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Los métodos moleculares en el estudio de la sistemática y filogenia ...

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574<br />

At<strong>la</strong>s y Libro Rojo <strong>de</strong> los Anfibios y Reptiles <strong>de</strong> España<br />

ciones filog<strong>en</strong>éticas <strong>de</strong> Gallotia y a <strong>la</strong> evid<strong>en</strong>cia empírica adicional <strong>de</strong> <strong>la</strong> longitud d<strong>el</strong> trayecto y t<strong>en</strong>i<strong>en</strong>do <strong>en</strong> cu<strong>en</strong>ta<br />

<strong>la</strong> r<strong>el</strong>ativam<strong>en</strong>te baja capacidad <strong>de</strong> dispersión <strong>de</strong> los <strong>la</strong>cértidos <strong>en</strong> comparación con otros reptiles (ARNOLD,<br />

2000; CARRANZA et al. 2000), pue<strong>de</strong> concluirse que lo más probable es que <strong>la</strong> colonización <strong>de</strong> <strong>la</strong>s Is<strong>la</strong>s Canarias<br />

por parte <strong>de</strong> Gallotia fuese <strong>en</strong> s<strong>en</strong>tido este-oeste, colonizándose <strong>la</strong>s tres áreas biogeográficas una a continuación<br />

<strong>de</strong> <strong>la</strong> otra (sigui<strong>en</strong>do un mod<strong>el</strong>o tipo stepping stone). Aunque normalm<strong>en</strong>te no se pued<strong>en</strong> <strong>de</strong>ducir todos lo procesos<br />

biogeográficos acontecidos tan sólo con <strong>la</strong> información filog<strong>en</strong>ética, ésto no significa que sea imposible. Por<br />

ejemplo, <strong>en</strong> <strong>la</strong> Fig. 6D se muestran los conjuntos <strong>de</strong> is<strong>la</strong>s 1 y 2 parafiléticos. En este caso hipotético, y aplicando<br />

<strong>el</strong> principio <strong>de</strong> parsimonia, se pue<strong>de</strong> observar que <strong>de</strong> <strong>la</strong>s 12 hipótesis posibles <strong>de</strong> colonización sólo <strong>la</strong> 1 -> 2 -> 3<br />

es compatible con <strong>la</strong> filog<strong>en</strong>ia inv<strong>en</strong>tada.<br />

Agra<strong>de</strong>cimi<strong>en</strong>tos<br />

Agra<strong>de</strong>zco <strong>la</strong> co<strong>la</strong>boración <strong>de</strong> T. Luque, G. Giribet, E. N. Arnold y M. A. Arnedo por toda <strong>la</strong> ayuda e información<br />

prestadas durante <strong>la</strong> <strong>el</strong>aboración <strong>de</strong> este capítulo.<br />

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