The effect of trophic level on individual amino acid δ15N values in a terrestrial ruminant food web

A - Papers appearing in refereed journals

Kendall, I. P., Lee, M. R. F. and Evershed, R. P. 2018. The effect of trophic level on individual amino acid δ15N values in a terrestrial ruminant food web. STAR: Science and Technology of Archaeological Research. 3 (1), pp. 135-145.

AuthorsKendall, I. P., Lee, M. R. F. and Evershed, R. P.
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.

KeywordsNitrogen isotopes; Controlled diet; Dentine collagen; Lolium perenne; Cattle
Year of Publication2018
JournalSTAR: Science and Technology of Archaeological Research
Journal citation3 (1), pp. 135-145
Digital Object Identifier (DOI)doi:10.1080/20548923.2018.1459361
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeThe North Wyke Farm Platform- National Capability [2017-22]
Publisher's version
Copyright license
CC BY
Output statusPublished
Publication dates
Online03 May 2018
Publication process dates
Accepted15 Mar 2018
PublisherTaylor & Francis
ISSN2054-8923

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