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El hábitat y la naturaleza de la vida temprana
1Department of Geology, University of London, Egham, UK.
Nature
|March 10, 2001
Resumen
La vida temprana en la Tierra probablemente sobrevivió a eventos de calor extremo a través de hipertermófilos, posiblemente originados cerca de respiraderos hidrotermales. La fotosíntesis más tarde permitió que la vida se diversificara y se extendiera globalmente, dando forma a la moderna biosfera.
Área de la Ciencia:
- Astrobiología Astrobiología.
- Geología Geología Geología.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La historia temprana de la Tierra (más de 4.500 millones de años) estuvo marcada por un intenso bombardeo de asteroides.
- Los eventos de impacto pueden haber esterilizado repetidamente el planeta y los océanos sobrecalentados por encima de 100 ° C.
- La vida en la Tierra surgió antes de hace 3.800 millones de años, potencialmente perdurando los "cuellos de botella del océano caliente".
Objetivo del estudio:
- Explorar las condiciones bajo las cuales la vida primitiva sobrevivió en la Tierra.
- Investigar los posibles orígenes y adaptaciones de las primeras formas de vida.
- Comprender la evolución de las vías bioquímicas clave en la biosfera temprana de la Tierra.
Principales métodos:
- Análisis de la evidencia geológica y paleontológica para la vida temprana.
- Modelado de las condiciones ambientales de la Tierra temprana, incluyendo eventos de impacto y temperaturas del océano.
- Análisis comparativo de la biología hipertermófila y los primeros procesos bioquímicos.
Principales resultados:
- La vida temprana probablemente consistió en hipertermófilos (que prosperaron a 80-110 ° C).
- La vida puede haberse originado cerca de fuentes hidrotermales o haber sido transferida desde Marte.
- Las vías bioquímicas esenciales para la biosfera moderna evolucionaron hace 3.500 millones de años.
Conclusiones:
- Los hipertermófilos fueron cruciales para la supervivencia de la vida temprana a través de condiciones ambientales extremas.
- La evolución de la fotosíntesis permitió que la vida hiciera la transición de los entornos hidrotermales.
- La evolución temprana de la vida sentó las bases para la biosfera global observada hoy en día.
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