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Preservación de la abundancia de especies en las agrupaciones de muerte marina
1Department of Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637 USA. skidwell@midway.uchicago.edu
Science (New York, N.Y.)
|November 3, 2001
Resumen
Los ensamblajes de muertes fósiles reflejan con precisión el orden de las especies comunitarias vivas, a pesar del transporte y el promedio de tiempo. Este hallazgo valida el uso de datos fósiles para la investigación ecológica y paleontológica.
Área de la Ciencia:
- Paleobiología Paleobiología.
- Ecología marina Ecología marina.
- La tafonomía es la tafonomía.
Sus antecedentes:
- Los ensamblajes fósiles pueden no reflejar comunidades vivas debido a procesos postmortem como el transporte y el promedio de tiempo.
- Los datos precisos de abundancia de especies son cruciales para los estudios ecológicos y paleontológicos.
Objetivo del estudio:
- Evaluar estadísticamente si los ensamblajes de muerte de fósiles promediados en el tiempo preservan el orden de clasificación original de la abundancia de especies de las comunidades vivas.
- Determinar la fiabilidad de los ensamblajes fósiles para la reconstrucción de series de tiempo ecológicas.
Principales métodos:
- Realizó un metanálisis estadístico de 85 conjuntos de datos de moluscos marinos.
- Evaluó la influencia de los factores ambientales y el tamaño de la malla del tamiz en la fidelidad del ensamblaje.
Principales resultados:
- Los ensamblajes de muertes promediadas en el tiempo conservan una fuerte señal del orden de clasificación de las especies originales.
- La fidelidad de ensamblaje es sensible al tamaño de la malla del tamiz y a las condiciones ambientales.
- Los datos fósiles proporcionan información confiable sobre la abundancia de especies.
Conclusiones:
- Los ensamblajes de muertes naturalmente acumuladas son una fuente confiable de datos de abundancia de especies.
- Estos datos son clave para el avance de la investigación paleobiológica y macroecológica.
- Los ensamblajes fósiles permiten la extensión de series de tiempo ecológicas a través de núcleos sedimentarios.
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