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Respuesta al comentario sobre "La dilución limita la utilización de carbono orgánico disuelto en las profundidades

Jesús M Arrieta¹, Eva Mayol², Roberta L Hansman³

¹Red Sea Research Center, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia. Department of Global Change Research, Institut Mediterrani d'Estudis Avançats (IMEDEA), Consejo Superior de Investigaciones Científicas (CSIC)/Universidad de las Islas Baleares (UIB), 07190 Esporles, Spain. jesus.arrieta@kaust.edu.sa.

Science (New York, N.Y.)

|December 19, 2015

Resumen

La dilución limita el uso de carbono orgánico disuelto (DOC) en las profundidades del océano. Este hallazgo se mantiene incluso cuando se consideran nuevas definiciones de DOC recalcitrante, que apoyan la hipótesis de dilución.

Área de la Ciencia:

Ecología microbiana marina
Ciclos biogeoquímicos

Sus antecedentes:

El carbono orgánico disuelto (DOC) es un componente importante del ciclo del carbono del océano.
Comprender la utilización de COD es crucial para el secuestro de carbono en las profundidades del océano.
Los estudios anteriores a menudo asumen que el DOC lábil se consume rápidamente, pasando por alto otros factores.

Objetivo del estudio:

Para abordar las críticas a la hipótesis de dilución con respecto a la utilización de DOC en las profundidades del océano.
Aclarar la relación entre la labilidad del COD y las tasas de utilización.
Reevaluar las observaciones experimentales a la luz de las recientes definiciones de recalcitrancia de la DOC.

Principales métodos:

Manipulación experimental de las comunidades microbianas y las concentraciones de COD.
Experimentos de incubación que simulan las condiciones del océano profundo.
Análisis de las tasas de utilización de COD bajo diferentes factores de dilución.

Principales resultados:

La evidencia experimental apoya que la dilución limita la utilización de DOC en entornos oceánicos profundos.
Se desmiente la idea errónea de que la labilidad garantiza un consumo rápido y completo de DOC.
La hipótesis de dilución sigue siendo la explicación más robusta para los resultados experimentales observados.

Conclusiones:

El efecto de dilución influye significativamente en la biodisponibilidad de DOC en aguas profundas.
Las definiciones de DOC recalcitrante no niegan la importancia de la dilución para limitar la utilización.
Las investigaciones adicionales deben incorporar los efectos de dilución al evaluar el ciclo del carbono en las profundidades oceánicas.

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