Dispersal of viviparity in fire salamanders

Abstract:

Retention of ancestral states or lineage sorting in diverging populations are usual explanations for discordance between nuclear and mitochondrial DNA gene trees. However, this discordance may also result from gene introgression during reticulation events. Females of fire salamanders Salamandra salamandra either give birth to individuals that bypass the aquatic larval stage entirely (viviparity), or give birth to small aquatic larvae (ovoviviparity). Based on mtDNA sequences from 45 populations of fire salamanders in the Iberian Peninsula and data on nuclear markers from the literature, the authors performed a phylogeographic analysis to elucidate evolutionary processes acting on the populations and their influence on the evolution of viviparity. Two major discordances were found by plotting the geographic ranges defined by mtDNA and nuclear genes. Given that nuclear markers show high concordance in …

Año de publicación:

2003

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Fuente:

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