Stable isotope discrimination factors of omnivorous fishes: influence of tissue type, temperature, diet composition and formulated feeds
Authors: Britton, J.R. and Busst, G.M.A.
Journal: Hydrobiologia
Volume: 808
Issue: 1
Pages: 219-234
eISSN: 1573-5117
ISSN: 0018-8158
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.
https://eprints.bournemouth.ac.uk/29970/
Source: Scopus
Stable isotope discrimination factors of omnivorous fishes: influence of tissue type, temperature, diet composition and formulated feeds
Authors: Britton, J.R. and Busst, G.M.A.
Journal: HYDROBIOLOGIA
Volume: 808
Issue: 1
Pages: 219-234
eISSN: 1573-5117
ISSN: 0018-8158
DOI: 10.1007/s10750-017-3423-9
https://eprints.bournemouth.ac.uk/29970/
Source: Web of Science (Lite)
Stable isotope discrimination factors of omnivorous fishes: influence of tissue type, temperature, diet composition and formulated feeds
Authors: Britton, J. and Busst, G.M.
Journal: Hydrobiologia
Publisher: Kluwer Academic Publishers
ISSN: 0018-8158
https://eprints.bournemouth.ac.uk/29970/
Source: Manual
Stable isotope discrimination factors of omnivorous fishes: influence of tissue type, temperature, diet composition and formulated feeds
Authors: Britton, J.R. and Busst, G.M.
Journal: Hydrobiologia
Volume: 808
Issue: 1
Pages: 219-234
ISSN: 0018-8158
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.
https://eprints.bournemouth.ac.uk/29970/
Source: BURO EPrints