Historical persistence and isolation by distance of Mirbelia viminalis (Fabaceae) across the Hamersley Range of the Pilbara bioregion
Melissa A. Millar
A * , Rachel M. Binks A , Sarah-Louise Tapper A , Bronwyn M. Macdonald A , Shelley L. McArthur A , Margaret Hankinson A , David J. Coates A , Stephen van Leeuwen A B and Margaret Byrne A
+ Author Affiliations
- Author Affiliations
A Department of Biodiversity, Conservation and Attractions, Biodiversity and Conservation Science, Locked Bag 104, Bentley Delivery Centre, Bentley, WA 6983, Australia.
B Present address: School of Molecular and Life Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
Australian Journal of Botany 70(5) 358-371 https://doi.org/10.1071/BT22014
Submitted: 7 February 2022 Accepted: 25 July 2022 Published: 26 August 2022
© 2022 The Department of Biodiversity, Conservation and Attractions, WA. 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
Context: Empirical studies of intraspecific genetic diversity and population structure can inform the evolutionary and demographic history of individual species and of landscapes at the bioregional level.
Aims: We aimed to assess intraspecific genetic variation at macroevolutionary and microevolutionary temporal scales for Mirbelia viminalis, a key species present on the Hamersley Range in the ancient and highly diverse landscape of the Pilbara bioregion of northwest Western Australia.
Methods: We sampled extant populations and assessed diversity and structure using sequences (chloroplast DNA, 1759 base pairs) and microsatellite markers (nuclear DNA, 15 loci) data.
Key results: Significant phylogeographic structure and a lack of historical demographic signals of population contraction or expansion suggest historical population persistence. Moderate chloroplast haplotype diversity (h = 15) and moderate divergence among extant haplotypes indicates a degree of historical connectivity via seed dispersal across central populations on the Hamersley Range. Levels of nuclear genetic diversity were low to moderate (allelic richness = 3.554, expected heterozygosity = 0.489, observed heterozygosity = 0.462) and depauperate compared to another member of the Mirbelia genus present further south in the Midwest region. Nuclear diversity revealed a strong signal of isolation by distance with localised admixture among populations and some contemporary genetic clustering along a north-west to south-east transect of the Hamersley Range.
Conclusions: Low nuclear genetic diversity may be related to recent reductions in population size for M. viminalis. Historical population persistence with few barriers to dispersal other than geographic distance may be common for members of the Fabaceae across the Hamersley Range.
Keywords: arid landscape, demography, dispersal, Fabaceae, genetic connectivity, genetic diversity, genetic structure, haplotypes, phylogeography.
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