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Cambio coherente de signos en las tendencias plurianuales del plancton microbiano
William K W Li1, W Glen Harrison, Erica J H Head
1Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada. LiB@mar.dfo-mpo.gc.ca
Science (New York, N.Y.)
|February 25, 2006
Resumen
La biomasa de fitoplancton y bacterioplancton muestra cambios relacionados en Nueva Escocia y el Mar de Labrador desde la década de 1990. Esto sugiere una respuesta acoplada del ecosistema a los cambios ambientales a lo largo de varios años.
Área de la Ciencia:
- Ecología marina ecología marina.
- Oceanografía La oceanografía es la oceanografía.
- Ecología microbiana ecología microbiana.
Sus antecedentes:
- La biomasa de fitoplancton en la plataforma escocesa y el mar de Labrador ha cambiado desde la década de 1990.
- La dinámica del bacterioplancton exhibe cambios amortiguados pero coherentes con el fitoplancton.
- Comprender estos cambios es crucial para la salud de los ecosistemas marinos.
Objetivo del estudio:
- Para investigar la relación entre los cambios en la biomasa de fitoplancton y bacterioplancton.
- Para determinar si existe un acoplamiento de nivel trófico en escalas de tiempo plurianuales.
- Identificar en todo el sistema las huellas ecológicas de forzamiento ambiental.
Principales métodos:
- Análisis de los datos de la biomasa de fitoplancton y bacterioplancton a largo plazo.
- Análisis de tendencias espacio-temporales de los cambios en la biomasa.
- Examen de los eventos de "cambio de señal" de la biomasa.
Principales resultados:
- Se observaron cambios sostenidos en la biomasa de fitoplancton en primavera y otoño.
- Los cambios en la biomasa de bacterioplancton reflejaron las tendencias del fitoplancton en dirección, pero con menor amplitud.
- El "cambio de señales" coherente en la biomasa se produjo tanto en el tiempo (estaciones) como en el espacio (ubicaciones).
Conclusiones:
- Los niveles tróficos (fitoplancton y bacterioplancton) están acoplados en escalas de tiempo de varios años.
- El interruptor de señales en tándem observado es una huella digital ecológica de forzamiento en todo el sistema.
- Estos hallazgos resaltan la interconexión de las comunidades microbianas marinas y la dinámica de los ecosistemas más grandes.
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