Skip to main content
. 2016 Jul 10;118(3):431–444. doi: 10.1093/aob/mcw115

Table 1.

Observed outbreeding depression (± estimated standard errors) and corresponding significance probability in the F1 (HF1) and F2 (HF2) generations of E. globulus × E. nitens hybrids. Measured traits in the Tyenna trial at age 20 years from planting include percentage of tree survival, diameter at breast height (DBH) growth, percentage of alive trees that are reproductive, and capsule score for the survivors

Percentage of tree survival (%) DBH growth (cm) Percentage of alive trees that are reproductive Capsule score (score)
HF1

  • −42·7 ± 7·4

  • P ≤ 0·001

  • (−52·9)

  • −8·6 ± 2·6

  • P = 0·017

  • (−27·0)

  • −31·1 ± 7·8

  • P = 0·004

  • (−41·1)

  • −1·3 ± 0·1

  • P ≤ 0·001

  • (−63·4)
HF2

  • −55·8 ± 4·1

  • P ≤ 0·001

  • (−69·1)

  • −14·4 ± 2·2

  • P ≤ 0·001

  • (−45·1)

  • −34·9 ± 9·9

  • P = 0·009

  • (−46·2)

  • −1·4 ± 0·2

  • P ≤ 0·001

  • (−68·3)

In parentheses, the H values are also expressed as a percentage of the mean of the parental populations (mid-parent value) to facilitate comparison of outbreeding depression across different traits [as well as for comparison with results at previous ages reported for DBH and tree survival by Costa e Silva et al. (2012)]. For all traits, both of the F1 and the F2 hybrid generation differed significantly (at the 5 % level) from either of the two parental populations (Fig. 4).