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Lipid composition and partitioning of deepwater chondrichthyans: inferences of feeding ecology and distribution
journal contribution
posted on 2023-05-17, 05:23 authored by Pethybridge, HR, Daley, R, Patti VirtuePatti Virtue, Nichols, PDThe composition of lipids and fatty acids was determined for the livers, muscle, pancreas, kidney and stomach Xuids of deepwater chondrichthyan species (including 11 squaliformes, 3 chimaeriformes, 1 hexanchiforme and 3 carcharhiniformes) caught as bycatch from continental waters oV south-eastern Australia. The lipid class, fatty acid and fatty alcohol composition diVered markedly in each tissue and in each species. The lipid and fatty acid composition of large, lipid-rich (38–70% wet weight, ww) livers demonstrated the multifunctional role of this organ in: lipid distribution, storage and biosynthesis, and buoyancy regulation. In the liver, the importance of certain lipids (including squalene, diacylglyceryl ethers, triacylglycerols and to a lesser extent wax esters) as mediators of buoyancy varied according to lifestyle and habitat. Less variability was observed in the muscle proWles, characterized by low lipid content (<1.0% ww) and high relative levels of polar lipids (>70%). The lipid and fatty acid proWles of the kidney and pancreas showed the highest intraspeciWc variability, suggesting these organs also have complex roles in lipid storage and metabolism. Overall intra- and interspeciWc diVerences in the tissue fatty acid proWles could be related to diVerences in a number of factors including phylogeny, habitat (depth), buoyancy regulation and diet and presumably also reXect diVerent ecological roles. The lipid and fatty acid proWles are the Wrst published for Rhinochimaera paciWca, Chimaera lignaria and Figaro boardmani and the Wrst to demonstrate interspeciWc variation in lipid proWles of various tissues of deepwater chondrichthyans. The application of multivariate analysis to lipid class and fatty acid tissue proWles in chondrichthyans inferred dietary diVerences and metabolic preferences between species and habitats. These results have important implications for the future use of fatty acids as dietary tracers in chondrichthyan research.
History
Publication title
Marine Biology: International Journal on Life in Oceans and Coastal WatersVolume
157Issue
6Pagination
1367-1384ISSN
0025-3162Department/School
Institute for Marine and Antarctic StudiesPublisher
Springer-VerlagPlace of publication
175 Fifth Ave, New York, USA, Ny, 10010Rights statement
The final publication is available at http://www.springerlink.comRepository Status
- Restricted