Reconstrucción de las características de historia de vida en los ancestros de los tordos: un análisis de las adaptaciones al parasitismo de cría
Resumen
Los tordos parásitos de cría ponen sus huevos en los nidos de otras especies (hospederos), dependiendo de ellos para su reproducción. Se ha propuesto que los tordos habrían modificado ciertas características de historia de vida como adaptaciones para desarrollar este comportamiento. Específicamente, poseerían menor peso del huevo, menor período de incubación, mayor grosor de la cáscara del huevo, mayor tasa de crecimiento de los pichones y menor peso de los pichones cuando abandonan el nido. Un análisis reciente utilizando contrastes independientes filogenéticos encontró que los valores observados de estas características en los tordos solo difieren de los valores predichos para las especies no parásitas en el grosor de la cáscara del huevo. En este trabajo reanalizamos si estas características son potenciales adaptaciones al parasitismo de cría en los tordos a partir de la reconstrucción de ancestros bajo dos modelos de evolución de caracteres. Al comparar los valores ancestrales reconstruidos a partir de los tordos con los obtenidos a partir de las especies no parásitas, solo encontramos diferencias en el grosor de la cáscara del huevo. Esto demuestra que ambas técnicas (la reconstrucción de ancestros y los contrastes independientes filogenéticos) son consistentes, por lo cual el hecho de que solo el mayor grosor de la cáscara del huevo puede ser una adaptación potencial es un resultado muy robusto.
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