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Gene flow between introduced and native Eucalyptus species


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Barbour, RC, Potts, BM, Vaillancourt, RE, Tibbits, WN and Wiltshire, RJE 2002 , 'Gene flow between introduced and native Eucalyptus species' , New Forests, vol. 23, no. 3 , pp. 177-191 , doi: 10.1023/A:1020389432492.

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The first evidence of in situ F hybridisation between an introduced eucalypt plantation 1
species, Eucalyptus nitens, and a native eucalypt species is presented. Open-pollinated seed was collected
from a mature E. nitens trial and from the adjacent native species, E. ovata and E. viminalis on the island
of Tasmania. Nearly 70 000 seedlings were grown to a size at which hybrids could be clearly
distinguished from pure species seedlings on the basis of morphology and a nearly species-specific
isozyme allele. Hybridisation was observed between E. nitens and E. ovata, but no hybrids involving E.
viminalis were found. This pattern of hybridisation was consistent with the flowering time overlap
between the E. ovata and E. nitens. Eucalyptus nitens progenies displayed a low and relatively
homogeneous level of hybridisation, averaging 0.15% per tree. In comparison, the proportion of hybrids
obtained from the adjacent E. ovata trees varied from 0.04 to 16% per tree.Whether progeny arising from
such hybridisation will survive and grow in nature to allow for backcrossing and introgression of the
exotic genes into the native population is not yet known.

Item Type: Article
Authors/Creators:Barbour, RC and Potts, BM and Vaillancourt, RE and Tibbits, WN and Wiltshire, RJE
Keywords: Exotic, Genetic pollution, Hybridisation, Introgression, Plantation, Pollen dispersal, Seed orchard contamination
Journal or Publication Title: New Forests
ISSN: 0169-4286
DOI / ID Number: 10.1023/A:1020389432492
Additional Information:

BM Potts. The original publication is available at

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