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El conjunto de especies y la dinámica de las paleocomunidades marinas

M A Buzas, S J Culver

Science (New York, N.Y.)

|June 3, 1994

Resumen

Las comunidades foraminiferales del Cenozoico en la llanura costera atlántica carecieron de unidad durante 55 millones de años. Sin embargo, una reserva de especies dinámica era esencial para mantener la diversidad a través de la inmigración y los eventos de extinción.

Área de la Ciencia:

Paleontología Paleontología.
Biología Marina Biología Marina.
Geología Geología Geología.

Sus antecedentes:

Los depósitos de la plataforma cenozoica de la llanura costera atlántica de América del Norte preservan un registro a largo plazo de la vida marina.
Comprender la dinámica de la comunidad es crucial para interpretar los ecosistemas del pasado y predecir los cambios futuros.

Objetivo del estudio:

Para analizar la estabilidad a largo plazo y la composición de las comunidades foraminiferales.
Investigar el papel de los cambios ambientales (transgresiones y regresiones) en la configuración de estas comunidades.
Determinar la influencia de un grupo regional de especies en la estructura de la comunidad local.

Principales métodos:

Análisis de los conjuntos foraminiferales de los depósitos de la plataforma del Cenozoico.
El seguimiento de las especies de inmigración, emigración, origen y patrones de extinción.
Comparación de la composición de la comunidad durante las fases transgresivas y regresivas.

Principales resultados:

Las comunidades foraminiferales mostraron poca unidad durante 55 millones de años, caracterizadas por una importante rotación.
Las comunidades transgresoras comprendían una mezcla de especies nuevas y de regreso.
Los períodos de regresión llevaron a extinciones y emigraciones, y algunas especies no lograron recolonizarse.

Conclusiones:

Las comunidades foraminiferales locales carecían de unidad a largo plazo debido a los repetidos cambios ambientales.
Un grupo más amplio de especies de organismos neríticos en los márgenes continentales era vital para mantener la diversidad de especies.
La dinámica de las especies implicó un intercambio continuo con este grupo, lo que influyó en la biodiversidad local y regional.

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