Ref ID: 10153
Ref Type: Journal
Authors: Barbour, R. C., Potts, B. M., and Vaillancourt, R. E.
Pub Date: 2003
Journal Name: Australian Journal of Botany
Volume: 51
Issue: 4
Start Page: 429
End Page: 439
ISBN/ISSN:
Keywords: Australia/classification/detection/dispersal/establishment/eucalypt/Eucalyptus/Eucalyptus nitens/Eucalyptus ovata/Eucalyptus rodwayi/Eucalyptus viminalis/exotic/F1/flow/gene/gene flow/Genetic pollution/hybrid/hybridisation/hybrids/impact/intermediate/island/isozyme/location/morphology/native/natural/pattern/plantation/plantations/pollen/seed/seedling/seedlings/site/sites/species/Tasmania
Abstract: F1 hybrids between exotic E. nitens plantations and native E. ovata, have previously been reported among seedlings propagated from open-pollinated seed collected from E. ovata, on the island of Tasmania. Such exotic hybrids were 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 to only 0.4 % for natural hybrids between native species at these sites (E. ovata, E. viminalis and E. rodwayi). Hybrids detection was initially based on their deviant morphology, which was generally intermediate between parental species. This subjective classification was then successfully verified using morphometric and isozyme analyses. Pure E. nitens 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. The long term impact of such hybridisation is yet to be assessed.
Notes: Entered by Brad Potts (28/1/2003)
Reprint: Not in File
Program: SPF Genetic Improvement
Project: A1
Deliverable:
Confidentiality: Public
Availability: Authors;
Report: Annual Report 2002/3; Annual Report 2003/4
Type: Article
Address: B.M.Potts@utas.edu.au