Data from: Isolation by instability: historical climate change shapes population structure and genomic divergence of treefrogs in the Neotropical Cerrado savanna
Vasconcellos, Mariana M., The University of Texas at Austin
Colli, Guarino R., Departamento de Zoologia Universidade de Brasília Brasília Brazil
Weber, Jesse N., University of Alaska Anchorage
Ortiz, Edgardo M., The University of Texas at Austin
Miguel, T. Rodrigues, University of Sao Paulo
Cannatella, David C., The University of Texas at Austin
Published Feb 05, 2019 on Dryad.
Cite this dataset
Vasconcellos, Mariana M. et al. (2019). Data from: Isolation by instability: historical climate change shapes population structure and genomic divergence of treefrogs in the Neotropical Cerrado savanna [Dataset]. Dryad. https://doi.org/10.5061/dryad.17b7mt1
Although the impact of Pleistocene glacial cycles on the diversification of the tropical biota was once dismissed, increasing evidence suggests that Pleistocene climatic fluctuations greatly affected the distribution and population divergence of tropical organisms. Landscape genomic analyses coupled with paleoclimatic distribution models provide a powerful way to understand the consequences of past climate changes on the present-day tropical biota. Using genome-wide SNP data and mitochondrial DNA, combined with projections of the species distribution across the late Quaternary until the present, we evaluate the effect of paleoclimatic shifts on the genetic structure and population differentiation of Hypsiboas lundii, a treefrog endemic to the South American Cerrado savanna. Our results show a recent and strong genetic divergence in H. lundii across the Cerrado landscape, yielding four genetic clusters that do not seem congruent with any current physical barrier to gene flow. Isolation by distance (IBD) explains some of the population differentiation, but we also find strong support for past climate changes promoting range shifts and structuring populations even in the presence of IBD. Post Pleistocene population persistence in four main areas of historical stable climate in the Cerrado seems to have played a major role establishing the present genetic structure of this treefrog. This pattern is consistent with a model of reduced gene-flow in areas with high climatic instability promoting isolation of populations, defined here as “isolation by instability”, highlighting the effects of Pleistocene climatic fluctuations structuring populations in tropical savannas.
Presence points used in the Random Forest analyses of species distribution models.
Genetic distances (pairwise weighted FST) among populations used in the multiple matrix regression analysis.
Climatic stability resistances among populations generated in Circuitscape using the historical climatic suitability surface as an input raster.
Geographic resistances (including slope) generated in Circuitscape and used as our null model (topographically corrected IBD).
Geographic distances (in Km) among populations with 4 or more individuals only. This matrix was used to generate the isolation by distance plot in figure 6.
National Science Foundation, Award: NSF-DDIG DEB 1311517