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  • Uncertainties associated with trophic discrimination factor and body size complicate calculation of delta N-15-derived trophic positions in Arapaima sp.

    Author(s)
    Jacobi, Cristina Mariana
    Villamarin, Francisco
    Jardine, Timothy D
    Magnusson, William Ernest
    Griffith University Author(s)
    Jardine, Timothy
    Year published
    2020
    Metadata
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    Abstract
    Stable 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 ...
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    Stable 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.
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    Journal Title
    Ecology of Freshwater Fish
    DOI
    https://doi.org/10.1111/eff.12553
    Note
    This publication has been entered in Griffith Research Online as an advanced online version.
    Subject
    Ecology
    Zoology
    Fisheries sciences
    Science & Technology
    Life Sciences & Biomedicine
    Fisheries
    Marine & Freshwater Biology
    Amazon
    Publication URI
    http://hdl.handle.net/10072/396997
    Collection
    • Journal articles

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