10.5061/DRYAD.8RF538CP
Smith, Gilbert
University of St Andrews
Lohse, Konrad
University of Edinburgh
Etges, William J.
University of Arkansas System
Ritchie, Michael G.
University of St Andrews
Data from: Model-based comparisons of phylogeographic scenarios resolve
the intraspecific divergence of cactophilic Drosophila mojavensis
Dryad
dataset
2012
isolation-with-migration
Drosophila mojavensis
incipient speciation
Ecological selection
2012-03-16T16:59:11Z
2012-03-16T16:59:11Z
en
https://doi.org/10.1111/j.1365-294X.2012.05604.x
40589 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
The cactophilic fly Drosophila mojavensis exhibits considerable
intraspecific genetic structure across allopatric geographic regions and
shows associations with different host cactus species across its range.
The divergence between these populations has been studied for more than 60
years, yet their exact historical relationships have not been resolved. We
analysed sequence data from 15 intronic X-linked loci across populations
from Baja California, mainland Sonora-Arizona and Mojave Desert regions
under an isolation-with-migration model to assess multiple scenarios of
divergence. We also compared the results with a pre-existing sequence
dataset of 8 autosomal loci. We derived a population tree with Baja
California placed at its base and link their isolation to Pleistocene
climatic oscillations. Our estimates suggest the Baja California
population diverged from an ancestral Mojave Desert/mainland
Sonora-Arizona group around 230-270 Kya, while the split between the
Mojave Desert and mainland Sonora-Arizona populations occurred one glacial
cycle later, 117-135 Kya years ago. Although we found these three
populations to be effectively allopatric, model ranking could not rule out
the possibility of a low-level of gene flow between two of them. Finally,
the Mojave Desert population showed a small effective population size,
consistent with a historical population bottleneck. We show that
model-based inference from multiple loci can provide accurate information
on the historical relationships of closely related groups allowing us to
set into historical context a classic system of incipient ecological
speciation.
IMa2 input filesInput files for sequence analysis in IMa2. Files in the
archive include 3 pairwise comparisons of populations from Smith et al
data and 3 from Machado et al (2007), labelled by population comparison
(see manuscript) and data source. The last file is for comparison of all
populations for the Smith et al data. All files contain locus ID, DNA
sequence (aligned using MAFFT - see manuscript for details) and locus
specific mutation rates. Line 1= general info, line 2 = number of
populations, line 3 = tree topology, line 4 = number of loci, thereafter =
sequence data.
NW Mexico
SW United States