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El color del huevo de dinosaurio tenía un solo origen evolutivo.

Jasmina Wiemann1, Tzu-Ruei Yang2, Mark A Norell3

  • 1Department of Geology & Geophysics, Yale University, New Haven, CT, USA. jasmina.wiemann@yale.edu.

Nature
|November 23, 2018
PubMed
Resumen
Este resumen es generado por máquina.

Las aves modernas heredaron el color del huevo de los dinosaurios terópodos no aviares, no evolucionaron de forma independiente. Este antiguo rasgo, encontrado en huevos de dinosaurios fosilizados, revela complejos comportamientos reproductivos anteriores a las aves modernas.

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Área de la Ciencia:

  • Paleontología
  • Biología evolutiva
  • Biogeoquímica

Sus antecedentes:

  • Las aves son los únicos amniotas vivos con huevos de colores, considerados durante mucho tiempo una innovación aviar.
  • Descubrimientos recientes revelaron pigmentos responsables del color del huevo de las aves en una cáscara de huevo de dinosaurio no aviar.
  • Esto plantea preguntas sobre el origen evolutivo de la coloración del huevo: ¿heredado o evolucionado de forma independiente?

Objetivo del estudio:

  • Para llevar a cabo una evaluación filogenética del color del huevo en dinosaurios no aviares.
  • Para determinar si la coloración del huevo es un rasgo heredado de los dinosaurios no aviares o evolucionó de forma independiente en las aves.

Principales métodos:

  • La microspectroscopia Raman de alta resolución se aplicó a las cáscaras de huevo fosilizadas de los principales clado de dinosaurios.
  • La presencia y distribución de pigmentos se analizaron mediante espectroscopia y cartografía superficial.
  • Se utilizó el perfil de profundidad para examinar los mecanismos de deposición de pigmentos.

Principales resultados:

  • Los pigmentos de color de huevo se conservaron en todas las cáscaras de huevo de dinosaurios eumaniraptoran analizadas.
  • La coloración del huevo se originó una vez en dinosaurios terópodos no aviares, sin evidencia en huevos de ornitisquios y saurópodos.
  • Los huevos de eumaniraptoran no avianos exhibieron patrones moteados y moteados, similares a las aves existentes, lo que indica comportamientos reproductivos complejos.
  • Los mecanismos de deposición de pigmento en huevos de dinosaurios no aviares y aviares fueron idénticos.

Conclusiones:

  • La coloración del huevo no es una innovación aviar sino un rasgo antiguo que evolucionó en lo profundo de los dinosaurios terópodos.
  • Las aves modernas heredaron el color del huevo de sus antepasados dinosaurios no aviares.
  • Los hallazgos sugieren estrategias reproductivas más complejas en los dinosaurios no aviares de lo que se entendía anteriormente.