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Respuesta fenotípica del Petaurus notatus invasor en Tasmania
Meagan Powley1, Katarina Mikac1
1School of Science, Environmental Futures, University of Wollongong, Northfields Ave, Wollongong, NSW 2500, Australia.
Journal of mammalogy
|December 17, 2025
Resumen
El Petaurus notatus introducido en Tasmania muestra cambios distintivos en la forma del cráneo. Estas variaciones morfológicas pueden indicar adaptación a nuevas presiones ecológicas, incluyendo un posible cambio hacia la carnivoría.
Área de la Ciencia:
- Biología evolutiva
- Zoología
- Ecología
Sus antecedentes:
- El Petaurus notatus (planeador de Krefft), un planeador nocturno arbóreo nativo de Australia continental, fue introducido en Tasmania en la década de 1830.
- La introducción y propagación del Petaurus notatus en Tasmania se ha relacionado con la depredación de aves nativas y migratorias.
- Comprender las respuestas fenotípicas a la introducción es crucial para evaluar el impacto ecológico.
Objetivo del estudio:
- Investigar si el Petaurus notatus experimentó una respuesta fenotípica discernible en la morfología del cráneo tras su introducción en Tasmania.
- Comparar la forma del cráneo entre las poblaciones de Petaurus notatus de Krefft en Tasmania y su área nativa en Victoria.
Principales métodos:
- Se empleó la morfometría geométrica para analizar la variación en la forma del cráneo.
- Se compararon especímenes de Tasmania (n=57) y Victoria (n=102).
Principales resultados:
- Se detectó una variación significativa en la forma del cráneo entre los especímenes de Petaurus notatus de Tasmania y Victoria.
- Los planeadores de Tasmania exhibieron una mayor longitud del rostro (particularmente en el mesocráneo), un desplazamiento dorsal de los huesos frontales y un aumento del ángulo posterior del proceso coronoides en la mandíbula.
- Estos cambios morfológicos son consistentes con las adaptaciones observadas en otras especies vinculadas a una mayor carnivoría.
Conclusiones:
- La introducción del Petaurus notatus en Tasmania ha resultado en cambios observables en la morfología del cráneo.
- Aunque los impulsores ecológicos específicos no están claros, las variaciones observadas sugieren una adaptación potencial, posiblemente relacionada con cambios dietéticos hacia la carnivoría u otras presiones ambientales.
- Se necesita más investigación para dilucidar los factores precisos que impulsan estas adaptaciones morfológicas.
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