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Oxidación del metano marino dependiente del manganeso y el hierro
Emily J Beal1, Christopher H House, Victoria J Orphan
1Department of Geosciences and Penn State Astrobiology Research Center, Pennsylvania State University, University Park, PA 16802, USA. ejbeal@gmail.com
Science (New York, N.Y.)
|July 11, 2009
Resumen
La oxidación anaeróbica del metano (AOM) puede usar hierro y manganeso, no solo sulfato. Este hallazgo amplía nuestra comprensión del ciclo del metano y su papel en la regulación climática de la Tierra.
Área de la Ciencia:
- Microbiología ambiental microbiología ambiental.
- Los ciclos biogeoquímicos son ciclos biogeoquímicos.
- Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- Los metanótrofos anaeróbicos son cruciales para regular el clima de la Tierra.
- La oxidación anaeróbica del metano (AOM) se considera típicamente dependiente del sulfato.
- Otros aceptores de electrones son energéticamente más favorables para el AOM que el sulfato.
Objetivo del estudio:
- Investigar aceptores de electrones alternativos para la oxidación anaeróbica del metano en entornos marinos.
- Para determinar si el manganeso y el hierro pueden soportar AOM en sedimentos marinos.
Principales métodos:
- Se ha recolectado sedimento marino que se filtra metano de la cuenca del río Eel, California.
- Comunidades microbianas enriquecidas capaces de la oxidación anaeróbica del metano.
- Se evaluó la utilización de manganeso (birnesita) y hierro (ferrihidrita) como aceptores de electrones para la oxidación del metano.
Principales resultados:
- Los microorganismos de los sedimentos marinos que filtran metano pueden oxidar el metano utilizando manganeso y hierro.
- Esto demuestra que la AOM marina está acoplada a una gama más amplia de oxidantes de lo que se reconocía anteriormente.
- El manganeso y el hierro son suministrados a los océanos por los ríos, lo que sugiere una potencial importancia global.
Conclusiones:
- La oxidación anaeróbica marina del metano no se limita al sulfato como aceptor de electrones.
- Los AOM dependientes del manganeso y el hierro tienen el potencial de ser procesos globalmente importantes.
- Esto expande las vías microbianas conocidas que influyen en el ciclo del metano y la regulación del clima.
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