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Fotosíntesis bacteriana en aguas superficiales del océano abierto
Z S Kolber1, C L Van Dover, R A Niederman
1Environmental Biophysics and Molecular Ecology Program, Institute of Marine and Coastal Sciences, Rutgers University, New Brunswick, New Jersey 08901-8521, USA.
Nature
|September 23, 2000
Resumen
La fotosíntesis bacteriana aeróbica está muy extendida en los océanos tropicales y templados, lo que desafía las suposiciones anteriores. Estas bacterias contribuyen significativamente al transporte total de electrones fotosintéticos en aguas superficiales.
Área de la Ciencia:
- Microbiología marina microbiología marina.
- La investigación de la fotosíntesis en la investigación de la fotosíntesis.
- Biogeoquímica La biogeoquímica es la bioquímica.
Sus antecedentes:
- La fotosíntesis oxigenada por las cianobacterias históricamente limitó la fotosíntesis anoxigenada a las zonas anóxicas.
- El descubrimiento de bacterias fotosintéticas tolerantes al oxígeno alteró esta comprensión.
- La distribución global y la importancia de la fotosíntesis bacteriana aeróbica siguen siendo en gran medida desconocidas.
Objetivo del estudio:
- Investigar la distribución y prevalencia de la fotosíntesis bacteriana aeróbica en los océanos globales.
- Para evaluar la competencia fotosintética de estas bacterias.
- Para determinar su contribución a la fotosíntesis marina en general.
Principales métodos:
- Mediciones biofísicas en aguas tropicales del Pacífico y aguas templadas del Atlántico.
- Cuantificación de las tasas de transporte de electrones fotosintéticos.
- Análisis comparativo con fotoautótrofos oxigenados.
Principales resultados:
- La fotosíntesis bacteriana aeróbica está muy extendida en las aguas superficiales tropicales del Pacífico oriental y templadas del noroeste del Atlántico.
- Estas bacterias representan el 2-5% del transporte total de electrones fotosintéticos en las regiones oceánicas superiores estudiadas.
- Proporciona la primera evidencia biofísica para la fotosíntesis bacteriana aeróbica generalizada.
Conclusiones:
- La fotosíntesis bacteriana aeróbica es un proceso significativo en los ecosistemas marinos contemporáneos.
- Los hallazgos requieren una reevaluación de los modelos mundiales de producción marina primaria.
- Las bacterias fotosintéticas marinas juegan un papel más diverso de lo que se reconocía anteriormente.
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