Paper No. 1
Presentation Time: 17:00-18:30
INFERENCES FOR LATE PLEISTOCENE HORSES GENUS EQUUS SP. AT LATE PLEISTOCENE FROM SEVEN MEXICAN LOCALITIES
Using δ13C and δ18O biogeochemical markers found at the dental enamel, it was inferred the diet of 37 individuals of Pleistocene horse from seven Mexican localities, as follows: Cedral, Laguna de las Cruces, and La Presita(San Luis Potosí), Tequixquiac (State of México), Valsequillo (Puebla), Los Glifos (Chiapas), and Loltun (Yucatán). Values for δ13C ranged from – 7.9‰ to 0.9‰ with an average at -3.4‰, while the average value for δ18O was -2.3‰ ranging from -8.1‰ to -2.9‰. Comparisons of the isotopic carbon values were assayed and showed that there were not differences between analyzed individuals (D. F. 36, p<0.706494, F: 0.63; p<0.439386, H: 5.857106); linear regressions assayed between δ13C and altitude, latitude and longitude, respectively, shown that there are not differences in δ13C values with respect to those geographic factors. Based on those results, it can be inferred that this animal in México had a mixed-feeding diet with some individuals which diets were exclusively based in C4 plants to others with mixed feeder C3/C4, but with a large consumption of C3 plants as well, which was independent from the inhabited locality. Such a locality was generally an open vegetation area, with some degree of three covering, all of that inferred from the δ18O values.