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Patrones onshore-offshore en la evolución de las comunidades de la plataforma del Fanerozoico

D Jablonski, J J Sepkoski, D J Bottjer

Science (New York, N.Y.)

|December 9, 1983

Resumen

Las innovaciones ecológicas en los ecosistemas marinos se originan cerca de la costa y se expanden hacia el exterior, reemplazando a las comunidades más antiguas. Este patrón desafía las suposiciones sobre la rotación de especies marinas y la dinámica evolutiva.

Área de la Ciencia:

Paleontología Paleontología.
Ecología marina Ecología marina.
Biología evolutiva Biología evolutiva.

Sus antecedentes:

Las comunidades bentónicas marinas exhiben patrones evolutivos complejos a lo largo del tiempo geológico.
Comprender la dinámica espacial de la innovación ecológica es crucial para los estudios evolutivos.

Objetivo del estudio:

Investigar los orígenes espaciales y la expansión de las principales innovaciones ecológicas en los ecosistemas marinos.
Para analizar el patrón evolutivo onshore-innovación, offshore-arcaico.

Principales métodos:

Análisis de clúster de las comunidades bentónicas marinas del Cámbrico-Ordoviciano.
Análisis trófico comunitario de las faunas de las plataformas del Cretácico Superior.

Principales resultados:

Las principales innovaciones ecológicas aparecieron por primera vez en entornos cercanos a la costa.
Estas innovaciones luego se expandieron a través de la plataforma, reemplazando a los tipos de comunidades más antiguos.
Se observó un patrón onshore-innovación, offshore-arcaico, contrario a las expectativas de una mayor facturación en alta mar.

Conclusiones:

El patrón evolutivo observado sugiere diferencias en las tasas de extinción u origen entre los entornos nearshore y offshore.
Los entornos cercanos a la costa pueden actuar como centros cruciales para el surgimiento de nuevas asociaciones ecológicas y novedades evolutivas.

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