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Las excavadoras biológicas y la evolución de las comunidades bentónicas marinas
Science (New York, N.Y.)
|February 2, 1979
Resumen
Los alimentadores de suspensión inmóviles en fondos marinos blandos disminuyeron durante el Fanerozoico. El aumento de la perturbación de los sedimentos por los alimentadores de los depósitos probablemente causó estas extinciones.
Área de la Ciencia:
- Paleontología Paleontología.
- Biología Marina Biología Marina.
- Ecología Ecología Ecología.
Sus antecedentes:
- Las comunidades bentónicas marinas han sufrido cambios evolutivos significativos.
- Comprender las tendencias a largo plazo en la biodiversidad y la extinción es crucial para la ecología marina.
Objetivo del estudio:
- Para investigar los cambios en la diversidad de los alimentadores de suspensión inmóviles en sustratos blandos (ISOSS) durante el Fanerozoico.
- Para determinar las tasas de extinción de ISOSS en comparación con otros organismos bentónicos.
- Para identificar los impulsores ecológicos detrás de la disminución de ISOSS.
Principales métodos:
- Análisis de los registros fósiles de la era Fanerozoica.
- Análisis comparativo de las tendencias de diversidad en diferentes grupos ecológicos (ISOSS, habitantes de sustratos duros, taxones móviles).
- Correlación de las tasas de extinción con los factores ecológicos.
Principales resultados:
- Una disminución significativa en la diversidad de ISOSS a lo largo del Fanerozoico.
- Más altas tasas de extinción para el ISOSS en comparación con otras especies de fauna bentónica.
- Diversificación observada en taxones inmóviles en superficies duras y en taxones móviles.
- El aumento de la bioturbación por los alimentadores de los depósitos se identificó como un factor clave.
Conclusiones:
- El declive de ISOSS está relacionado con el aumento de la perturbación biológica de los sedimentos.
- La diversificación de los alimentadores de depósitos jugó un papel importante en la alteración de los entornos de sedimentos blandos.
- Estos cambios rediseñaron la estructura de la comunidad bentónica marina a lo largo del tiempo geológico.
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