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Un catastrófico ensamblaje de muertes e implicaciones paleoclimáticas de las aves marinas del plioceno de Florida
Science (New York, N.Y.)
|April 29, 1994
Resumen
Las aves marinas fósiles en Florida revelan un evento catastrófico del Plioceno, posiblemente una marea roja. Este descubrimiento apoya la evidencia de un antiguo surgimiento de agua fría y una disminución en la riqueza de especies de vertebrados marinos.
Área de la Ciencia:
- Paleontología Paleontología.
- Biología Marina Biología Marina.
- Dinámica climática del neógeno Dinámica climática del neógeno Dinámica climática del neógeno
Sus antecedentes:
- Los depósitos fósiles del Plioceno tardío de Florida ofrecen información sobre los ecosistemas marinos extintos.
- El análisis filogenético conecta a los cormoranes extintos con las especies modernas del Pacífico.
- La evidencia sugiere un evento de mortalidad masiva que afectó a las antiguas poblaciones de aves marinas.
Objetivo del estudio:
- Para analizar un importante depósito de fósiles de aves marinas del Plioceno tardío de Florida.
- Para investigar el paleoambiente y la dinámica ecológica de la costa del Golfo de Florida del Plioceno.
- Para correlacionar la evidencia de fósiles de aves con otros indicadores marinos de cambio ambiental.
Principales métodos:
- Excavación y análisis de más de 130 esqueletos fósiles de aves marinas.
- Examen paleontológico de la fauna marina asociada y evidencia de moluscos.
- Evaluación geológica de la emergencia del puente terrestre panameño y su impacto.
Principales resultados:
- Identificación de una especie extinta de cormorán filogenéticamente vinculada a las poblaciones modernas del este del Pacífico Norte.
- Evidencia de un solo evento de mortalidad catastrófica, potencialmente una marea roja.
- Las aves marinas fósiles, los mamíferos marinos y los moluscos apoyan colectivamente el surgimiento de aguas frías del Plioceno.
- Una disminución en la riqueza de especies de vertebrados marinos se correlaciona con el cese de la subida.
Conclusiones:
- El registro fósil del Plioceno de Florida indica cambios paleoambientales significativos.
- Los eventos catastróficos y los cambios en las condiciones oceanográficas impactaron profundamente a las comunidades de vertebrados marinos.
- La aparición del puente terrestre panameño jugó un papel en la alteración de los ecosistemas marinos.
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