Phylogenetic relationships in the iguanid lizard genus Liolaemus: Multiple origins of viviparous reproduction and evidence for recurring Andean vicariance and dispersal

James A. Schulte, J. Robert Macey, Robert E. Espinoza, Allan Larson

Research output: Contribution to journalArticlepeer-review

245 Scopus citations

Abstract

Phylogenetic relationships within the iguanid lizard genus Liolaemus are investigated using 1710 aligned base positions (785 phylogenetically informative) of mitochondrial DNA sequences, representing coding regions for eight tRNAs, ND2, and portions of ND1 and COI. Sixty new sequences ranging in length from 1736 to 1754 bases are compared with four previously reported sequences. Liolaemus species form two well-supported monophyletic groups of subgeneric status, Liolaemus and Eulaemus. These subgenera appear to have separated at least 12.6 million years ago based on the amount of molecular evolutionary divergence between them. Hypotheses that species occurring in the Andes, west of the Andes, and east of the Andes, each comprise distinct monophyletic groups are independently rejected statistically. The shortest estimate of phylogeny suggests that Liolaemus originated either in the Andes or the eastern lowlands. Numerous evolutionary shifts have occurred between the Andes, and the eastern and western lowlands, suggesting recurring vicariance and dispersal. Species occurring at high elevations or high latitudes usually have viviparous reproduction. Depending on whether parity mode is considered reversible in Liolaemus, the most parsimonious reconstruction supports at least six independent origins of viviparity or at least three gains followed by three losses of viviparity among the 60 Liolaemus lineages examined. (C) 2000 The Linnean Society of London.

Original languageEnglish
Pages (from-to)75-102
Number of pages28
JournalBiological Journal of the Linnean Society
Volume69
Issue number1
DOIs
StatePublished - Jan 2000

Keywords

  • Andes
  • Historic al biogeography
  • Iguania
  • Iguanidae
  • Liolaemus
  • Phylogeny
  • Reproduction
  • Reptilia
  • South America
  • Squamata
  • Viviparity

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