PHYLOGENY AND PHYLOGEOGRAPHY OF THE LIOLAEMUS DARWINII COMPLEX (SQUAMATA: LIOLAEMIDAE): EVIDENCE FOR INTROGRESSION AND INCOMPLETE LINEAGE SORTING

• Published in: Evolution Vol. 58; no. 4; pp. 842 - 859
• Main Authors: Morando, Mariana, Avila, Luciano J., Baker, Jay, Sites Jr, Jack W.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01-04-2004
• Subjects: Argentina; cytochrome b; cytochrome b, introgression; introgression; lineage sorting; Liolaemus; Liolaemus, phylogeography; phylogeography
• ISSN: 0014-3820; 1558-5646
• DOI: 10.1111/j.0014-3820.2004.tb00416.x

Although mitochondrial DNA markers have several properties that make them suitable for phylogeographic studies, they are not free of difficulties. Phylogeographic inferences within and between closely related species can be mislead by introgression and retention of ancestral polymorphism. Here we combine different phylogenetic, phylogeographic, and population genetic methods to extract the maximum information from the Liolaemus darwinii complex. We estimate the phylogeographic structure ofL. darwinii across most of its distributional range, and we then estimate relationships between L. darwinii and the syntopic species L. laurenti and L. grosseorum. Our results suggest that range expansion of these lineages brought them into secondary contact in areas where they are presently in syntopy. Here we present the first evidence for introgression in lizards from temperate South America (ofL. darwinii mitochondrial DNA into L. laurenti and L. grosseorum), and for incomplete lineage sorting (between L. darwinii and L. laurenti). We show that a combination of methods can provide additional support for inferences derived from any single method and thus provide more robust interpretations and narrow the range of plausible hypotheses about mechanisms and processes of divergence. Additional studies are needed in this group of lizards and in other codis‐tributed groups to determine if Pleistocene climatic changes could be a general factor influencing the evolutionary history of a regional biota.