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Naturaleza de la limitación del fósforo en el Mediterráneo oriental ultraoligotrófico
T F Thingstad1, M D Krom, R F C Mantoura
1Department of Biology, University of Bergen, Bergen, Norway. frede.thingstad@bio.uib.no
Science (New York, N.Y.)
|August 16, 2005
Resumen
La adición de fósforo al mar Mediterráneo oriental impulsó inesperadamente la producción de bacterias y el recuento de huevos de copépodos, a pesar de obstaculizar el crecimiento del fitoplancton. Esto sugiere nuevas vías de la red alimenticia microbiana para la transferencia de nutrientes.
Área de la Ciencia:
- Ecología microbiana marina ecología microbiana marina.
- Oceanografía La oceanografía es la oceanografía.
- Dinámica de la red alimentaria Dinámica de la red alimentaria Dinámica de la red alimentaria Dinámica de la red alimentaria
Sus antecedentes:
- El Mediterráneo oriental es ultraoligotrófico y carece de fósforo.
- El crecimiento del fitoplancton es a menudo co-limitado por nitrógeno y fósforo.
Objetivo del estudio:
- Investigar las respuestas de los ecosistemas a la adición de fosfato en el Mediterráneo oriental.
- Explorar las vías de transferencia de nutrientes en un entorno marino limitado por el fósforo.
Principales métodos:
- Experimento Lagrangiano en aguas superficiales.
- Monitoreo de la clorofila, la producción bacteriana y la abundancia de huevos de copépodos.
Principales resultados:
- La adición de fosfato condujo a una disminución de la clorofila.
- La producción bacteriana y la abundancia de huevos de copépodos aumentaron.
- Se observó colimitación de nitrógeno y fósforo en el fitoplancton.
Conclusiones:
- El fósforo puede ser transferido a los copépodos a través de bacterias heterotróficas o a través de desplazamientos estequiométricos de las presas.
- La red alimenticia microbiana juega un papel crucial en el ciclo de nutrientes y la transferencia de energía a niveles tróficos más altos.
- Las interacciones de los copépodos con los niveles tróficos inferiores pueden ser más complejas de lo que se entendía anteriormente.
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