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Los primeros dinosaurios del Cretácico del Sáhara
Science (New York, N.Y.)
|October 14, 1994
Resumen
Los fósiles de dinosaurios del Sahara revelan una amplia distribución en toda Pangea antes de la ruptura continental. Las distintas faunas de dinosaurios del hemisferio sur evolucionaron a medida que los continentes se aislaron durante el período Cretácico.
Área de la Ciencia:
- Paleontología Paleontología.
- Biogeografía del Mesozoico.
- Evolución de los vertebrados.
Sus antecedentes:
- La fragmentación de Pangea durante la era Mesozoica es una cuestión clave en la biogeografía.
- Los registros de fósiles de dinosaurios son abundantes en los continentes del norte, pero escasos en los del sur.
- El aislamiento continental alcanzó su punto máximo durante el período Cretácico.
Objetivo del estudio:
- Para investigar la distribución de los dinosaurios a través de Pangea antes de su fragmentación.
- Comprender los orígenes de distintas faunas de dinosaurios en masas terrestres aisladas.
- Para analizar el impacto de la deriva continental en la evolución de los dinosaurios.
Principales métodos:
- Excavación y análisis de esqueletos de dinosaurios de los lechos del Cretácico Inferior en el sur del Sahara.
- Análisis comparativo de los registros fósiles de los continentes norte y sur.
- Reconstrucción de los patrones de distribución biogeográfica de los dinosaurios.
Principales resultados:
- Descubrimiento de fósiles de terópodos tetanuranos y saurópodos de dientes anchos en el sur del Sahara.
- La evidencia sugiere que estos linajes de dinosaurios eran cosmopolitas a través de Pangea.
- Los continentes del sur muestran distintas faunas dinosaurias que se desarrollaron durante el Cretácico.
Conclusiones:
- Los linajes de dinosaurios estaban muy extendidos antes de la fragmentación continental.
- La supervivencia diferencial de linajes en masas terrestres aisladas condujo a distintas faunas del Cretácico.
- La biogeografía mesozoica fue moldeada tanto por eventos de dispersión como de vicarianza.
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