Estudios Geológicos, Vol 67, No 2 (2011)

Extinción de Equidae y Proboscidea en América del Sur. Un test usando datos de isótopos de carbono


https://doi.org/10.3989/egeol.40505.193

J. L. Prado
INCUAPA, Universidad Nacional del Centro, Argentina

M. T. Alberdi
Museo Nacional de Ciencias Naturales, CSIC, España

B. Sánchez
Museo Nacional de Ciencias Naturales, CSIC, España

G. Gómez
INCUAPA, Universidad Nacional del Centro, Argentina

Resumen


Los isótopos del carbono preservados en 166 muestras de dientes y huesos fósiles son un dato clave para entender la ecología de los de caballos y gonfoterios durante el Plio-Pleistoceno en América del Sur. Para analizar los cambios en las reconstrucciones de la dieta durante este lapso temporal hemos dividido las muestras en 19 grupos, teniendo en cuenta la sistemática y la cronología de cada localidad. En este estudio, las dietas de ambos grupos son evaluadas para probar las hipótesis sobre su extinción. El alto fraccionamiento en el uso de los recursos entre los herbívoros que asume la hipótesis del desequilibrio co-evolutivo es sustentada por los datos isotópicos de los caballos del Pleistoceno tardío. Hippidion y Equus tenían una dieta muy diferente. En contraste, las especies de gonfoterios de finales del Pleistoceno parecen tener una dieta menos especializada con una combinación de plantas C3 y C4, que está en consonancia con los supuestos de la hipótesis del mosaico de nutrientes, pero no admite los supuestos de la hipótesis de desequilibrio Co-evolutivo.

Palabras clave


Extinciones del Pleistoceno tardío; América del Sur; Proboscidea; Perissodactyla; isótopos estables

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Referencias


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