Journal ArticleDOI
Genomic diversity, population structure, and migration following rapid range expansion in the Balsam Poplar, Populus balsamifera
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TLDR
It is suggested that an in‐depth knowledge of nucleotide diversity following expansion requires sampling within multiple populations, and the utility of combining insights from different data types in population genomic studies is highlighted.Abstract:
Rapid range expansions can cause pervasive changes in the genetic diversity and structure of populations. The postglacial history of the Balsam Poplar, Populus balsamifera, involved the colonization of most of northern North America, an area largely covered by continental ice sheets during the last glacial maximum. To characterize how this expansion shaped genomic diversity within and among populations, we developed 412 SNP markers that we assayed for a range-wide sample of 474 individuals sampled from 34 populations. We complemented the SNP data set with DNA sequence data from 11 nuclear loci from 94 individuals, and used coalescent analyses to estimate historical population size, demographic growth, and patterns of migration. Bayesian clustering identified three geographically separated demes found in the Northern, Central, and Eastern portions of the species’ range. These demes varied significantly in nucleotide diversity, the abundance of private polymorphisms, and population substructure. Most measures supported the Central deme as descended from the primary refuge of diversity. Both SNPs and sequence data suggested recent population growth, and coalescent analyses of historical migration suggested a massive expansion from the Centre to the North and East. Collectively, these data demonstrate the strong influence that range expansions exert on genomic diversity, both within local populations and across the range. Our results suggest that an in-depth knowledge of nucleotide diversity following expansion requires sampling within multiple populations, and highlight the utility of combining insights from different data types in population genomic studies.read more
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The Amborella Genome and the Evolution of Flowering Plants
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Of glaciers and refugia: a decade of study sheds new light on the phylogeography of northwestern North America.
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Ecological genomics meets community-level modelling of biodiversity: mapping the genomic landscape of current and future environmental adaptation.
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Daniel G. Gavin,Matthew C. Fitzpatrick,Paul F. Gugger,Katy D. Heath,Francisco Rodríguez-Sánchez,Solomon Z. Dobrowski,Arndt Hampe,Arndt Hampe,Feng Sheng Hu,Michael B. Ashcroft,Patrick J. Bartlein,Jessica L. Blois,Bryan C. Carstens,Edward Byrd Davis,Guillaume de Lafontaine,Mary E. Edwards,Matias Fernandez,Paul D. Henne,Erin M. Herring,Zachary A. Holden,Woo-Seok Kong,Jianquan Liu,Donatella Magri,Nicholas J. Matzke,Matt S. McGlone,Frédérik Saltré,Alycia L. Stigall,Yi-Hsin Erica Tsai,John W. Williams +28 more
TL;DR: A critical research need is to better integrate and reconcile the three major lines of evidence used to infer the existence of past refugia - fossil records, species distribution models and phylogeographic surveys - in order to characterize the complex spatiotemporal trajectories of species and populations in and out ofRefugia.
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Spatially explicit Bayesian clustering models in population genetics.
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References
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