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Autoorganización de la materia orgánica disuelta en micropartículas parecidas a las micelas en el agua de los ríos
Martin Kerner1, Heinz Hohenberg, Siegmund Ertl
1University of Hamburg, Institute for Hydrobiology and Fishery Science, D-22765 Hamburg, Zeiseweg 9, Germany. kerner@uni-hamburg.de
Nature
|March 14, 2003
Resumen
La agregación abiótica de carbono orgánico disuelto (DOC) forma micropartículas, evitando el circuito microbiano. Este proceso abiótico contribuye significativamente a la transferencia de carbono en los ecosistemas acuáticos, desafiando los modelos actuales.
Área de la Ciencia:
- Ciencias ambientales Ciencias ambientales.
- Ecología acuática ecología acuática.
- Biogeoquímica La biogeoquímica es la bioquímica.
Sus antecedentes:
- El ciclo microbiano describe la conversión de materia orgánica disuelta (MDO) en materia orgánica particulada por las bacterias en los sistemas acuáticos.
- Este proceso es crucial para la transferencia de energía a niveles tróficos más altos e influye en la productividad acuática.
Objetivo del estudio:
- Para investigar la agregación abiótica del carbono orgánico disuelto (DOC) en micropartículas.
- Para determinar si esta vía abiótica evita el bucle microbiano en la transferencia de carbono.
Principales métodos:
- Incubaciones de laboratorio de agua de río filtrada y estéril.
- Análisis de la agregación del carbono orgánico disuelto (DOC) en micropartículas (0,4-0,8 micrómetros).
- Análisis de isótopos de carbono estable para rastrear las vías de carbono.
Principales resultados:
- Hasta el 25% de carbono orgánico disuelto (DOC) abióticamente agregado en micropartículas.
- La agregación se produjo a través de la difusión de DOC de baja a alta masa molecular.
- La composición de las micropartículas sugiere su idoneidad como alimento para bacteriívoros planctónicos, confirmado por análisis isotópicos.
Conclusiones:
- La formación abiótica de micropartículas proporciona una vía directa para la transferencia de DOC a niveles tróficos más altos, evitando el bucle microbiano.
- La comprensión actual del ciclo del carbono en los sistemas acuáticos puede necesitar revisión para incluir esta vía de agregación abiótica.
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