Landscape drivers of genomic diversity and divergence in woodland Eucalyptus

Title
Landscape drivers of genomic diversity and divergence in woodland Eucalyptus
Publication Date
2019-12
Author(s)
Murray, Kevin D
Janes, Jasmine K
( author )
OrcID: https://orcid.org/0000-0002-4511-2087
Email: jjanes@une.edu.au
UNE Id une-id:jjanes
Jones, Ashley
Bothwell, Helen M
Andrew, Rose L
( author )
OrcID: https://orcid.org/0000-0003-0099-8336
Email: randre20@une.edu.au
UNE Id une-id:randre20
Borevitz, Justin O
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
Wiley-Blackwell Publishing Ltd
Place of publication
United Kingdom
DOI
10.1111/mec.15287
UNE publication id
une:1959.11/52776
Abstract

Spatial genetic patterns are influenced by numerous factors, and they can vary even among coexisting, closely related species due to differences in dispersal and selection. Eucalyptus (L'Héritier 1789; the "eucalypts") are foundation tree species that provide essential habitat and modulate ecosystem services throughout Australia. Here we present a study of landscape genomic variation in two woodland eucalypt species, using whole-genome sequencing of 388 individuals of Eucalyptus albens and Eucalyptus sideroxylon. We found exceptionally high genetic diversity (π ≈ 0.05) and low genome-wide, interspecific differentiation (FST = 0.15) and intraspecific differentiation between localities (FST ≈ 0.01-0.02). We found no support for strong, discrete population structure, but found substantial support for isolation by geographic distance (IBD) in both species. Using generalized dissimilarity modelling, we identified additional isolation by environment (IBE). Eucalyptus albens showed moderate IBD, and environmental variables have a small but significant amount of additional predictive power (i.e. IBE). Eucalyptus sideroxylon showed much stronger IBD and moderate IBE. These results highlight the vast adaptive potential of these species and set the stage for testing evolutionary hypotheses of interspecific adaptive differentiation across environments.

Link
Citation
Molecular Ecology, 28(24), p. 5232-5247
ISSN
1365-294X
0962-1083
Start page
5232
End page
5247
Rights
Attribution 4.0 International

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