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南部海中氨基酸的组织特异性碳同位素模式

Alana L Robinson¹, Emma A Elliott Smith^2,3, Alexi C Besser^2,4

¹Department of Biology, University of New Mexico, Albuquerque, NM, 87131, USA. alanalea@unm.edu.

|January 16, 2024

概括

氨基酸 (AAs) 的稳定同位素分析揭示了新陈代谢和组织合成如何影响南部海中的碳 (δ¹³C) 值. 不同的组织显示出不同的AA δ¹³C值,影响了对饮食的生态解释.

科学领域:

稳定的同位素生态学
海洋哺乳动物生态生理学
生物地质化学生物地质化学

背景情况:

对单个氨基酸 (AAs) 的稳定同位素分析是动物生态学的强大工具.
了解新陈代谢和组织合成对AA稳定同位素值的影响至关重要.
南部海的个体饮食专业化为这项研究提供了独特的数据集.

研究的目的:

研究组织合成和新陈代谢对基本 (AA) 和非基本 (AA) 氨基酸碳同位素 (δ¹³C) 值的影响.
在不同组织 (骨原蛋白,胡须,肌肉,肝脏) 中探索AA δ 13 C值的个体内变化.
评估这种变化如何影响野生群体对饮食的生态解释.

主要方法:

测量碳同位素 (δ¹³C) 对单个必需和非必需氨基酸的值.
对十只南海水母的骨原蛋白,胡须,肌肉和肝脏组织的分析.
统计分析以确定组织之间AA δ¹³C值的显著差异.

主要成果:

对特定非必需的AAs (谷氨酸,氨酸,氨酸,血清素,甘氨酸) 和基本的AA threonine在组织中观察到C值的显著差异.
肝脏中较高的氨酸 δ 13 C 值表明葡萄糖生成的代谢,由与甘氨酸和氨酸的相关性支持.
个体内同位素变化导致60%分析的海的饮食来源解释有所不同.

结论:

代谢过程,特别是葡萄糖生成,显著影响肉食海洋哺乳动物的AA_ESS和AA_NESS δ¹³C值.
组织特定的同位素值可能会导致关于饮食和热量关系的不同的生态结论.
仔细考虑代谢效应和组织选择对于准确的基于稳定同位素的生态研究至关重要.

关键词:

化合物特定的稳定同位素分析.基本的氨基酸 δ 13C 指纹.葡萄糖的产生和生成.代谢过程中的代谢.生理学生理学生理学

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