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Little genetic differentiation within the dominant forest tree, Eucalyptus marginata (Myrtaceae) of south-western Australia

Wheeler, M.A., Byrne, M. and McComb, J.A. (2003) Little genetic differentiation within the dominant forest tree, Eucalyptus marginata (Myrtaceae) of south-western Australia. Silvae Genetica, 52 (5-6). pp. 254-259.

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Abstract

Genetic diversity in the continuously distributed Eucalyptus marginata Donn ex Smith from south-western Australia was investigated using nuclear RFLP loci. Diversity was assessed in 15 populations from across the range of E. marginata, including the three morphologically recognised subspecies, and one population of the closely related E. staeri. Moderate levels of genetic diversity (H T = 0.345) were detected in Eucalyptus marginata but there was little genetic structure and low differentiation between populations (θ = 0.034), Isolation by distance was observed, but there was differing influence of gene flow and drift over different spatial scales. There was no genetic support for the recognition of three subspecies, or the informal division of northern and southern forms recognised by foresters. Some populations showed a high fixation index most likely due to neighbourhood structure within populations. The lack of genetic structure and low population differentiation indicates that collection of germplasm for rehabilitation of forest sites following mining or Phythophthora cinnamomi infection, may be made at a regional scale.

Publication Type: Journal Article
Murdoch Affiliation: School of Biological Sciences and Biotechnology
Publisher: J.D. Sauerlander Verlag
URI: http://researchrepository.murdoch.edu.au/id/eprint/16460
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