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Allozyme variation and conservation of the Tasmanian endemics, Eucalyptus risdonii, E. tenuiramis and E. coccifera


Turner, CL and Wiltshire, RJE and Potts, BM and Vaillancourt, RE, Allozyme variation and conservation of the Tasmanian endemics, Eucalyptus risdonii, E. tenuiramis and E. coccifera, Conservation Genetics, 1, (3) pp. 209-215. ISSN 1566-0621 (2000) [Refereed Article]

DOI: doi:10.1023/A:1011501720944


The rare Tasmanian endemic Eucalyptus risdonii is thought to have arisen as a result of small, heterochronic changes to the genome of its more widespread sister species, E. tenuiramis. Previous morphological studies have shown that genetic differentiation between populations of E. risdonii and southern E. tenuiramis is continuous and much smaller than the separation between the southern and northern morphotypes of E. tenuiramis. However, morphological traits may be influenced by selection, possibly leading to convergence, requiring an independent measure of genetic variation. We studied allozyme frequency variation in E. risdonii, southern E. tenuiramis (parapatric with E. risdonii), northern E. tenuiramis (disjunct from southern populations), and E. coccifera (as an outgroup). Each morphotype had a level of genetic diversity close to the average reported in ten other eucalypt species with similar distributions but the coefficients of population differentiation within morphotypes were lower than in most other eucalypt species. The overall difference between morphotypes was extremely small, possibly as a result of recent and rapid differentiation, but may also be the result of gene flow from other peppermint taxa, including E. amygdalina and E. pulchella. Southern E. tenuiramis has greater genetic affinity with E. risdonii than with northern E. tenuiramis which supports recent evolutionary divergence of E. risdonii. In this study we have shown that taxonomic units are not necessarily aligned with an equitable partition of the gene pool and that conservation units should be much broader than single taxa in order to preserve evolutionary processes.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Other biological sciences
Research Field:Other biological sciences not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the environmental sciences
UTAS Author:Turner, CL (Ms Claire Turner)
UTAS Author:Wiltshire, RJE (Dr Robert Wiltshire)
UTAS Author:Potts, BM (Professor Brad Potts)
UTAS Author:Vaillancourt, RE (Professor Rene Vaillancourt)
ID Code:21128
Year Published:2000
Deposited By:Plant Science
Deposited On:2000-08-01
Last Modified:2011-08-04

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