营养水平对陆生反刍动物食物网中氨基酸δ15N值的影响

Iain P. Kendall, Michael R. F. Lee, R. Evershed
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引用次数: 26

摘要

散装胶原蛋白δ15N分析被广泛用于研究过去的饮食和营养地位,但这些值是组成氨基酸δ15N值的平均值。氨基酸(AAs)的化合物特异性同位素分析有助于阐明支撑体δ15N值的复杂代谢效应。虽然在水生和陆生无脊椎动物食物网中已经研究了营养水平对个体AA δ15N值的影响,但大多数考古应用都涉及陆生食草动物,因此需要对食物链中饮食和消费者之间的这些影响有更深入的了解。北威克农场平台为在一个以黑穗草为主的多年生牧草上放牧的牛提供了基本的氮同位素信息。总体牙本质δ15N值显示了一个营养级增加的预期变化,但对导致这种值变化的潜在代谢过程的见解模糊。然而,通过测定可水解植物蛋白和牛牙本质的AA δ15N值,阐明了对消费者AA δ15N值的营养效应。研究系统的营养转移与先前研究的食物网不同,基于谷氨酸和苯丙氨酸的δ15N值的营养富集因子为4.0‰,而生态学和考古学研究通常使用的是7.6‰。这强调需要了解正在调查的特定食物网中的营养变化,以便在考古背景下应用同位素调查。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The effect of trophic level on individual amino acid δ15N values in a terrestrial ruminant food web
ABSTRACT Bulk collagen δ15N analysis is widely used to investigate past diet and trophic positions, but these values average the δ15N values of the constituent amino acids. Compound–specific isotope analysis of amino acids (AAs) can help elucidate the complex metabolic effects underpinning bulk δ15N values. Although trophic level effects on individual AA δ15N values have been investigated in aquatic and terrestrial invertebrate food webs, most archaeological applications involve terrestrial herbivores, hence a greater understanding of these effects between diet and consumer in this food chain is required. The North Wyke Farm Platform provided baseline nitrogen isotope information for cattle grazing on a Lolium perenne-dominated pasture. Bulk dentine δ15N values show a shift expected for a one trophic level increase, but obscure insight into the underlying metabolic processes that cause this change in value. However, determination of AA δ15N values of hydrolysable plant protein and cattle tooth dentine clarifies the trophic effect on consumer AA δ15N values. The observed trophic shift in the studied system is different from previously studied food webs, with a trophic enrichment factor, based on the δ15N values of glutamate and phenylalanine, of 4.0‰ compared to 7.6‰ commonly used in ecological and archaeological studies. This emphasises the need to understand the trophic shifts in the particular food web being investigated in order to apply isotopic investigations in archaeological contexts.
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