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Termofisiología de Tyrannosaurus rex: Evidencia de los isótopos de oxígeno
Resumen
La composición isotópica del oxígeno en los huesos fósiles revela la temperatura corporal. Tyrannosaurus rex probablemente mantuvo una temperatura corporal estable, lo que sugiere características endotérmicas.
Área de la Ciencia:
- Paleontología Paleontología.
- Biogeoquímica La biogeoquímica es la bioquímica.
- La paleotermometría es una técnica de paleotermometría.
Sus antecedentes:
- La composición isotópica de oxígeno del fosfato óseo de vertebrados (delta(p)) refleja el agua ingerida y la temperatura corporal durante la formación ósea.
- Los isótopos de oxígeno del fosfato óseo están en equilibrio con el agua corporal, que es fisiológicamente estable en todo el cuerpo.
Objetivo del estudio:
- Para determinar la variación de la temperatura intrabono y las diferencias de temperatura entre los huesos en vertebrados fósiles bien conservados.
- Para evaluar la regulación de la temperatura corporal y la tasa metabólica del Tyrannosaurus rex.
Principales métodos:
- Análisis de la composición isotópica del oxígeno (delta(p)) en el fosfato óseo de vertebrados fósiles.
- Utilizando las variaciones delta (p) para inferir las fluctuaciones de temperatura dentro y entre los huesos.
Principales resultados:
- Los datos de isótopos de oxígeno de un fósil de Tyrannosaurus rex indican una variabilidad de la temperatura corporal de menos de 4 grados C.
- Esta temperatura corporal estable sugiere homeotermia en el Tyrannosaurus rex.
Conclusiones:
- La homeotermia en el Tyrannosaurus rex implica una tasa metabólica relativamente alta, comparable a las endotermia modernas.
- El análisis de isótopos de oxígeno del fosfato óseo es un método viable para reconstruir la termorregulación en vertebrados extintos.
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