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大西洋鱼的脂肪酸同位素组成不受环境相关的食脂肪度的影响

Suzanne M Budge¹, Kathryn Townsend², Susan E Ziegler³

¹Department of Process Engineering and Applied Science, Dalhousie University, Halifax, NS, B3H 4R2, Canada. Suzanne.Budge@dal.ca.

|June 30, 2023

概括

脂肪酸 (FA) 的同位素分析有助于理解海洋食物网. 这项研究发现大西洋海肝FA中存在极小的食物分化,这表明FA生物标志物在鱼类生态学中可靠使用.

科学领域:

海洋生态海洋生态学
同位素地球化学同位素地球化学
生物标记分析生物标记分析

背景情况:

脂肪酸 (FA) 的同位素分析为食物网研究提供了潜力,但由于食物分成数据有限,特别是对于更高的捕食者而言,缺乏广泛采用.
了解FA热量歧视对于准确解释海洋生态系统中的同位素特征至关重要.

研究的目的:

为了确定大西洋鱼 (Pollachius virens) 肝脏的FA特异性热带歧视因子.
调查饮食脂肪度对FA同位素分离的影响.

主要方法:

使用大西洋鱼进行的囚禁养研究,在20周内养了三种不同脂肪度 (5-9%) 的配方饮食.
在鱼肝和相应的饮食中分析脂肪酸 δ13C值,以计算歧视因子.
在不同饮食脂肪水平中比较同位素特征.

主要成果:

肝脏FA的δ13C值与饮食中的值非常相似,大多数歧视因子<1.
饮食脂肪度通常对FA歧视因素没有显著影响.
一个值得注意的例外是22:6n-3,在养脂肪最多的鱼类中显示较低的δ13C值.

结论:

已建立的FA特定的歧视因子适用于评估海洋鱼的饮食.
这些因素提高了FA作为鱼类养生态中的有价值生物标志物的实用性.
该研究解决了关键的知识差距,促进了FA同位素分析在海洋食物网研究中的更广泛应用.

关键词:

化合物特定的同位素分析.脂质脂质是一种丰富性丰富因子 (Trophic Enrichment Factor) 是一种丰富性丰富因子.

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