An experimental study of nitrogen flux in llamas: is 14N preferentially excreted?

By M. Sponheimer, T. Robinson, B. Roeder, B. Passey, L. Ayliffe, T. Cerling, M. Dearing, J. Ehleringer. 2003

126 citations recorded by the source corpus.

Subfields: Anthropology, Ecology, Paleontology

View Paper: https://www.semanticscholar.org/paper/a548ad832a43a6eca475242a0e98c55ea96ce529

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Citations in the corpus

Diet in the Iron Age cemetery population at Wetwang Slack, East Yorkshire, UK : carbon and nitrogen stable isotope evidence (2006, unknown): “however, since experimental studies suggest that different species may exhibit varying levels of (15)N enrichment over their diets [47, 48].”
Isotopic ecology ten years after a call for more laboratory experiments (2009, background): “Unfortunately, Sponheimer et al. (2003) did not measure the isotopic composition of the llama’s tissues.”
Influence of seabird guano and camelid dung fertilization on the nitrogen isotopic composition of field-grown maize (Zea mays) (2012, background): “(B) Urinary-N d(15)N tends to be lower in comparison to tissue-N (Knobbe et al., 2006; Sponheimer et al., 2003; Steele and Daniel, 1978; Sutoh et al., 1987).”
Effects of food quality, starvation and life stage on stable isotope fractionation in Collembola (2005, background): “Second, if low but sufficient amounts of proteins are incorporated the amino acids are used entirely for tissue formation, and animals therefore do not fractionate N (Sponheimer et al., 2003; Ostrom et al., 1997).”
Stable Isotopes of Carbon and Nitrogen as Tracers for Paleo-Diet Reconstruction (2012, background): “They attributed this to two effects: (a) loss of ammonia from the soil in hot, arid conditions; and (b) increased storage of urea in urine used by animals (and humans) which experience water shortage in order to decrease loss of water as urine (see Sponheimer et al. 2003 ).”
Growth versus metabolic tissue replacement in mouse tissues determined by stable carbon and nitrogen isotope analysis (2005, background): “In addition, different tissues may exhibit different diet–tissue discrimination factors (Sponheimer et al. 2003).”
Ten years of experimental animal isotopic ecology (2009, unknown): “However, a positive Δ15N demands that excreta are depleted in 15N relative to the animal’s body – which was not measured by Sponheimer et al. (2003), and in all cases measured this seems to be the case (Tsahar et al. 2007).”