Abstract
Fatty acid composition of the liver, brown fat, thigh muscle and heart of Sorex araneus and Neomys fodiens was determined by GLC and GLC-MS. In both species of shrew the total amounts of ωJ3-PUFAs in the phospholipids were greater than those in the triglycerides. Sorex araneus, which feeds solely on a terrestrial diet, had a larger total amount of ω6-PUFAs in the triglycerides of the brown fat. The phospholipids of the thigh muscle and heart of Neomys fodiens, however, contained more ω6-PUFAs than did those of Sorex araneus. These results suggest that the fatty acid composition of the membrane phospholipids of shrews is largely genetically regulated and is affected by diet less than the composition of triglycerides. The main C 16-monounsaturated fatty acid of most of the specimens studied was 16:lω5, which is unusual among mammals.
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