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La desnitrificación como el proceso dominante de pérdida de nitrógeno en el Mar Arábigo
B B Ward1, A H Devol, J J Rich
1Department of Geosciences, Princeton University, Princeton, New Jersey 08544, USA. bbw@princeton.edu
Nature
|September 4, 2009
Resumen
La desnitrificación, no el anammox, domina la pérdida de nitrógeno en el Mar Arábigo.
Área de la Ciencia:
- Ecología microbiana marina ecología microbiana marina.
- Los ciclos biogeoquímicos son ciclos biogeoquímicos.
- Oceanografía La oceanografía es la oceanografía.
Sus antecedentes:
- La producción primaria del océano a menudo está limitada por el nitrógeno fijo.
- La pérdida de nitrógeno se produce a través de la desnitrificación y la oxidación anaeróbica del amoníaco (anammox).
- Las zonas mínimas de oxígeno (ZMO) son lugares clave para la pérdida de nitrógeno oceánico.
Objetivo del estudio:
- Cuantificar las tasas de desnitrificación y anammox en las ZMO.
- Determinar la vía dominante de pérdida de nitrógeno en la ZMO del Mar Arábigo.
- Compare el ciclo del nitrógeno en las ZMO del Mar Arábigo y del Pacífico Sur Tropical Oriental.
Principales métodos:
- Mediciones in situ de las tasas de desnitrificación y anammox.
- Cuantificación de la abundancia de las bacterias desnitrificantes y anammox.
- El uso de dos métodos de incubación de isótopos independientes.
Principales resultados:
- La desnitrificación representó el 87-99% de la producción de N2 en la ZMO del Mar Arábigo.
- Anammox dominó la pérdida de N (((2) en la OMZ del Pacífico Sur Tropical Oriental.
- Las bacterias desnitrificantes superaron en número a las bacterias anammox en ambas OMZ.
Conclusiones:
- La desnitrificación es el principal motor de la pérdida de nitrógeno en la OMZ del Mar Arábigo.
- La importancia relativa de la desnitrificación y el anammox varía geográficamente.
- La desnitrificación juega un papel globalmente significativo en los presupuestos de nitrógeno oceánico.
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