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Comentario sobre "Los efectos complejos de la acidificación del océano en el prominente cianobacterium fijador de N2
David A Hutchins1, Feixue Fu2, Nathan G Walworth2
1Marine and Environmental Biology, Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA. dahutch@usc.edu.
Science (New York, N.Y.)
|September 16, 2017
Resumen
Este estudio refuta la hipótesis de toxicidad del amoníaco o del cobre para las cianobacterias marinas Trichodesmium. Múltiples estudios muestran que los altos niveles de CO2 mejoran, no disminuyen, el crecimiento y la fijación de nitrógeno en Trichodesmium.
Área de la Ciencia:
- Microbiología marina
- Biogeoquímica
- La oceanografía
Sus antecedentes:
- Las cianobacterias marinas Trichodesmium son vitales para la fijación de nitrógeno.
- Estudios anteriores indicaron que el alto contenido de CO2 inhibe el crecimiento de Trichodesmium y la fijación de nitrógeno debido a la toxicidad.
- Hong y otros. La contaminación por amoníaco o cobre propuesta causó estos efectos observados.
Objetivo del estudio:
- Evaluar la hipótesis de toxicidad propuesta por Hong et al.
- Para sintetizar la evidencia de múltiples estudios sobre la respuesta del Trichodesmium a las altas concentraciones de CO2.
- Aclarar el impacto de los niveles elevados de CO2 en la fijación de nitrógeno marino.
Principales métodos:
- Revisión de la literatura y síntesis de los datos experimentales publicados.
- Análisis de los estudios que investigan el tricodesmio en condiciones variables de CO2.
- Comparación de los resultados de los estudios con y sin niveles controlados de contaminantes.
Principales resultados:
- Varios estudios independientes contradicen la hipótesis de toxicidad.
- La evidencia apoya el aumento, no la disminución, del crecimiento y la fijación de nitrógeno en Trichodesmium a niveles elevados de CO2.
- Los experimentos controlados muestran consistentemente respuestas positivas a altos niveles de CO2.
Conclusiones:
- La toxicidad propuesta para el amoníaco o el cobre en el Trichodesmium no está respaldada por la literatura científica más amplia.
- Es probable que los niveles elevados de CO2 aumenten la actividad de este organismo fijador de nitrógeno marino clave.
- Comprender estas respuestas es crucial para predecir la futura biogeoquímica del océano.
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