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Significant population genetic structure detected for a new and highly restricted species of Atriplex (Chenopodiaceae) from Western Australia, and implications for conservation management

Citation

Clarke, LJ and Jardine, DI and Byrne, M and Shepherd, K and Lowe, AJ, Significant population genetic structure detected for a new and highly restricted species of Atriplex (Chenopodiaceae) from Western Australia, and implications for conservation management, Australian Journal of Botany, 60, (1) pp. 32-41. ISSN 0067-1924 (2012) [Refereed Article]

Copyright Statement

Copyright 2012 CSIRO

DOI: doi:10.1071/BT11223

Abstract

Atriplex sp. Yeelirrie Station (L. Trotter & A. Douglas LCH 25025) is a highly restricted, potentially new species of saltbush, known from only two sites ~30 km apart in central Western Australia. Knowledge of genetic structure within the species is required to inform conservation strategies as both populations occur within a palaeovalley that contains significant near-surface uranium mineralisation. We investigate the structure of genetic variation within populations and subpopulations of this taxon using nuclear microsatellites. Internal transcribed spacer sequence data places this new taxon within a clade of polyploid Atriplex species, and the maximum number of alleles per locus suggests it is hexaploid. The two populations possessed similar levels of genetic diversity, but exhibited a surprising level of genetic differentiation given their proximity. Significant isolation by distance over scales of less than 5 km suggests dispersal is highly restricted. In addition, the proportion of variation between the populations (12%) is similar to that among A. nummularia populations sampled at a continent-wide scale (several thousand kilometres), and only marginally less than that between distinct A. nummularia subspecies. Additional work is required to further clarify the exact taxonomic status of the two populations. We propose management recommendations for this potentially new species in light of its highly structured genetic variation.

Item Details

Item Type:Refereed Article
Keywords:Atriplex, saltbush, population genetics, microsatellite, polyploid, internal transcribed spacer
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Population, Ecological and Evolutionary Genetics
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Sparseland, Permanent Grassland and Arid Zone Flora, Fauna and Biodiversity
Author:Clarke, LJ (Dr Laurence Clarke)
ID Code:104029
Year Published:2012
Web of Science® Times Cited:11
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2015-11-01
Last Modified:2017-11-02
Downloads:0

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