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La regulación de la temperatura corporal por algunos reptiles marinos del Mesozoico
Aurélien Bernard1, Christophe Lécuyer, Peggy Vincent
1CNRS UMR 5125, Paléoenvironnements et Paléobiosphère, Université Lyon 1, Lyon, 2 Rue Raphaël Dubois, 69622 Villeurbanne Cedex, France.
Science (New York, N.Y.)
|June 12, 2010
Resumen
Los reptiles marinos extintos como los ictiosaurios, plesiosaurios y mosasaurios probablemente eran de sangre caliente, manteniendo altas temperaturas corporales para la depredación activa y la natación de larga distancia en los antiguos océanos.
Área de la Ciencia:
- Paleontología Paleontología.
- Paleoecología Paleoecología.
- Fisiología Fisiología Fisiología.
Sus antecedentes:
- Comprender la termorregulación en vertebrados extintos es crucial para su ecología y evolución.
- El estado térmico de los reptiles marinos del Mesozoico sigue siendo en gran medida desconocido.
- La termorregulación puede haber contribuido al éxito evolutivo de estos depredadores máximos.
Objetivo del estudio:
- Para determinar la temperatura corporal y las estrategias de termorregulación de reptiles marinos extintos.
- Para investigar el estado térmico de los ictiosaurios, plesiosaurios y mosasaurios.
- Para comparar la fisiología térmica de estos reptiles con los peces que coexisten.
Principales métodos:
- Análisis de las composiciones de isótopos de oxígeno en fosfatos fósiles de dientes.
- Comparación de isótopos de fosfato dental de reptiles marinos y peces que coexisten.
- Reconstrucción de las temperaturas corporales basadas en datos isotópicos.
Principales resultados:
- Los ictiosaurios, plesiosaurios y mosasaurios mantenían temperaturas corporales altas y constantes.
- Las temperaturas estimadas del cuerpo oscilaron entre 35°C y 39°C.
- Estas temperaturas fueron consistentes a través de entornos oceánicos templados tropicales a fríos.
Conclusiones:
- Estos grandes reptiles marinos exhibieron altas tasas metabólicas.
- La endotermia probablemente apoyó sus estilos de vida depredadores y sus extensas migraciones mar adentro.
- La termorregulación jugó un papel importante en su éxito ecológico.
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