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Las distribuciones de abundancia implican una elevada complejidad de los ecosistemas marinos del pospaleozoico
Peter J Wagner1, Matthew A Kosnik, Scott Lidgard
1Department of Geology, Field Museum of Natural History, 1400 South Lake Shore Drive, Chicago, IL 60605, USA. pwagner@fmnh.org
Science (New York, N.Y.)
|November 25, 2006
Resumen
Los ecosistemas marinos se volvieron más complejos después de la era paleozoica. El evento de extinción del final del Pérmico alteró permanentemente la vida marina, lo que condujo a un aumento de la biodiversidad y la complejidad en el Meso-Cenozoico.
Área de la Ciencia:
- Paleontología Paleontología.
- Ecología marina Ecología marina.
- Biología evolutiva Biología evolutiva.
Sus antecedentes:
- Los ensamblajes de fósiles marinos del Fanerozoico muestran cambios en las distribuciones de abundancia relativa.
- La teoría ecológica vincula las distribuciones de abundancia con la complejidad del ecosistema.
Objetivo del estudio:
- Analizar los cambios en la estructura y complejidad de los ecosistemas marinos a lo largo del Fanerozoico.
- Para investigar el impacto de la extinción del final del Pérmico en la biodiversidad marina.
Principales métodos:
- Análisis de probabilidad de 1176 ensamblajes fósiles.
- Comparación de las comunidades marinas del Paleozoico y del Meso-Cenozoico.
- Evaluación de los cambios en la composición de la fauna (sésil vs. móvil, epifaunal vs. infaunal).
Principales resultados:
- Un cambio significativo en las distribuciones de abundancia relativa ocurrió después del Paleozoico.
- Los conjuntos meso-cenozoicos exhiben una mayor complejidad ecológica que los paleozoicos.
- La transición fue impulsada por un cambio de los alimentadores de suspensión sesil a diversos taxones móviles e infaunales.
Conclusiones:
- La extinción de finales del Pérmico alteró permanentemente la estructura del ecosistema marino.
- Este evento de extinción precipitó una mayor complejidad ecológica y diversidad alfa en el Meso-Cenozoico.
- Los cambios en los métodos de conservación o recolección de fósiles no explican el cambio ecológico observado.
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