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Controles sobre la biogeografía de las diatomeas en el océano
Pedro Cermeño1, Paul G Falkowski
1Environmental Biophysics and Molecular Ecology Program, Institute of Marine and Coastal Sciences, Rutgers University, 71 Dudley Road, New Brunswick, NJ 08901, USA. pedro@uvigo.es
Science (New York, N.Y.)
|September 19, 2009
Resumen
Las diatomeas marinas, algas microscópicas, no están limitadas por la dispersión a través de los océanos del mundo. Este hallazgo sugiere que la biodiversidad microbiana difiere significativamente de los organismos más grandes, lo que desafía los modelos biogeográficos tradicionales.
Área de la Ciencia:
- Microbiología marina microbiología marina.
- La paleoceanografía es la paleoceanografía.
- La biogeografía es la biogeografía.
Sus antecedentes:
- Comprender la distribución espacial microbiana es crucial para la ecología marina.
- Distinguir entre la selección ambiental y la limitación de la dispersión es un desafío debido a la variabilidad ambiental.
- Los microbios planctónicos marinos juegan un papel vital en los ecosistemas oceánicos.
Objetivo del estudio:
- Para investigar los controles biogeográficos en la distribución de los microbios planctónicos marinos.
- Para determinar si la dispersión o los factores ambientales locales forman principalmente las agrupaciones microbianas.
- Evaluar el papel de la limitación de la dispersión en la biodiversidad de las diatomeas marinas en escalas de tiempo geológicas.
Principales métodos:
- Análisis de los ensamblajes fósiles de diatomeas de los sedimentos oceánicos globales.
- Reconstrucción paleoceanográfica de las condiciones ambientales durante los últimos 1,5 millones de años.
- Análisis estadístico para diferenciar entre patrones de dispersión y de selección.
Principales resultados:
- Los ensamblajes fósiles de diatomeas no muestran evidencia de limitación de dispersión a través de los océanos del mundo.
- Las diatomeas marinas exhiben patrones de distribución muy extendidos, independientemente de las barreras geográficas.
- La selección ambiental parece ser un factor menos dominante de lo que se suponía anteriormente para las diatomeas.
Conclusiones:
- Las diatomeas marinas están dispersas globalmente, lo que indica mecanismos de dispersión eficientes.
- La biogeografía microbiana puede operar bajo principios diferentes a los de las especies macroscópicas.
- El aislamiento geográfico no es un factor primario de especiación en las diatomeas marinas.
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