Heterosis may result in selection favouring the products of long-distance pollen dispersal in Eucalyptus.

At Geeveston, the mean DBH of the long-distance crosses was only marginally (at the 5% significance level) greater than the mid-parent value by age 13 years, but at Weilangta highly significant ( P ≤0.001) heterosis was evident by age 9 years ( Table 1 ).

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