| 摘要: |
| 研究了4 种海洋微藻的脂肪酸组成。研究结果显示, 锥状斯氏藻(Scrippsiella trochoidea)和海洋原甲藻(Prorocentrum micans)的主要脂肪酸有16:0、18:4ω3、18:5ω3、20:3ω6、22:6ω3, 中肋骨条藻(Skeletonema costatum)和角毛藻(Chaetoceros sp.)的主要脂肪酸为14:0、16:0、16:1ω7、20:5ω3。两种甲藻和两种硅藻分别都表现出典型的甲藻门和硅藻门的脂肪酸特征。从总脂肪酸、PUFA、ω3 和ω6脂肪酸的含量来看, 单位干质量的两种甲藻能够比两种硅藻提供更多的脂肪酸类营养物质。但是某些动物生长发育所必需的脂肪酸(如20:5ω3)在硅藻中的含量却高于甲藻。因此实际应用中单种饵料往往不能提供足够的营养物质, 通常需要将不同饵料混合以获得营养价值更高的饵料。对4 种微藻的脂肪酸组成进行聚类分析和主成分分析, 结果不仅反映了4 种微藻在分类上亲缘关系的远近, 也反映了几种微藻各自的脂肪酸组成特征。 |
| 关键词: 甲藻 硅藻 脂肪酸 |
| DOI： |
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| 基金项目:中国科学院知识创新工程重要方向项目(KZCX2-YW-213-3); 国家自然科学基金资助项目(40821004,40776092); IPY 中国行动计划 |
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| Comparative study of fatty acid compositions of two dinoflagellates and two diatoms |
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LIU Meng-tan,LI Chao-lun,SUN Song
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| Abstract: |
| Fatty acid compositions, an important index of nutrition, were analyzed for four algae, Scrippsiella trochoidea, Prorocentrum micans, Skeletonema costatum and Chaetoceros sp.. For S. trochoidea and P. micans, the dominance of 16:0, 18:4ω3, 18:5ω3, 20:3ω6, 22:6ω3 indicated a typical fatty acid composition of dinoflagellates. For S. costatum and Chaetoceros sp., the dominant fatty acids were 14:0, 16:0, 16:1ω7, and 20:5ω3, suggesting a diatom feature. It could be inferred that dinoflagellates could offer more nutritional fatty acids than the two diatoms based on the contents of total fatty acid, PUFA, ω3, and ω6 fatty acids. However, to the grazers, some essential fatty acids such as 20:5ω3 etc. were exclusively abundant in diatoms, which suggested that unialgae could hardly provide comprehensive nutrients and mixed algae would be a better choice. Principal component analysis and cluster analysis were employed in the chemotaxonomy of these algae. S. trochoidea and P.micans were close to each other in systematic status according to their concentrated distributions in the principal component analysis plot and the cluster plot. Although grouped in the same class in the cluster plot, S. costatum and Chaetoceros sp. were distributed away from each other along principal component 2, indicating their different taxonomy status in Bacillariophyceae. |
| Key words: dinoflagellates diatom fatty acid |
