Two waves of diversification in mammals and reptiles of Baja California revealed by hierarchical Bayesian analysis.
Many species inhabiting the Peninsular Desert of Baja California demonstrate a phylogeographic break at the mid-peninsula, and previous researchers have attributed this shared pattern to a single vicariant event, a mid-peninsular seaway. However, previous studies have not explicitly considered the inherent stochasticity associated with the gene-tree coalescence for species preceding the time of the putative mid-peninsular divergence. We use a Bayesian analysis of a hierarchical model to test for simultaneous vicariance across co-distributed sister lineages sharing a genealogical break at the mid-peninsula. This Bayesian method is advantageous over traditional phylogenetic interpretations of biogeography because it considers the genetic variance associated with the coalescent and mutational processes, as well as the among-lineage demographic differences that affect gene-tree coalescent patterns. Mitochondrial DNA data from six small mammals and six squamate reptiles do not support the perception of a shared vicariant history among lineages exhibiting a north-south divergence at the mid-peninsula, and instead support two events differentially structuring genetic diversity in this region.
Leaché
Adam D
AD
Museum of Vertebrate Zoology and Department of Integrative Biology, University of California, Berkeley, CA 94720-3160, USA. leache@berkeley.edu
Crews
Sarah C
SC
Hickerson
Michael J
MJ
D000818:Animals; D001499:Bayes Theorem; D002140:California; D005843:Geography; D008322:Mammals / Q000145:classification*; D008954:Models, Biological; D010802:Phylogeny; D012104:Reptiles / Q000145:classification*
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