Fatty acid composition in deep hydrothermal vent symbiotic bivalves.
Fatty acid composition in deep hydrothermal vent symbiotic bivalves.
复制标题
深热液喷口共生双壳类动物的脂肪酸组成。
作者：
F. Ben;J. Marty;A. Fiala
对深部热液喷口双壳类中的脂肪酸进行了分析。它们的组成与地中海采集的滨海贻贝完全不同。滨海贻贝的脂肪酸分布以多不饱和脂肪酸(20：5n-3，22：6n-3)为主，反映了食物的浮游来源。双壳类脂肪酸的分布主要由16：1n-7、18：1n-7和20：1n-7的单不饱和酸(n-7位的双键)所控制，它们显然是细菌的来源，表明了双壳类中共生细菌的活性。观察到了来自两个热液地点(北纬13度和加拉帕戈斯)的双壳类脂肪酸组成的差异以及地幔和鳃之间的差异，并就两个地点的喷口活动和物种代谢能力作为生态条件的函数进行了讨论。
Fatty acids in deep hydrothermal vent bivalves have been analyzed. Their composition is completely different from that of a littoral mussel collected in the Mediterranean sea. The distribution of fatty acids in the littoral mussel is characterized by a predominance of polyunsaturated fatty acids (20:5n-3, 22:6n-3) reflecting the planktonic origin of the food. Vent bivalve fatty acid distribution is dominated by an abundance of the monounsaturated acids (double bond in the n-7 position) 16:1n-7, 18:1n-7, and 20:1n-7 which are clearly of bacterial origin and give an indication of the symbiotic bacterial activity in the bivalves. Differences between the fatty acid composition of the bivalves from two hydrothermal sites (13 degrees N and Galapagos) and differences between the mantle and the gill were observed and are discussed with respect to vent activities at the two sites and species metabolic capacities as a function of ecological conditions.