Estimating δ15N fractionation and adjusting the lipid correction equation using Southern African freshwater fishes

Taylor, Geraldine C; Hill, Jaclyn M; Jackson, Michelle C; Peel, Richard A; Weyl, Olaf L F

Title: Estimating δ15N fractionation and adjusting the lipid correction equation using Southern African freshwater fishes
Creator: Taylor, Geraldine C
Creator: Hill, Jaclyn M
Creator: Jackson, Michelle C
Creator: Peel, Richard A
Creator: Weyl, Olaf L F
Date Issued: 2017
Date: 2017
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/69124
Identifier: vital:29392
Identifier: https://0-doi.org.wam.seals.ac.za/10.1371/journal.pone.0178047
Description: Stable isotope analysis is an important tool for characterising food web structure; however, interpretation of isotope data can often be flawed. For instance, lipid normalisation and trophic fractionation values are often assumed to be constant, but can vary considerably between ecosystems, species and tissues. Here, previously determined lipid normalisation equations and trophic fractionation values were re-evaluated using freshwater fish species from three rivers in the Upper Zambezian floodplain ecoregion in southern Africa. The parameters commonly used in lipid normalisation equations were not correct for the 18 model species (new D and I parameters were estimated as D = 4.46‰ [95% CI: 2.62, 4.85] and constant I = 0 [95% CI: 0, 0.17]). We suggest that future isotopic analyses on freshwater fishes use our new values if the species under consideration do not have a high lipid content in their white muscle tissue. Nitrogen fractionation values varied between species and river basin; however, the average value closely matched that calculated in previous studies on other species (δ15N fractionation factor of 3.37 ± 1.30 ‰). Here we have highlighted the need to treat stable isotope data correctly in food web studies to avoid misinterpretation of the data.
Format: 11 pages
Format: pdf
Language: English
Relation: PloS One
Relation: Taylor, G.C., Hill, J.M., Jackson, M.C., Peel, R.A. and Weyl, O.L., 2017. Estimating δ15N fractionation and adjusting the lipid correction equation using Southern African freshwater fishes. PloS one, 12(5), p.e0178047.
Relation: PloS One volume 12 number 5 May 2017 1932-6203
Rights: PLoS One
Rights: Use of this resource is governed by the terms and conditions of the PLoSOne Open Access Statement

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Hill, Jaclyn Marie (Ms)

Weyl, Olaf L F (Prof)

RU Department of Ichthyology and Fisheries Science

SDG 14. Life Below Water

RU South African Institute for Aquatic Biodiversity (SAIAB)

RU Department of Zoology and Entomology

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