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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
Stable Carbon Isotopic Composition of Lipids of Hydrocarbon Seep Mussels and Whitefish, Carbon Flow Implications
Jiasong Fang, Paul A. Comet, James M. Brooks, Roger Sassen (1)
ABSTRACT
The individual fatty acids of hydrocarbon seep mussels (seep mytilid II) and whitefish exhibit very light 
13C values, from -50.0
to -57.9, and from -25.2 to -27.1, respectively. Unsaturated fatty acids have lighter 13C than saturated ones. The variations in 13C are up to 5.1 (mussel #1), 6.7 (mussel #2), and 2.7 (whitefish). A kinetic isotopic effect in the biosynthesis of fatty acids and intermolecular isotope fractionation during fatty acid desaturation and elongation is suggested to account for the observed distribution pattern. The systematic decrease of 13C in the order of mussel body, gill, and fatty acids, reflects the pathway of carbon flow as well as the biosynthetic locus in the mussels-bacteria system.
Fatty acids of whitefish have significantly heavier 13C compared to those of mussels, reflecting distinctly different food source of the the animals.
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