viernes, 30 de marzo de 2012

El fuego: Un gran peligro para los dinosaurios







Además de los carnívoros peligrosos como el Tyrannosaurus rex y los climas duros, los dinosaurios que vivieron entre 65 millones y 145 millones de años  vivieron frente a otro peligro: el fuego






En un artículo publicado , los investigadores de la Universidad Royal Holloway de Londres y el Museo Field de Historia Natural de Chicago han demostrado que durante el Cretácico (145-65 millones de años) el fuego era mucho más habitual de lo que se pensaba anteriormente.




Los investigadores han encontrado muchos fósiles de carbón.  "El carbón es el remanente de las plantas que fueron quemadas y se conservan fácilmente en el registro fósil", explicó el profesor Andrew C. Scott, el director del proyecto del Royal Holloway.


En este período el mundo tenía un  efecto invernadero, donde las temperaturas globales eran más altas que los de hoy. Los rayos habría sido el principal detonante de estos incendios, pero este período fue también uno cuando los niveles de oxígeno atmosférico eran altos.


 
Science codex


Chicago Sun times



Ilustración1:"Iguanodón y pelecanimimus huyendo del fuego"
Nestor Dominguez Varela
ESPAÑA
Ilustración2:"Gallimimus-Therizinosaurus"
Davide Bonadonna
ITALIA

Ambas ilustraciones presentadas al III Concurso Internacional de Ilustraciones Científiccas de dinosaurios





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