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Aparición de la anoxia en el actual gran ecosistema marino de California
F Chan1, J A Barth, J Lubchenco
1Department of Zoology, Oregon State University, Corvallis, OR 97331, USA. chanft@science.oregonstate.edu
Science (New York, N.Y.)
|February 16, 2008
Resumen
Se ha observado un nuevo aumento en la anoxia de la plataforma de la columna de agua, un evento de oxígeno extremadamente bajo, en el sistema de la Corriente de California. Este hallazgo pone de relieve el potencial de un cambio rápido del ecosistema en entornos marinos productivos.
Área de la Ciencia:
- Ecología marina Ecología marina.
- Oceanografía La oceanografía es la oceanografía.
- Biogeoquímica La biogeoquímica es la bioquímica.
Sus antecedentes:
- Los sistemas de corrientes fronterizas orientales son grandes ecosistemas marinos altamente productivos.
- El flujo ascendente trae aguas ricas en nutrientes y empobrecidas de oxígeno a las plataformas continentales.
- Estos estantes son susceptibles a eventos extremos de bajo oxígeno.
Objetivo del estudio:
- Para informar sobre la ocurrencia sin precedentes de anoxia de la plataforma de la columna de agua en el sistema de corriente del norte de California.
- Para investigar las implicaciones de este nuevo evento anóxico para un importante ecosistema marino.
Principales métodos:
- Recopilación de datos de observación en el sistema de corriente de California.
- Análisis de las propiedades de la columna de agua, incluyendo los niveles de oxígeno.
- Evaluación de la extensión y características de las zonas anóxicas.
Principales resultados:
- El estudio documenta la primera observación de anoxia significativa de la plataforma de la columna de agua en el norte de la corriente de California.
- Este evento anóxico ocurrió en una región previamente desconocida por tal agotamiento extremo de oxígeno.
- La expansión de la anoxia indica un cambio significativo en la dinámica del oxígeno del ecosistema.
Conclusiones:
- El aumento de la anoxia en el sistema de la corriente de California representa un desarrollo nuevo y preocupante.
- Este fenómeno subraya el potencial de cambios abruptos y discontinuos en los ecosistemas costeros productivos.
- Tales cambios pueden tener profundos impactos en la pesca y la biodiversidad marina.
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