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- W2487016018 abstract "Stable isotope ecology has made great strides in quantifying energy transfer through food webs. However, trophic inferences gleaned from field-collected data can be limited when isotopic turnover and isotopic discrimination factors (Δ 13 C or Δ 15 N) are unknown. We quantified isotopic turnover and discrimination factors using an isotopic diet switch in the endangered Colorado pikeminnow (Ptychocheilus lucius). The estimated half-life for δ 13 C was 62 days or a 33% increase in mass and δ 15 N averaged 133 days or a 52% increase in mass. Growth and metabolic processes both contributed to rates of turnover, but metabolic processes had a stronger effect in δ 13 C than in δ 15 N. Lipid-corrected δ 13 C values resulted in discrimination factors of Δ 13 C between 0.67 and 0.82 and Δ 15 N between 2.31 and 2.93, values similar to other fishes. These results suggest sampling fin tissue may be a useful, nonlethal tool for isotopic studies. Fins also demonstrated enrichment in 13 C that was not linked to the diet switch, highlighting the importance of controls in isotopic diet switch studies to verify species- and diet-specific estimates of isotopic turnover rates." @default.
- W2487016018 created "2016-08-23" @default.
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- W2487016018 date "2017-02-01" @default.
- W2487016018 modified "2023-10-16" @default.
- W2487016018 title "Isotopic tissue turnover and discrimination factors following a laboratory diet switch in Colorado pikeminnow (<i>Ptychocheilus lucius</i>)" @default.
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- W2487016018 doi "https://doi.org/10.1139/cjfas-2015-0531" @default.
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