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Aumento del Proterozoico tardío en la concentración de oxígeno atmosférico inferido de estudios filogenéticos y de
1Max Planck Institute for Marine Microbiology, Bremen, Germany.
Nature
|July 11, 1996
Resumen
La evolución de las bacterias no fotosintéticas y un cambio en los isótopos de sulfuro ocurrió hace 0.64-1.05 mil millones de años. Esto probablemente fue impulsado por el aumento del oxígeno atmosférico, posiblemente desencadenando la evolución animal.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Microbiología Microbiología.
- Paleontología Paleontología.
Sus antecedentes:
- La Era Neoproterozoica (hace 1.05 a 0.64 mil millones de años) fue testigo de cambios ambientales significativos.
- Comprender los impulsores de la evolución microbiana temprana es crucial para descifrar la historia de la Tierra.
Objetivo del estudio:
- Investigar la co-ocurrencia de la evolución microbiana y los cambios geoquímicos.
- Para explorar el impacto del aumento del oxígeno atmosférico en la vida temprana.
Principales métodos:
- Análisis de la composición isotópica en los sulfuros sedimentarios.
- Correlación de los datos geoquímicos con los registros fósiles.
Principales resultados:
- Un cambio significativo en los isótopos de sulfuro sedimentario biogénico ocurrió entre hace 0.64 y 1.05 mil millones de años.
- La evolución de las bacterias no fotosintéticas oxidantes de sulfuro coincidió con este cambio isotópico.
- Estos eventos se alinean con un aumento propuesto en el oxígeno atmosférico (5-18% de los niveles actuales).
Conclusiones:
- El aumento de los niveles de oxígeno atmosférico probablemente impulsó tanto la evolución microbiana como los cambios geoquímicos.
- Este evento de oxigenación puede haber sido un desencadenante crítico para la posterior evolución de los animales.
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