Abstract
The fatty-acid composition of the deep-water Baikal amphipod Polyacanthisca calceolata Baz., 1937, that was collected in the vicinity of hydrocarbon-gas releases (near the submerged mud volcano St. Petersburg) at depths of 1300â1400 m during the international expedition Miry in Baikal was studied for the first time. Gas-chromatographyâmass-spectrometry (GCâMS) detected in the amphipod tissues 46 fatty acids, the principal ones of which were 16:0, 14:0, 18:0, 18:1n9, 16:1n7, 18:3n3, and 20:4n6. The high 18:1n9/ 18:1n7 ratio and low 16:1n7/16:0 and 20:5n3/22:6n3 ratios confirmed that the deep-water amphipod P. calceolata was a necrophage.
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