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Probando la evolución impulsada por los depredadores con la regeneración del brazo crinoide del Paleozoico
Tomasz K Baumiller1, Forest J Gahn
1University of Michigan Museum of Paleontology, Ann Arbor, MI 48105, USA. tomaszb@umich.edu
Science (New York, N.Y.)
|September 9, 2004
Resumen
La regeneración del brazo crinoide muestra un aumento de los ataques de los depredadores durante el Siluro-Devónico, lo que indica una evolución impulsada por los depredadores. Esta evidencia fósil destaca el impacto de la depredación en los invertebrados marinos.
Área de la Ciencia:
- Paleontología Paleontología.
- Biología evolutiva Biología evolutiva.
- Ecología marina Ecología marina.
Sus antecedentes:
- La regeneración del brazo crinoide ofrece información sobre la dinámica depredador-presa.
- La depredación es un importante motor evolutivo a lo largo del tiempo geológico.
Objetivo del estudio:
- Para investigar el papel de la depredación en la evolución de los crinoides utilizando evidencia fósil.
- Para analizar las tendencias en la regeneración del brazo crinoide a través de la era paleozoica.
Principales métodos:
- Se examinaron 11 Lagerstätten (sitios fósiles) de crinoides del Paleozoico.
- Ejemplos cuantificados de regeneración del brazo en crinoides fosilizados.
Principales resultados:
- Se observó un aumento notable en la regeneración del brazo crinoide durante el Siluro-Devónico.
- Este intervalo coincide con el aumento de la diversidad de los depredadores aplastadores de conchas.
Conclusiones:
- Los datos de regeneración de crinoides sugieren un aumento en los ataques de depredadores no letales durante la Revolución Marina del Paleozoico Medio.
- Estos hallazgos apoyan el papel significativo de la evolución impulsada por los depredadores en los invertebrados marinos.
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