Abstract

1. 1. There is evidence that differences in algal diet are reflected in the component fatty acid compositions of the limpets found at two sites. 2. 2. The tropical species of gastropods lacking macroscopic algae in their diet suggest in several component acids a high bacterial biomass intake. 3. 3. Seasonal variations are reflected in varying proportions of saturated, monoenoic and especially polyunsaturated fatty acids. A sub-tidal gastropod although in a stable environment relative to the intertidal zone still reflected a seasonal change which is presumably metabolic in origin. 4. 4. Nonmethylene-interrupted fatty acids were detected in relatively high concentration levels in all the molluscs examined.

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