Lipid composition of the euphausiids Euphausia vallentini and Thysanoessa macrura during summer in the Southern Indian Ocean
Lipid composition of the euphausiids Euphausia vallentini and Thysanoessa macrura during summer in the Southern Indian Ocean
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DOI：
10.1017/s0954102003001573
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发表时间：
2003-12
影响因子：
1.6
通讯作者：
P. Mayzaud;M. Boutoute;F. Alonzo
中科院分区：
文献类型：
--
作者：
P. Mayzaud;M. Boutoute;F. Alonzo
分析了南印度洋的两种真甲鱼(Thysanoessa macrura Sars和Euphausia vallentini Stebding)的脂肪含量、脂肪酸和脂肪醇组成与发育阶段(T.M)和性别(E.V)的关系。脂肪组成分析表明，蜡酯类和三酰甘油类脂类分别是大型毛滴虫和瓦伦特毛霉的主要中性脂类。脂类和总脂之间的异速生长关系表明，总脂的变化是大小依赖的，主要与巨型毛虾的蜡酯和瓦伦蒂鱼的极性脂(磷脂酰胆碱或PC和磷脂酰乙醇胺或PE)有关。雌雄在脂肪组成上无明显差异，但取样地点、发育阶段和性别对大斑绒茧蜂有显著影响。在这一物种中，蜡酯在幼体和雌性阶段表现出相对相似的脂肪酸和酒精组成，而雌性和幼体在极性脂方面存在显著差异，雌性的PE含量很低。雌雄之间的脂肪酸结构差异不大，但雌体的PC在22：6N-3中含量较低。通过多元判别分析确定了这两个物种的营养状况，这表明瓦伦蒂鱼具有一定程度的杂食性，而它们似乎比南大洋其他地区采集的个体更具杂食性。极脂组成的聚集性表明PC脂肪酸的差异与收集的瓦伦蒂尼雌体产卵后阶段之间存在联系。同样的情况可能也适用于记录到的雌性斑潜蝇的PE变化。
Two species of euphausiids (Thysanoessa macrura Sars and Euphausia vallentini Stebbing) from the Southern Indian Ocean were analysed for their lipid content, fatty acid and fatty alcohol composition, in relation to developmental stage (T.m) and sex (E.v). Lipid composition showed wax esters and triacylglycerols as main neutral lipids for T. macrura and E. vallentini respectively. Allometric relationships between lipid class and total lipids indicated that changes in total lipids were size dependent and mainly related to wax esters in T. macrura and polar lipids (both phosphatidylcholine or PC and phosphatidylethanolamine or PE) in E. vallentini. No difference in lipid composition could be shown for male and female E. vallentini, while sampling location, developmental stage and sex were significantly influential in T. macrura. In this latter species wax esters displayed relatively similar fatty acid and alcohol composition in both juvenile and female stages, whereas a striking difference could be seen between females and juveniles in terms of polar lipids with a very low PE content in females. Male and female E. vallentini showed little differences in fatty acid structure with the exception of PC in females, which were low in 22:6n-3. The trophic status of these two species was established using multivariate discriminant analysis, which indicated for E. vallentini a degree of omnivory similar to E. superba, while these T. macrura appeared more omnivorous than individuals collected in other areas of the Southern Ocean. Clustering of polar lipid composition suggested a link between differences in PC fatty acid and the post-spawn stage of the female of E. vallentini collected. The same probably applies for the changes in PE recorded for T. macrura females.