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Los procariotas del fondo submarino profundo se estimulan en las interfaces durante el tiempo geológico
R John Parkes1, Gordon Webster, Barry A Cragg
1School of Earth, Ocean and Planetary Sciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3YE, UK. j.parkes@earth.cf.ac.uk
Nature
|July 22, 2005
Resumen
En las profundidades del océano, en las profundidades del océano.
Área de la Ciencia:
- Microbiología marina microbiología marina.
- La geoquímica es la geoquímica.
- Investigación de la biosfera profunda en la investigación de la biosfera profunda.
Sus antecedentes:
- La biosfera del fondo submarino representa el hábitat procariótico más grande de la Tierra.
- Los procariotas en este entorno exhiben tasas metabólicas excepcionalmente bajas.
- Comprender la actividad procariótica profunda es crucial para comprender los ciclos biogeoquímicos globales.
Objetivo del estudio:
- Investigar la actividad procariótica y la biodiversidad en ambientes profundos del fondo submarino.
- Identificar los factores que estimulan los procesos procarióticos en las interfaces geoquímicas y sedimentarias.
- Para evaluar la actividad a largo plazo de los procariotas sedimentarios profundos.
Principales métodos:
- Muestreo y análisis de los ambientes del fondo submarino en el margen del Océano Pacífico y sitios de océano abierto.
- Cuantificación del número de procariotas y las tasas de actividad en varias profundidades.
- Análisis del ADN de alta masa molecular para evaluar la viabilidad de los procariotas y la biodiversidad.
- Correlación de los cambios de la comunidad procariota con los datos geoquímicos y sedimentarios.
Principales resultados:
- Se observó una estimulación subterránea profunda de los procesos procarióticos tanto en los sitios marginales como en los de océano abierto.
- En el sitio del margen, se observó un aumento de 13 veces en el número de procariotas y altas tasas de actividad a 90 m de profundidad.
- Los cambios en la biodiversidad se combinaron con la geoquímica, con un cambio comunitario distinto en la interfaz de 90 m.
- En el océano abierto, el aumento del número de procariotas y la actividad se correlacionaron con antiguos sedimentos ricos en diatomeas.
- Los procariotas sedimentarios profundos demostraron una alta actividad y una diversidad cambiante en escalas de tiempo geológicas.
Conclusiones:
- Los procariotas sedimentarios profundos pueden exhibir una actividad metabólica significativa.
- La diversidad de procariotas en el subsuelo marino es dinámica e influenciada por las interfaces geoquímicas y sedimentarias.
- La vida procariota persiste y permanece activa en ambientes profundos del fondo submarino durante el tiempo geológico.
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