Intra-tooth stable isotope profiles in warthog canines and third molars: Implications for paleoenvironmental reconstructions

CH4/CO2 Ratios and Carbon Isotope Enrichment Between Diet and Breath in Herbivorous Mammals

“…37 • C), then a near constant value for ε * breath-enamel for most mammal species is expected. The observations of Yang et al (2020) concerning ever-growing and non-ever growing teeth, presumably formed at the same time in the same individual, having different δ 13 C values suggests additional work needs to be done on understanding isotope signals in teeth of different growth and maturation patterns. The value for ε * breath-enamel = 11.6 ± 0.2 is very similar to the 12 value proposed by Krueger and Sullivan (1984) based on isotope considerations in the H 2 O-CO 2 system and assuming complete conversion of diet (as carbohydrates) to CO 2 .…”

High-resolution stable isotope profiles of modern elephant (Loxodonta africana) tusk dentin and tail hair from Kenya: Implications for identifying seasonal variability in climate, ecology, and diet in ancient proboscideans

“…Whether or not Plio-Pliestocene fossil tusks from East Africa or other parts of the world are suitable for stable isotope profiles remains to be tested. If diagenesis precludes the use of Plio-Pliestocene fossil tusks from East Africa, isotope profiles from proboscidean enamel or other large herbivore molar teeth may provide alternative proxies for examining seasonal environmental variability (Reid et al, 2019;Uno et al, 2020;Yang et al, 2020).…”

Late Oligocene Precipitation Seasonality in East Asia Based on δ13C Profiles in Fossil Wood

“…High-resolution isotope analysis on corals (Aggarwal et al, 2004;Su et al, 2010), speleothems (Cheng et al, 2016;Fleitmann et al, 2003;Kathayat et al, 2017), gastropods (Licht et al, 2014), and mammal tooth enamel (Licht et al, 2014) can record intra-to inter-annual paleoclimate patterns. However, coral and speleothem records are only available for the Quaternary Period, and quantitative models for annual isotope variations in shells or teeth are not widely applied in deep-time (though see Passey et al, 2005;Yang et al, 2020). Recent schlerochronological analyses from Paratethys Sea oysters coupled with numerical model simulations have provided some of the first high resolution, seasonal paleoclimate reconstructions from the Eocene of central Asia and support interpretations of strongly seasonal precipitation over the region prior to the Neogene (Bougeois et al, 2014(Bougeois et al, , 2018.…”