期刊
BIOLOGY LETTERS
卷 6, 期 2, 页码 216-218出版社
ROYAL SOC
DOI: 10.1098/rsbl.2009.0707
关键词
squamata; Iguania; viviparity; phylogeny; molecular clock
资金
- Clarkson University
- National Science Foundation [DBI-0109205, DBI-0314092, DEB-0616630]
Among tetrapods, viviparity is estimated to have evolved independently within Squamata (lizards and snakes) more than 100 times, most frequently in species occupying cold climate environments. Because of this relationship with cold climates, it is sometimes assumed that many origins of squamate viviparity occurred over the past 2.5-4 Myr during the Pliocene-Pleistocene glaciations; however, this hypothesis is untested. Divergence-dating analysis on a 733-species tree of Iguanian lizards recovers 20 independent lineages that have evolved viviparity, of which 13 multispecies groups derived live birth prior to glacial advances (8-66 Myr ago). These results place the transitions from egg-laying to live birth among squamates in a well-supported historical context to facilitate examination of the underlying phenotypic and genetic changes associated with this complex shift in reproduction.
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