title: Modeling the dynamics of stable isotope tissue-diet enrichment.
abstract: Reconstructions of dietary composition and trophic level from stable isotope measurements of animal tissue rely on predictable offsets of stable isotope ratios from diet to tissue. Physiological processes associated with metabolism shape tissue stable isotope ratios, and as such the spacing between stable isotope ratios of diet and tissue may be influenced by processes such as growth, nutritional stress, and disease. Here, we develop a model of incorporation stable isotopes in diet to tissues by coupling stable isotope dynamics to a model of macronutrient energy metabolism. We use the model to explore the effect of changes in dietary intake, both composition and amount, and in energy expenditure, on body mass and carbon and nitrogen stable isotope ratios of tissue.
authors.affiliation: University of Idaho, Department of Mathematics, Moscow, D 83844, USA. Electronic address: cremien@uidaho.edu.
authors.forename: Christopher H
authors.initials: CH
authors.lastname: Remien
mesh_terms: D000818:Animals; D002247:Carbon Isotopes; D004032:Diet / Q000662:veterinary*; D004734:Energy Metabolism; D007553:Isotope Labeling; D008954:Models, Biological; D009587:Nitrogen Isotopes; D009928:Organ Specificity; D015430:Weight Gain / Q000502:physiology; D015431:Weight Loss / Q000502:physiology
chemical_list: D002247:Carbon Isotopes; D009587:Nitrogen Isotopes
keywords: Discrimination; Fractionation; Metabolism; Stable isotope ratio