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• W2121173485 abstract "Abstract Metabolic turnover rates ( m ) of δ 15 N and δ 13 C were assessed in different tissues of newly hatched captive‐raised corn snakes ( Elaphe guttata guttata ) fed maintenance diets consisting of earthworms ( Eisenia foetida ) that varied substantially in δ 15 N (by 644‰) and δ 13 C (by 5.0‰). Three treatments were used during this 144 day experiment that consisted of the same diet throughout ( control ), shifting from a depleted to an enriched stable isotope signature diet ( uptake ), and shifting from an enriched to depleted stable isotope signature diet ( elimination ). Values of δ 13 C in the liver, blood, and muscle of the control snakes reached equilibrium with and were, respectively, 1.73, 2.25 and 2.29 greater than in their diet, this increase is called an isotopic discrimination factor (Δ δ 13 C = δ 13 C snake − δ 13 C food ). Values of δ 15 N in snake tissues did not achieve equilibrium with the diets in any of the exposures and thus Δ 15 N could not be estimated. Values of metabolic turnover rates ( m ) for δ 13 C and δ 15 N were greater in liver than in muscle and blood, which were similar, and relative results remained the same if the fraction of 15 N and 13 C were modeled. Although caution is warranted because equilibrium values of stable isotopes in the snakes were not achieved, values of m were greater for δ 13 C than δ 15 N, resulting in shorter times to dietary equilibrium for δ 13 C upon a diet shift, and for both stable isotopes in all tissues, greater during an elimination than in an uptake shift in diet stable isotope signature. Multiple explanations for the observed differences between uptake and elimination shifts raise new questions about the relationship between animal and diet stable isotope concentrations. Based on this study, interpretation of feeding ecology using stable isotopes is highly dependent on the kind of stable isotope, tissue, direction of diet switch ( uptake versus elimination ), and the growth rate of the animal. Copyright © 2009 John Wiley & Sons, Ltd." @default.
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• W2121173485 date "2008-12-16" @default.
• W2121173485 modified "2023-10-15" @default.
• W2121173485 title "Metabolic turnover rates of carbon and nitrogen stable isotopes in captive juvenile snakes" @default.
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• W2121173485 doi "https://doi.org/10.1002/rcm.3880" @default.
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