Isotopic discrimination of resource partitioning among ungulates in C3-dominated communities from the Miocene of Florida and California

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The problem of isotopic baseline: Reconstructing the diet and trophic position of fossil animals (2011, background): “…the relative contribution of C3 and C4 plants to diet (Wang et al., 1994; Macfadden and Cerling, 1996), niche separation (MacFadden et al., 2004; Feranec and MacFadden, 2006; Fricke and Pearson, 2008), age of weaning (Rountrey et al., 2007), and trophic structure (Ostrom et al., 1993) in…”
Stable isotopes reveal seasonal competition for resources between late Pleistocene bison (Bison) and horse (Equus) from Rancho La Brea, southern California (2009, background): “Isotope values recovered from fossil tooth enamel have proven useful for understanding ecology in ancient mammals (Quade et al., 1992; Koch et al., 1998; Feranec and MacFadden, 2000, 2006; Bocherens, 2003; Kohn et al., 2005).”
Bonebeds : genesis, analysis, and paleobiological significance (2007, background): “Even when C4 plants are not inferred to be present, isotopic differences have revealed dietary preferences for understory plants versus canopy plants or more closed versus more open microenvironments (Fig 8.8b; Cerling et al., 2004; Feranec and MacFadden, 2006).”