Käkelä R, Hyvärinen H
Department of Biology, University of Joensuu, Finland.
Comp Biochem Physiol B Biochem Mol Biol. 1998 Jun;120(2):231-7. doi: 10.1016/s0305-0491(98)10012-3.
Fatty acid composition in the liver of four ringed-seal (Phoca hispida ssp.) populations, from ocean (Spitsbergen), brackish water (the Baltic Sea) and freshwater (Lake Saimaa and Lake Ladoga) were determined by gas liquid chromatography. The fatty acid compositions in liver were compared with those of the blubber of the seals, which largely reflect the fatty acid supply from marine or freshwater fish. When the ratios of 20:4n-6/20:5n-3 (arachidonic acid/eicosapentaenoic acid, AA/EPA, from 0.06 to 0.55) and n-6 PUFA/n-3 PUFA (n-6/n-3, from 0.09 to 0.35) increased from the marine to freshwater blubber, the corresponding increase in these ratios in the total lipids of the liver was 10-fold or more (AA/EPA: from 1.2 to 13.5 and n-6/n-3: from 0.9 to 3.2). Thus, when available in the diet, AA is preferentially incorporated into the lipids of pinniped liver.
采用气液色谱法测定了来自海洋（斯瓦尔巴群岛）、半咸水（波罗的海）和淡水（塞马湖和拉多加湖）的四个环斑海豹（Phoca hispida ssp.）种群肝脏中的脂肪酸组成。将肝脏中的脂肪酸组成与海豹皮下脂肪的脂肪酸组成进行了比较，海豹皮下脂肪很大程度上反映了来自海洋或淡水鱼类的脂肪酸供应情况。当20:4n-6/20:5n-3（花生四烯酸/二十碳五烯酸，AA/EPA，从0.06至0.55）和n-6多不饱和脂肪酸/n-3多不饱和脂肪酸（n-6/n-3，从0.09至0.35）的比例从海洋海豹皮下脂肪到淡水海豹皮下脂肪有所增加时，肝脏总脂质中这些比例的相应增加幅度为10倍或更多（AA/EPA：从1.2至13.5，n-6/n-3：从0.9至3.2）。因此，当饮食中可获取花生四烯酸时，它会优先掺入鳍足类动物肝脏的脂质中。
