Genetic diversity and differentiation in south-western Australian bloodwoods (Corymbia section Calophyllae, Myrtaceae) with different ranges and abundance
Jane Sampson A , Sarah Tapper A , David Coates A , Margaret Hankinson A , Shelley McArthur A and Margaret Byrne
A *
+ Author Affiliations
- Author Affiliations
A Biodiversity and Conservation Science, Department of Biodiversity, Conservation and Attractions, Locked Bag 104, Bentley Delivery Centre, Perth, WA 6983, Australia.
Australian Journal of Botany 70(2) 146-157 https://doi.org/10.1071/BT21081
Submitted: 4 July 2021 Accepted: 20 December 2021 Published: 16 February 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)
Abstract
An understanding of how variation is shared within and among closely related species is important for understanding evolutionary processes and managing biological diversity. We studied genetic structure in the three species occurring in south-western Australia that form the small and distinct monophyletic section Calophyllae of the genus Corymbia. We compared diversity in nuclear microsatellites and chloroplast DNA sequences in two species with patchy distributions, namely, Corymbia haematoxylon (Maiden) K.D. Hill & L.A.S. Johnson and Corymbia ficifolia (F. Muell.) K.D. Hill & L.A.S. Johnson, with that in the widespread congener, C. calophylla (Lindl.) K.D. Hill & L.A.S. Johnson. Consistent with predictions for the influence of range and abundance on genetic structure in the Australian flora, population differentiation was higher in the two restricted patchy species than in the widespread, semicontinuous C. calophylla. Genetic diversity in C. haematoxylon was similar to that in C. calophylla, but diversity was lower in the highly localised C. ficifolia, likely owing to genetic bottlenecks. All three species were distinguished by nuclear SSR variation, but C. haematoxylon and C. ficifolia each shared chloroplast haplotypes with C. calophylla from incomplete lineage sorting of ancestral variation and introgression. Limited evidence of recent hybridisation in two populations of C. haematoxylon was also present.
Keywords: bottleneck, differentiation, diversity, expansion, forest tree, hybridisation, inbreeding, lineage sorting, localised range, patchy abundance.
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