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Hybridization as a dispersal mechanism


Potts, BM and Reid, JB, Hybridization as a dispersal mechanism, Evolution, 42, (6) pp. 1245-1255. ISSN 0014-3820 (1988) [Refereed Article]

Copyright Statement

Copyright 1988 Evolution

DOI: doi:10.2307/2409008


An example from the genus Eucalyptus is used to argue that hybridization may be of evolutionary significance as a means of gene dispersal where seed dispersal is limited. A previous study of regeneration of E. risdonii and E. amygdalina indicated that the current selective regime was favoring E. risdonii. However, the dispersal of E. risdonii by seeds is shown to be limited (Ss = 4.6 m). By comparison, the flow of E. risdorii genes into the range of E. amygdalina by pollen dispersal and F1 hybridization is widespread (Sp = 82 m). While the actual level of hybridization is low, interspecific hybridization effectively doubles the dispersal of E. risdonii genes into the range of E. amygdalina. This pollen flow can have a significant genetic impact, since isolated hybrids or patches of abnormal phenotypes have been found 200-300 m from the species boundary. Based on lignotuber size, same of these patches appear to have been founded by F1 hybrids. The frequency of E. risdonii types in the patches appears to increase with patch size suggesting that there is selection for this phenotype in subsequent generations. E. risdonii-like individuals were recovered in the progeny from both intermediate and E. risdonii backcross phenotypes. These results suggest that E. risdonii may invade suitable habitat islands within the E. amygdalina forest, independently of seed migration, by long-distance pollen migration followed by selection for the gene combinations of the pollen parent.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant biology not elsewhere classified
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Native forests
UTAS Author:Potts, BM (Professor Brad Potts)
UTAS Author:Reid, JB (Professor Jim Reid)
ID Code:87047
Year Published:1988
Web of Science® Times Cited:110
Deposited By:Plant Science
Deposited On:2013-11-06
Last Modified:2016-03-03

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