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El entorno geológico, isotópico, botánico, invertebrado y de vertebrados inferiores de Ardipithecus ramidus
Giday WoldeGabriel1, Stanley H Ambrose, Doris Barboni
1Earth Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. wgiday@lanl.gov
Science (New York, N.Y.)
|October 8, 2009
Resumen
Los fósiles de Ardipithecus ramidus, encontrados en Etiopía, indican que una antigua especie de homínidos habitaba bosques húmedos hace 4,4 millones de años. Los datos geológicos y paleontológicos revelan sus preferencias ambientales y de hábitat.
Área de la Ciencia:
- La paleoantropología es la paleoantropología.
- Geocronología Geocronología.
- Paleoecología Paleoecología.
Sus antecedentes:
- Los sedimentos que contienen Ardipithecus ramidus datan de hace 4,4 millones de años.
- La unidad portadora de homínidos se encuentra en la grieta occidental de Afar, Etiopía.
- Esta unidad está situada entre dos tufos volcánicos con edades argón-argon similares (40Ar/39Ar).
Objetivo del estudio:
- Para reconstruir el paleoambiente de Ardipithecus ramidus.
- Para determinar el hábitat ocupado por los primeros homínidos.
Principales métodos:
- Análisis geológico de depósitos sedimentarios.
- Examen paleontológico de fósiles florales, invertebrados y vertebrados.
- Análisis tafonómico de las asociaciones fósiles.
- Análisis de fitolitos. análisis de fitolitos.
- Análisis de isótopos estables (oxígeno y carbono) de carbonatos pedogénicos.
Principales resultados:
- La evidencia sugiere que Ardipithecus ramidus habitó un biótopo boscoso.
- El hábitat cubría las tres cuartas partes occidentales del paleotranstecto estudiado.
- Los fitolitos y los isótopos estables indican bosques húmedos y fríos con un sustrato de hierba.
Conclusiones:
- Ardipithecus ramidus vivía en un complejo entorno boscoso.
- Los hallazgos proporcionan información sobre nichos ecológicos y adaptaciones de los primeros homínidos.
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