05-15T13:54:49+02:00 Source and Fate of Lipids in Polar Gelatinous Zooplankton Larson, R.J. Harbison, G.R. 1989-01-01 application/pdf https://journalhosting.ucalgary.ca/index.php/arctic/article/view/64729 eng eng The Arctic Institute of North America https://journalhosting.ucalgary.ca/index.php/arctic/article/view/64729/48643 https://journalhosting.ucalgary.ca/index.php/arctic/article/view/64729 ARCTIC; Vol. 42 No. 4 (1989): December: 299–396; 339-346 1923-1245 0004-0843 Animal anatomy Animal food Copepoda Ctenophora Lipids Predation Starvation Zooplankton Antarctic waters Arctic waters info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion research-article 1989 ftunivcalgaryojs 2022-03-22T21:21:53Z The presence or absence of accumulated lipids in arctic and Antarctic medusae and ctenophores was determined by visual examination of living specimens with a dissecting microscope. Lipid accumulations were obvious because of their high refractive indices. Lipids were seen in many of the 200+ gelatinous zooplankton specimens collected. They always consisted of various-sized droplets and larger masses within the lumen of the gastrovascular system. No true depot lipids or adipose tissue were present. The accumulation of lipids was observed in feeding animals, suggesting that the prey-derived lipids were unmodified. Disappearance of lipids in starved animals suggested that lipids are taken up and assimilated. In medusae, they occurred in the stomach, ring and/or radial canals. In most ctenophores, lipids were found in the meridional canals below the comb rows. However, in one ctenophore species, Mertensia ovum, lipids are stored in special sacs associated with the tentacle bulbs. Lipids were more frequently observed in arctic than in Antarctic gelatinous zooplankton. A review of the literature suggests that in the Antarctic, the average lipid content of gelatinous predators is about 3% DW (range = 0.4-6%), whereas in the Arctic it is nearly three times higher, about 8% DW (range = 1.5-22%). These differences are probably related to the amounts of lipids in their prey. The abundance of lipid-rich Calanus spp. copepods in the Arctic may be responsible for the high levels of lipids in gelatinous predators.Key words: lipids, gelatinous zooplankton, ctenophores, medusae, Arctic, Antarctic, polar, feeding, starvation Mots clés: lipides, zooplancton gélatineux, cténaires, méduses, Arctique, Antarctique, polaire, alimentation, état de jeûne Article in Journal/Newspaper Antarc* Antarctic Antarctique* Arctic Arctic Arctique* Zooplankton Copepods University of Calgary Journal Hosting Antarctic Arctic The Antarctic ARCTIC 42 4 |
institution |
Open Polar |
collection |
University of Calgary Journal Hosting |
op_collection_id |
ftunivcalgaryojs |
language |
English |
topic |
Animal anatomy Animal food Copepoda Ctenophora Lipids Predation Starvation Zooplankton Antarctic waters Arctic waters |
spellingShingle |
Animal anatomy Animal food Copepoda Ctenophora Lipids Predation Starvation Zooplankton Antarctic waters Arctic waters Larson, R.J. Harbison, G.R. Source and Fate of Lipids in Polar Gelatinous Zooplankton |
topic_facet |
Animal anatomy Animal food Copepoda Ctenophora Lipids Predation Starvation Zooplankton Antarctic waters Arctic waters |
description |
The presence or absence of accumulated lipids in arctic and Antarctic medusae and ctenophores was determined by visual examination of living specimens with a dissecting microscope. Lipid accumulations were obvious because of their high refractive indices. Lipids were seen in many of the 200+ gelatinous zooplankton specimens collected. They always consisted of various-sized droplets and larger masses within the lumen of the gastrovascular system. No true depot lipids or adipose tissue were present. The accumulation of lipids was observed in feeding animals, suggesting that the prey-derived lipids were unmodified. Disappearance of lipids in starved animals suggested that lipids are taken up and assimilated. In medusae, they occurred in the stomach, ring and/or radial canals. In most ctenophores, lipids were found in the meridional canals below the comb rows. However, in one ctenophore species, Mertensia ovum, lipids are stored in special sacs associated with the tentacle bulbs. Lipids were more frequently observed in arctic than in Antarctic gelatinous zooplankton. A review of the literature suggests that in the Antarctic, the average lipid content of gelatinous predators is about 3% DW (range = 0.4-6%), whereas in the Arctic it is nearly three times higher, about 8% DW (range = 1.5-22%). These differences are probably related to the amounts of lipids in their prey. The abundance of lipid-rich Calanus spp. copepods in the Arctic may be responsible for the high levels of lipids in gelatinous predators.Key words: lipids, gelatinous zooplankton, ctenophores, medusae, Arctic, Antarctic, polar, feeding, starvation Mots clés: lipides, zooplancton gélatineux, cténaires, méduses, Arctique, Antarctique, polaire, alimentation, état de jeûne |
format |
Article in Journal/Newspaper |
author |
Larson, R.J. Harbison, G.R. |
author_facet |
Larson, R.J. Harbison, G.R. |
author_sort |
Larson, R.J. |
title |
Source and Fate of Lipids in Polar Gelatinous Zooplankton |
title_short |
Source and Fate of Lipids in Polar Gelatinous Zooplankton |
title_full |
Source and Fate of Lipids in Polar Gelatinous Zooplankton |
title_fullStr |
Source and Fate of Lipids in Polar Gelatinous Zooplankton |
title_full_unstemmed |
Source and Fate of Lipids in Polar Gelatinous Zooplankton |
title_sort |
source and fate of lipids in polar gelatinous zooplankton |
publisher |
The Arctic Institute of North America |
publishDate |
1989 |
url |
https://journalhosting.ucalgary.ca/index.php/arctic/article/view/64729 |
geographic |
Antarctic Arctic The Antarctic |
geographic_facet |
Antarctic Arctic The Antarctic |
genre |
Antarc* Antarctic Antarctique* Arctic Arctic Arctique* Zooplankton Copepods |
genre_facet |
Antarc* Antarctic Antarctique* Arctic Arctic Arctique* Zooplankton Copepods |
op_source |
ARCTIC; Vol. 42 No. 4 (1989): December: 299–396; 339-346 1923-1245 0004-0843 |
op_relation |
https://journalhosting.ucalgary.ca/index.php/arctic/article/view/64729/48643 https://journalhosting.ucalgary.ca/index.php/arctic/article/view/64729 |
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ARCTIC |
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42 |
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4 |
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