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Plancton bacteriano: un sumidero de carbono en una comunidad costera de plancton marino
Science (New York, N.Y.)
|May 16, 1986
Resumen
El bacterioplancton marino, crucial en el bucle microbiano, puede no ser una fuente de alimento significativa para los organismos más grandes. En cambio, actúan principalmente como regeneradores de nutrientes en las redes alimentarias del océano.
Área de la Ciencia:
- Ecología microbiana marina ecología microbiana marina.
- Oceanografía La oceanografía es la oceanografía.
- Los ciclos biogeoquímicos son ciclos biogeoquímicos.
Sus antecedentes:
- El bacterioplancton marino contribuye significativamente a la producción primaria en las aguas superficiales.
- Se supone que son un eslabón clave en el "circuito microbiano", complementando el fitoplancton como alimento para los herbívoros.
Objetivo del estudio:
- Para probar la hipótesis del bucle microbiano utilizando el bacterioplancton marino.
- Para determinar el destino del bacterioplancton marcado con carbono-14 en una columna de agua cerrada.
Principales métodos:
- Utilizó una columna de agua cerrada de 300 metros cúbicos.
- Se rastreó el plancton bacteriano marcado con carbono-14 y sus productos derivados durante 50 días.
- Compuestos etiquetados fraccionados basados en el tamaño (partículas < 1 micrómetro).
Principales resultados:
- Sólo el 2% de la etiqueta de carbono-14 inicial se encontró en organismos más grandes después de 13 días.
- Aproximadamente el 20% de la etiqueta permaneció en la fracción de partículas a los 13 días.
- La mayoría de las etiquetas fueron respiradas como dióxido de carbono o regeneradas en carbono orgánico disuelto, lo que indica un rápido ciclo dentro de la comunidad microbiana.
Conclusiones:
- La producción secundaria por organismos de menos de 1 micrómetro puede no ser una fuente importante de alimentos en las cadenas alimenticias marinas.
- El bacterioplancton puede funcionar como un sumidero de carbono en las redes alimenticias planctónicas.
- El bacterioplancton sirve principalmente como agentes de regeneración de nutrientes en lugar de fuentes directas de alimentos para niveles tróficos más altos.
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