Item talk:Q236232
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"abstract": "RATIONALE: The ratios of stable nitrogen isotopes (\u03b415N values) in excreta have been used to examine aspects of trophic \nand nutritional ecology across taxa. Nitrogen fractions in feces of herbivores include endogenous (e.g., sloughed \nintestinal cells, unresorbed digestive secretions, and microbial debris) and dietary sources. For animals such as large \nherbivores, that have diets and feces with high concentrations of indigestible \ufb01ber, endogenous 15N may constrain the \nuse of fecal \u03b415N values to estimate dietary \u03b415N values and reconstruct diets.\n\nMETHODS: We compared two techniques (detergent and detergent-free) to isolate fractions of plant \ufb01bers in the forages \nof caribou (Rangifer tarandus) and muskoxen (Ovibos moschatus); estimated the discrimination factors between the \u03b415N \nvalues of fecal \ufb01ber residues and of the diets of captive animals; and used the more effective isotopic tracer of dietary \n\u03b415N values to examine the relationships between the \u03b415N values of fecal residues and diet composition in several \npopulations of wild caribou and muskoxen throughout North America in winter.\n\nRESULTS: The detergent-based approach contaminated the fractions of plant \ufb01bers in forages and feces with 14N, whereas \nthe detergent-free method was a good proxy to estimate \u03b415N values of plant \ufb01bers (r2= 0.92) and provided a better estimate \nof the fecal-\ufb01ber to diet discrimination factor for both species (caribou = 3.6\u2030; muskoxen = 2.8\u2030). In wild populations, the \n\u03b415N values of fecal \ufb01bers re\ufb02ected diet composition in muskoxen (adjusted R2= 0.43) but not caribou (adjusted R2= 0.06). \n\nCONCLUSIONS: Contamination from detergent residues prohibited the use of detergent extraction in isolating forage 15N \nfrom endogenous 15N in the feces of herbivores. Although \u03b415N values in fecal \ufb01bers can be used to track dietary \u03b415N values \nin wild herbivores, discrimination between fecal extracts and diet may vary with the contribution of endogenous nitrogen \n(N), and, therefore, residual endogenous 15N in feces may limit dietary reconstructions from fecal \u03b415N values for some large \nherbivores.",
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