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Ecological speciation in sympatric palms: 3. Genetic map reveals genomic islands underlying species divergence in Howea

Journal article
Authors A. S. T. Papadopulos
J. Igea
L. T. Dunning
O. G. Osborne
X. Quan
J. Pellicer
C. Turnbull
I. Hutton
W. J. Baker
Roger Butlin
V. Savolainen
Published in Evolution
Volume 73
Issue 9
Pages 1986-1995
ISSN 0014-3820
Publication year 2019
Published at Department of marine sciences
Pages 1986-1995
Language en
Links dx.doi.org/10.1111/evo.13796
Keywords ddRAD, genetic map, genome, speciation, sympatry
Subject categories Ecology, Evolutionary Biology

Abstract

Although it is now widely accepted that speciation can occur in the face of continuous gene flow, with little or no spatial separation, the mechanisms and genomic architectures that permit such divergence are still debated. Here, we examined speciation in the face of gene flow in the Howea palms of Lord Howe Island, Australia. We built a genetic map using a novel method applicable to long-lived tree species, combining it with double digest restriction site–associated DNA sequencing of multiple individuals. Based upon various metrics, we detected 46 highly differentiated regions throughout the genome, four of which contained genes with functions that are particularly relevant to the speciation scenario for Howea, specifically salt and drought tolerance. © 2019 The Author(s). Evolution © 2019 The Society for the Study of Evolution.

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