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Unraveling the Unseen Players in the Ocean - A Field Guide to Water Chemistry and Marine Microbiology

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Comentario sobre "La dilución limita la utilización de carbono orgánico disuelto en las profundidades del océano"

Nianzhi Jiao¹, Louis Legendre², Carol Robinson³

¹State Key Laboratory of Marine Environmental Sciences, Xiamen University, China. Institute of Marine Microbes and Ecospheres, Xiamen University, China. jiao@xmu.edu.cn legendre@obs-vlfr.fr carol.robinson@uea.ac.uk helmuth.thomas@posteo.org.

Science (New York, N.Y.)

|December 19, 2015

Resumen

Las bajas concentraciones de carbono orgánico disuelto (DOC) no impiden que los microbios del océano profundo lo consuman. La dilución no es un mecanismo primario para el almacenamiento a largo plazo de DOC, lo que desafía los hallazgos anteriores.

Área de la Ciencia:

Química marina
Oceanografía microbiana
Ciclos biogeoquímicos

Sus antecedentes:

El carbono orgánico disuelto (DOC) es un componente importante del ciclo del carbono oceánico.
El destino del DOC en las profundidades del océano es crítico para comprender el secuestro de carbono a largo plazo.
Investigaciones anteriores sugirieron que la dilución mediante bajas concentraciones de COD labiles limita el consumo microbiano y ayuda al almacenamiento de carbono.

Objetivo del estudio:

Reevaluar la hipótesis de que las bajas concentraciones de carbono orgánico disuelto (DOC) limitan el consumo de procariotas en el océano profundo.
Evaluar el papel de la dilución frente a la recalcitrancia en el almacenamiento de DOC a largo plazo.
Para analizar críticamente los datos presentados por Arrieta et al. En el año 2015.

Principales métodos:

Reanálisis de los datos existentes sobre las concentraciones de COD y la actividad microbiana en las profundidades oceánicas.
Análisis comparativo de los mecanismos de dilución propuestos con respecto a las tasas de consumo microbiano.
Evaluación de la contribución de la recalcitrancia DOC al almacenamiento a largo plazo.

Principales resultados:

Los datos presentados por Arrieta et al. no apoyan su conclusión de que las bajas concentraciones de COD limitan el consumo de procariotas.
El consumo microbiano de DOC no está excluido por las bajas concentraciones en las profundidades oceánicas.
La recalcitrancia, más que la dilución, sigue siendo el factor dominante para el almacenamiento a largo plazo de DOC.

Conclusiones:

El mecanismo de dilución propuesto para el almacenamiento de DOC no está respaldado por la evidencia disponible.
El consumo de procariotas juega un papel importante en el destino del DOC labile, incluso a bajas concentraciones.
La comprensión del ciclo DOC requiere centrarse en el procesamiento microbiano y la estabilidad molecular inherente (recalcitrancia).

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