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La explosión de Avalon: evolución del morfospacio de Ediacara.

Bing Shen¹, Lin Dong, Shuhai Xiao

¹Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA.

Science (New York, N.Y.)

|January 5, 2008

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Los primeros fósiles de Ediacara muestran toda la gama de vida compleja morphospace. Los ensamblajes posteriores tenían un morfospacio similar, pero variaron en diversidad de especies y variación morfológica.

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Área de la Ciencia:

Paleontología Paleontología.
Biología evolutiva Biología evolutiva.
Geología Geología Geología.

Sus antecedentes:

Los fósiles de Ediacara (hace 575-542 millones de años) son la vida macroscópica compleja más antigua conocida.
La evolución morfológica de estos antiguos organismos sigue siendo poco comprendida.

Objetivo del estudio:

Para analizar cuantitativamente la historia morfológica de los conjuntos fósiles de Ediacara.
Comprender los cambios de diversidad y la ocupación del morfospacio a lo largo del tiempo.

Principales métodos:

Análisis cuantitativo completo de los conjuntos de fósiles de Ediacara.
Estudio comparativo de los conjuntos de Avalon, Mar Blanco y Nama.

Principales resultados:

El conjunto más antiguo de Avalon (575-565 Ma) exhibió toda la gama de morfospacio de Ediacara.
Los ensamblajes posteriores del Mar Blanco y Nama ocuparon un morfospacio similar pero con diferentes estructuras de población.
La riqueza taxonómica aumentó en el conjunto del Mar Blanco y disminuyó en el conjunto Nama.
La varianza morfológica cambió inversamente con los cambios en la diversidad, mientras que el morfospacio se mantuvo constante.

Conclusiones:

El morfospacio de Ediacara se estableció temprano y se mantuvo relativamente constante.
La dinámica de la diversidad, no la expansión del morfospacio, caracterizó a los conjuntos posteriores de Ediacara.
La expansión morfospacial temprana de la vida de Ediacara puede compartir mecanismos con la explosión cámbrica posterior.