Molecular genetic diversity and population structure in Eucalyptus pauciflora subsp. pauciflora (Myrtaceae) on the island of Tasmania
Archana Gauli A C , Dorothy A. Steane A B , René E. Vaillancourt A and Brad M. Potts A
+ Author Affiliations
- Author Affiliations
A School of Biological Sciences and National Centre for Future Forest Industries, University of Tasmania, Private Bag 55, Hobart, Tas. 7001, Australia.
B Faculty of Science, Health, Education and Engineering and Collaborative Research Network, University of the Sunshine Coast, Locked Bag 4, Maroochydore, Qld 4558, Australia.
C Corresponding author. Email: Archana.Gauli@utas.edu.au
Australian Journal of Botany 62(3) 175-188 https://doi.org/10.1071/BT14036
Submitted: 23 February 2014 Accepted: 18 May 2014 Published: 27 June 2014
Abstract
Genetic diversity and population structure of Tasmanian populations of Eucalyptus pauciflora were assessed using chloroplast and nuclear microsatellite markers. Maternal trees and open-pollinated progeny from 37 populations were sampled across the species’ geographic and altitudinal distribution in Tasmania. The distribution of chloroplast haplotype richness showed a clear geographic structure with suggestion of three major refugia (Storm Bay, Tamar Valley and St Pauls River Valley), two of which are consistent with previously reported glacial refugia. Chloroplast haplotype affinities provided evidence of migration of populations from the north and east towards the south and west of Tasmania. High nuclear microsatellite diversity was observed across the species’ range. Most of this variation was distributed within populations with low but significant FST, suggesting high gene flow among populations that is more pronounced in mature stands. Higher nuclear genetic diversity in newly colonised areas compared with lowland putative refugial regions, and the converse in chloroplast DNA markers, suggest limited seed dispersal into newly colonised regions combined with high pollen flow between different source populations in newly colonised areas. Our results do not support the suggestion that highland populations of E. pauciflora originate from in situ high-altitude refugia, but instead argue they originate from lowland refugia.
Additional keywords: Eucalyptus pauciflora, genetic diversity, haplotypes, molecular markers, spatial structure.
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