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Gene flow between introduced and native Eucalyptus species: exotic hybrids are establishing in the wild

Citation

Barbour, RC and Potts, BM and Vaillancourt, RE, Gene flow between introduced and native Eucalyptus species: exotic hybrids are establishing in the wild, Australian Journal of Botany, 51, (4) pp. 429-439. ISSN 0067-1924 (2003) [Refereed Article]

DOI: doi:10.1071/BT03016

Abstract

F1 hybrids between exotic Eucalyptus nitens plantations and native E. ovata have previously been reported among seedlings grown from open-pollinated seed collected from E. ovata, on the island of Tasmania. Such exotic hybrid seedlings have now been found in the wild adjacent to plantations at three locations. The proportion of exotic hybrids in open-pollinated seed collected from nearby mature E. ovata was 5.5%. This level compares with only 0.4% for natural hybrids between native species at these sites (E. ovata, E. viminalis and E. rodwayi). Detection of hybrids was initially based on their deviant morphology, which was generally intermediate between parental species. This subjective classification was then successfully verified by morphometric and allozyme analyses. Pure E. nitens seedlings (wildlings) were restricted to within 30 m of these plantations, whereas established hybrids were found up to 310 m from the plantations. This pattern of establishment reflects dispersal of exotic seed and pollen respectively. It is likely that the recent expansion of the eucalypt plantation estate in Australia will cause an increase in the frequency of exotic hybrids. However, the long-term impact of such hybridisation is yet to be assessed.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Population, Ecological and Evolutionary Genetics
Objective Division:Plant Production and Plant Primary Products
Objective Group:Environmentally Sustainable Plant Production
Objective Field:Environmentally Sustainable Plant Production not elsewhere classified
Author:Barbour, RC (Dr Robert Barbour)
Author:Potts, BM (Professor Brad Potts)
Author:Vaillancourt, RE (Professor Rene Vaillancourt)
ID Code:27819
Year Published:2003
Web of Science® Times Cited:28
Deposited By:Plant Science
Deposited On:2003-08-01
Last Modified:2009-07-31
Downloads:0

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