Stable isotope discrimination factors of omnivorous fishes: influence of tissue type, temperature, diet composition and formulated feeds.

Britton, J.R. and Busst, G.M., 2017. Stable isotope discrimination factors of omnivorous fishes: influence of tissue type, temperature, diet composition and formulated feeds. Hydrobiologia. (In Press)

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DOI: 10.1007/s10750-017-3423-9

Abstract

Application of stable isotope data to trophic studies requires understanding of factors influencing the isotopic discrimination factor (Δ) between consumers and their prey resources. This is missing for many omnivorous species, despite their diet and environment potentially impacting Δ. The effects of temperature, diet (including formulated feeds) and tissue type on Δ13C and Δ15N were thus tested experimentally. A temperature experiment exposed three species to identical diets at 18 and 23°C, whereas a diet experiment exposed one species to four diets at 18°C. At 23°C, C:N ratios, Δ13C and Δ15N were generally elevated versus 18°C. After lipid correction, tissue/species-specific differences at 23°C in Δ13C and Δ15N were up to 0.73 and 0.54‰ higher, respectively. Across the four diets, there were also significant differences in Δ13C and Δ15N between a natural diet and diets based on formulated feeds. Δ13C and Δ15N of muscle were 1.51 to 2.76‰ and 3.13 to 5.44‰, respectively. Highest Δ for both isotopes was from a formulated feed based on plant material that resulted in lower dietary protein content and quality. Thus, diet and environment fundamentally affected the isotopic discrimination factors and these factors require consideration within trophic studies based on stable isotopes.

Item Type:Article
ISSN:0018-8158
Uncontrolled Keywords:Cyprinidae; Stable isotope fractionation; Stable isotope analysis; Mixing models
Group:Faculty of Science & Technology
ID Code:29970
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:13 Nov 2017 15:25
Last Modified:13 Nov 2017 15:25

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