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La postura del cuello y los hábitos alimenticios de dos dinosaurios saurópodos jurásicos
1Computer and Information Science, University of Oregon, Eugene, OR 97403, USA. Biological Sciences, Northern Illinois University, DeKalb, IL 60115, USA.
Science (New York, N.Y.)
|April 30, 1999
Resumen
Las reconstrucciones digitales muestran que los cuellos de Diplodocus y Apatosaurus eran menos flexibles de lo que se pensaba, lo que sugiere una alimentación a nivel del suelo. Estos dinosaurios de cuello largo probablemente navegaron bajo, no alto, desafiando suposiciones anteriores.
Área de la Ciencia:
- Paleontología Paleontología.
- La biomecánica es la biomecánica.
- Zoología de los vertebrados Zoología de los vertebrados.
Sus antecedentes:
- Los dinosaurios saurópodos, en particular los diplodocidos como el Diplodocus y el Apatosaurus, poseían cuellos excepcionalmente largos.
- Las hipótesis anteriores sugirieron que estos cuellos largos facilitaban la navegación en lo alto, alcanzando una vegetación elevada.
- La biomecánica y la morfología funcional de los cuellos de saurópodos siguen siendo temas de investigación y debate en curso.
Objetivo del estudio:
- Para reconstruir digitalmente las vértebras cervicales de Diplodocus y Apatosaurus.
- Para determinar la postura neutral y el rango de movimiento (capa de alimentación) de sus cuellos.
- Para inferir estrategias de alimentación basadas en posturas cervicales reconstruidas y flexibilidad.
Principales métodos:
- Reconstrucciones digitales articuladas de las columnas cervicales de dos especies diplodocidas.
- Análisis de las posturas neutrales y no desviadas del cuello y las posiciones de la cabeza en relación con el cuerpo.
- Evaluación de la flexibilidad del cuello, incluidas las capacidades de curvatura lateral y dorsal (hacia arriba).
Principales resultados:
- La postura neutral del cuello tanto para Diplodocus como para Apatosaurus era casi recta, disminuyendo suavemente hacia abajo.
- Las cabezas se colocaron cerca del nivel del suelo en su postura neutral debido a la angulación del cuello y la cabeza.
- La flexibilidad del cuello era menor de lo que se representaba convencionalmente; Diplodocus mostró menos movilidad lateral y dorsal que Apatosaurus.
Conclusiones:
- Las posturas cervicales reconstruidas y la flexibilidad limitada sugieren una adaptación para la alimentación en tierra o la navegación baja.
- Estos hallazgos desafían la visión tradicional de los saurópodos diplodocidas como navegadores superiores.
- El estudio proporciona nuevos conocimientos sobre los roles ecológicos y los comportamientos de alimentación de los grandes dinosaurios herbívoros.
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