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dc.contributor.authorJacobi, Cristina Mariana
dc.contributor.authorVillamarin, Francisco
dc.contributor.authorJardine, Timothy D
dc.contributor.authorMagnusson, William Ernest
dc.description.abstractStable isotope ratios of nitrogen (δ15N) have been used to estimate trophic position (TP) of organisms due to the predictable enrichment of nitrogen‐15 in consumer tissues relative to their diet. We explored estimates of trophic position using liver and muscle δ15N and stomach content analysis in a broad size range of Arapaima sp. from Amazonian floodplain lakes. Estimates of TP based on liver δ15N were more closely related to the stomach content data than estimates based on muscle δ15N, possibly because of the higher turnover of nitrogen in liver. Total length and season explained most of the variation in TP values estimated from δ15N, showing that they have more effect than prey trophic position on δ15N values. The TP estimated by identification of stomach content was 3.6 and was unrelated to the size of the arapaima. This highlights the need for a better understanding of the factors that affect values of δ15N and stomach content analysis is still needed to unravel the trophic ecology of predatory fishes.
dc.relation.ispartofjournalEcology of Freshwater Fish
dc.subject.fieldofresearchFisheries Sciences
dc.subject.keywordsScience & Technology
dc.subject.keywordsLife Sciences & Biomedicine
dc.subject.keywordsMarine & Freshwater Biology
dc.titleUncertainties associated with trophic discrimination factor and body size complicate calculation of delta N-15-derived trophic positions in Arapaima sp.
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationJacobi, CM; Villamarin, F; Jardine, TD; Magnusson, WE, Uncertainties associated with trophic discrimination factor and body size complicate calculation of delta N-15-derived trophic positions in Arapaima sp.,Ecology of Freshwater Fish, 2020
gro.description.notepublicThis publication has been entered in Griffith Research Online as an advanced online version.
gro.hasfulltextNo Full Text
gro.griffith.authorJardine, Timothy

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