Kangaroo metabolism does not cause the relationship between bone collagen δ15N and water availability

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Stable isotopes evaluate exploitation of anthropogenic foods by the endangered San Joaquin kit fox (Vulpes macrotis mutica) (2010, background): “…and animals inhabiting semiarid environments typically have higher d15N values (Amundson et al. 2003; Austin and Vitousek 1998; Handley et al. 1999; Murphy and Bowman 2006) than many commercially produced meat products consumed by humans in the United States, which are characterized by low and…”
Small scale camelid husbandry on the north coast of Peru (Virú Valley): Insight from stable isotope analysis (2014, background): “…however, a much clearer link between plant (and presumably soil) nitrogen isotopic compositions and rainfall has been found (Hartman, 2011; Murphy and Bowman, 2006), suggesting that the 15N-enriched herbivore tissues that have been observed are largely, or wholly, driven by isotopic…”