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The application of an oxygen isotope aridity index to terrestrial paleoenvironmental reconstructions in Pleistocene North America

Published online by Cambridge University Press:  07 August 2013

Lindsey T. Yann ,
Larisa R. G. DeSantis ,
Ryan J. Haupt ,
Jennifer L. Romer ,
Sarah E. Corapi  and
David J. Ettenson
Lindsey T. Yann
Affiliation:
Department of Earth and Environmental Sciences, Vanderbilt University, PMB 351805, 2301 Vanderbilt Place, Nashville, Tennessee 37235-1085, U.S.A E-mail: lindsey.t.yann@vanderbilt.edu
Larisa R. G. DeSantis*
Affiliation:
Department of Earth and Environmental Sciences, Vanderbilt University, PMB 351805, 2301 Vanderbilt Place, Nashville, Tennessee 37235-1085, U.S.A E-mail: larisa.desantis@vanderbilt.edu
Ryan J. Haupt
Affiliation:
Department of Earth and Environmental Sciences, Vanderbilt University, PMB 351805, 2301 Vanderbilt Place, Nashville, Tennessee 37235-1085, U.S.A
Jennifer L. Romer
Affiliation:
Department of Earth and Environmental Sciences, Vanderbilt University, PMB 351805, 2301 Vanderbilt Place, Nashville, Tennessee 37235-1085, U.S.A
Sarah E. Corapi
Affiliation:
Department of Earth and Environmental Sciences, Vanderbilt University, PMB 351805, 2301 Vanderbilt Place, Nashville, Tennessee 37235-1085, U.S.A
David J. Ettenson
Affiliation:
Department of Earth and Environmental Sciences, Vanderbilt University, PMB 351805, 2301 Vanderbilt Place, Nashville, Tennessee 37235-1085, U.S.A
*
∗Corresponding author.
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Abstract

Geochemical tools, including the analysis of stable isotopes from fossil mammals, are often used to infer regional climatic and environmental differences. We have further developed an oxygen isotope aridity index and used oxygen (δ18O) isotope values and carbon (δ13C) isotope values to assess regional climatic differences between the southeastern and southwestern United States during the Pleistocene. Using data collected from previously published studies, we assigned taxa to evaporation-sensitivity categories by quantifying the frequency and magnitude of aridity index values (i.e., an average taxon δ18O value minus a site specific proboscidean δ18O value). Antilocapridae, Camelidae, Equidae, and Cervidae were identified as evaporation-sensitive families, meaning that a majority of their water comes from the food they eat, thus indicating that they are more likely to capture changing climatic conditions. Bovidae, Tayassuidae, and Tapiridae were identified as less sensitive families, possibly because of increased or more variable drinking behavior. While it is difficult to tease out individual influences on δ18O values in tooth enamel, the use of an aridity index will provide a more in-depth look at relative aridity in the fossil record. Greater aridity index values in the Southwest suggest a drier climate than in the Southeast during the Pleistocene, and δ13C values suggest that diet does not determine evaporation sensitivity. The combination of more-positive δ13C values and the lack of forest indicator taxa in the Southwest suggest that landscapes were more open than in the Southeast. Inferred higher aridity in the Southwest may indicate that aridity or seasonal aridity/precipitation, not temperature or pCO2, was a greater driver of C4 abundance during the Pleistocene. Collectively, these data suggest that regional climatic and environmental interpretations can be improved by using an aridity index and a more detailed understanding of mammalian paleobiology.

Type
Articles
Information
Paleobiology , Volume 39 , Issue 4 , Fall 2013 , pp. 576 - 590
Copyright
Copyright © The Paleontological Society 

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