2016
DOI: 10.1002/ecs2.1511
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Embracing variability in amino acid δ15N fractionation: mechanisms, implications, and applications for trophic ecology

Abstract: Abstract. Compound-specific stable isotope analysis (CSIA) of individual amino acids (AAs) has become a powerful analytical tool in trophic ecology. Heavily fractionating "trophic" AAs (e.g., glutamic acid: Glu) provide a robust indicator of trophic transfer, while minimally fractionating "source" AAs (e.g., phenylalanine: Phe) closely reflect the δ 15 N value at the base of the food web (δ 15 N baseline ). Together, the CSIA-AA approach provides an unprecedented ability to disentangle the influences of δ 15 N… Show more

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Cited by 286 publications
(496 citation statements)
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References 123 publications
(328 reference statements)
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“…The majority of studies have used the difference between two amino acids, glutamate and phenylalanine (Glu and Phe), as the two ‘canonical’ ‘trophic’ and ‘source’ amino acids, but some have suggested using a different combination, or a multiple amino acid approach (Popp et al 2007; Nielsen et al 2015; McMahon and McCarthy 2016). …”
Section: Introductionmentioning
confidence: 99%
“…The majority of studies have used the difference between two amino acids, glutamate and phenylalanine (Glu and Phe), as the two ‘canonical’ ‘trophic’ and ‘source’ amino acids, but some have suggested using a different combination, or a multiple amino acid approach (Popp et al 2007; Nielsen et al 2015; McMahon and McCarthy 2016). …”
Section: Introductionmentioning
confidence: 99%
“…In contrast, values of TDF Glu higher than 8.0& are expected for consumers with a PE lower than 28% (i.e., lower production flux and/or higher assimilation flux) (McMahon et al 2015). According to published data on controlled feeding experiments that were summarized in McMahon and McCarthy (2016), the TDF Glu value ranged from 0.3 to 19.4& among various combinations of consumer and prey, which is equivalent with 0.5-95% in PE (Goto et al 2018), if the microbe-mediated effect is not considered. It should be noted that consumers (dobsonfly larvae) with no ingestion flux (i.e., starved) show a nearly normal TDF Glu value of 7.5 ± 0.5& (n = 5), suggesting that their metabolic energy is compensated by catabolizing storage lipids or carbohydrates (Ishikawa et al 2017b).…”
Section: Trophic Transfer Efficiency (Tte)mentioning
confidence: 99%
“…2) (Goto et al 2018). Values of TDF Glu lower than 8.0& are expected for consumers with a higher production flux (i.e., PE's numerator) (McMahon and McCarthy 2016) or consumers with a lower assimilation flux (i.e., PE's denominator) . In contrast, values of TDF Glu higher than 8.0& are expected for consumers with a PE lower than 28% (i.e., lower production flux and/or higher assimilation flux) (McMahon et al 2015).…”
Section: Trophic Transfer Efficiency (Tte)mentioning
confidence: 99%
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