Varying levels of clonality and ploidy create barriers to gene flow and challenges for conservation of an Australian arid-zone ecosystem engineer,Acacia loderi

@article{Roberts2016VaryingLO,
  title={Varying levels of clonality and ploidy create barriers to gene flow and challenges for conservation of an Australian arid-zone ecosystem engineer,Acacia loderi},
  author={David G. Roberts and Cairo N. Forrest and Andrew J. Denham and David J. Ayre},
  journal={Biological Journal of The Linnean Society},
  year={2016},
  volume={118},
  pages={330-343}
}
Acacia loderi, the ecosystem engineer of the endangered Acacia loderi Shrublands in arid eastern Australia, spans a persistent (> 15 000 year) but poorly studied landscape feature, the Darling River. We investigated the genetic structure of 19 stands of eight to > 1000 plants separated by < 300 km to test for variation in life histories between semi-arid and arid stands to the east and west of the Darling River, respectively. Eight of nine stands east of the Darling were exclusively sexual… 

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References

SHOWING 1-10 OF 89 REFERENCES
Patterns of genotypic diversity suggest a long history of clonality and population isolation in the Australian arid zone shrub Acacia carneorum
TLDR
It is concluded that clonality has predominated in A. carneorum populations, with occasional sexual recruitment, and that current failure of most populations to set seed likely reflects both a long history of asexual reproduction and effects of habitat disturbance.
Microsatellite markers for vulnerable Australian aridzone Acacias
TLDR
Primers for eight microsatellite loci for Acacia carneorum and Acacia loderi allow assessment of the genetic diversity and connectedness of populations, the relative contribution of asexual reproduction to genotypic diversity and population structure, and use of paternity analysis to identify sires of seed within populations known to have set seed in past decades.
Significant population genetic structure detected for a new and highly restricted species of Atriplex (Chenopodiaceae) from Western Australia, and implications for conservation management
TLDR
This work investigates the structure of genetic variation within populations and subpopulations of this taxon using nuclear microsatellites and proposes management recommendations for this potentially new species in light of its highly structured genetic variation.
The evolution of sexual and parthenogenetic Warramaba: a window onto Plio–Pleistocene diversification processes in an arid biome
TLDR
The results strongly parallel those for sexual and parthenogenetic lineages of the gecko Heteronotia from the same region, indicating a highly general effect of Plio‐Pleistocene environmental change on diversification processes in arid Australia.
Genetic, cytogenetic and morphological patterns in a mixed mulga population: evidence for apomixis
TLDR
The aim of this project was to gain a better understanding of the relationships among mulga species and A. aneura varieties, as well as the maintenance of this variation, and to confirm the presence of genuine heterozygosity and clonality.
Contrasting Patterns of Clonality in Two Closely Related Mallee Species from Western Australia, Eucalyptus argutifolia and E. obtusiflora (Myrtaceae)
TLDR
Allozymes were used to investigate patterns of clonal growth (vegetativespread) in two closely related multi-stemmed eucalypts from WesternAustralia and suggest that the entire species may consist of less than 500 genets.
Defining conservation units in a rich and fragmented flora: implications for the management of genetic resources and evolutionary processes in south-west Australian plants
TLDR
Findings indicate the potential the identification and characterisation of conservation units, based on population genetic structure and phylogeographic patterns within species, provide a useful basis upon which more general conservation principals can be developed for the maintenance of these processes.
Granite outcrops as ancient islands in old landscapes: evidence from the phylogeography and population genetics of Eucalyptus caesia (Myrtaceae) in Western Australia
TLDR
The results obtained revealed high population and haplotype divergence, suggesting restriction to the specific habitat of granite outcrops over long time frames with genetic drift as the most significant evolutionary force.
...
...