eCite Digital Repository

Lipids and Buoyancy in Southern Ocean Pteropods


Phleger, C and Nichols, P and Virtue, P, Lipids and Buoyancy in Southern Ocean Pteropods, Lipids, 32, (10) pp. 1093-1100. ISSN 0024-4201 (1997) [Refereed Article]

Copyright Statement

Copyright 1997 AOCS Press

DOI: doi:10.1007/s11745-997-0141-x


The lipids of Clione limacina, a Southern Ocean pteropod (order Gymnosomata), contain 28% diacylglyceryl ether (DAGE) (as percentage of total lipid) whereas the pteropod Limacina helicina (order Thecosomata) lacks DAGE. The alkyl glyceryl ether diols (1-O-alkyl glycerols, GE) of Clione DAGE are dominated by 16:0 (60%) and 15:0 (21%), in contrast with deep-sea shark liver DAGE, which is dominated by 18:1 GE. The fatty acid profiles of Clione and Limacina are similar (28–32% polyunsaturated, 26–34% monounsaturated) as are the sterols, which include 24-methylenecholesterol, transdehydrocholesterol, cholesterol, and desmosterol. This finding probably reflects the fact that Limacina is the major food source for Clione. Spongiobranchaea australis, another Southern Ocean pteropod (order Gymnosomata), has 0.9–1.7% DAGE, but has less lipid (3.3–4.8 mg/g lipid, wet weight) than Clione (50.8 mg/g lipid, wet weight). We propose a buoyancy role for DAGE in Clione since Limacina has bubbles for flotation which Clione lack; DAGE provides 23% more uplift than triacylglycerol at a concentration of 1.025 g/mL seawater.

Item Details

Item Type:Refereed Article
Keywords:Lipids, Buoyancy, Pteropods
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Biodiversity in Antarctic and Southern Ocean environments
UTAS Author:Virtue, P (Associate Professor Patti Virtue)
ID Code:90440
Year Published:1997
Web of Science® Times Cited:52
Deposited By:IMAS Research and Education Centre
Deposited On:2014-04-03
Last Modified:2014-07-02

Repository Staff Only: item control page