Data from: Hydrologic and geologic history of the Ozark Plateau drive phylogenomic patterns in a cave-obligate salamander
Phillips, John G.; Fenolio, Dante B.; Emel, Sarah L.; Bonett, Ronald M. (2018), Data from: Hydrologic and geologic history of the Ozark Plateau drive phylogenomic patterns in a cave-obligate salamander, Dryad, Dataset, https://doi.org/10.5061/dryad.7d1sn
Aim: Habitat specialization can constrain patterns of dispersal and drive allopatric
speciation in organisms with limited dispersal ability. Herein, we tested biogeographic
patterns and dispersal in a salamander with surface-dwelling larvae and obligate
Location: Ozark Plateau, eastern North America.
Methods: A population-level phylogeny of grotto salamanders (Eurycea spelaea complex)
was reconstructed using mitochondrial (mtDNA) and multi-locus nuclear DNA
(nucDNA), primarily derived from anchored hybrid enrichment (AHE). We tested
patterns of molecular variance among populations and associations between genetic
distance and geographic features.
Results: Divergence time estimates suggest rapid formation of three major lineages
in the Middle Miocene. Contemporary gene flow among divergent lineages appears
negligible, and mtDNA suggests that most populations are isolated. There is a significant
association between phylogenetic distance and palaeodrainages, contemporary
drainages and sub-plateaus of the Ozarks, as all features explain a proportion of
genetic variation. However, the combined effects of palaeodrainages and sub-plateaus
explain the greatest proportion of genetic variation.
Main conclusions: The geological and hydrological history of the Ozark Plateau has
influenced lineage diversification in the grotto salamander, leading to genetic isolation
among populations. Limited gene flow and strong phylogeographic structure in
this complex may result from the restriction of highly specialized adults to caves.
National Science Foundation, Award: (DEB 1050322