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Table 3 Across-trial estimates of variances, narrow-sense individual heritability, narrow-sense family heritability, type B genetic correlation, relative expected genetic gain by selecting the top 1%, standard error (between parentheses), and relative magnitudea [between brackets, %] for intra-ring density traits estimated at year 24 from progeny trials in the mixed and boreal forests

From: Rapid assessment of wood traits for large-scale breeding selection in Picea mariana [Mill.] B.S.P.

Vegetation subzone Mixed forest Boreal forest
Parameter EWD res LWD res IDV res LWP res EWD res LWD res IDV res LWP res
\( {\widehat{\sigma}}_F^2 \) 1.30b 1.50b 0 4.57E-05 0.99b 1.14 0 0
(0.62) (0.52)   (3.97E-05) (0.58) (0.76)   
[4.7] [5.6] [0] [1.4] [2.9] [3.2] [0] [0]
\( {\widehat{\sigma}}_{S\ast F}^2 \) 0.61 0 0.007 0 0 0.31 0.025b 0
(0.61)   (0.012)    (0.88) (0.013)  
[2.2] [0] [0.9] [0] [0] [0.9] [4.2] [0]
\( {\widehat{\sigma}}_{\varepsilon}^2 \) 26.00b 25.58b 0.815b 0.0033b 33.63b 34.08b 0.565b 0.0060b
(1.14) (1.09) (0.036) (0.0001) (1.60) (1.68) (0.028) (0.0003)
[93.1] [94.4] [99.1] [98.6] [97.1] [95.9] [95.8] [100]
\( {\widehat{h}}_{ind}^2 \) 0.19 0.22 0 0.05 0.11 0.13 0 0
(0.09) (0.07)   (0.05) (0.07) (0.08)   
\( {\widehat{h}}_{fam}^2 \) 0.44 0.54 0 0.21 0.31 0.32 0 0
(0.14) (0.09)   (0.15) (0.13) (0.17)   
\( {\widehat{r}}_B \) 0.68b 1b 0 1b 1b 0.79 0 .
(0.28) (0)   (0) (0) (0.54)   
\( {\widehat{G}}_{1\%} \) 13.42 12.58 0 1.76 7.22 7.82 0 0
  1. EWD res Resistograph® earlywood density, LWD res Res. latewood density, IDV res Res. intra-ring density variation, LWP res Res. latewood proportion
  2. aPercentage of each estimated variance component to total (phenotypic) variance \( \left({\widehat{\sigma}}_p^2={\widehat{\sigma}}_F^2+{\widehat{\sigma}}_{S\ast F}^2+{\widehat{\sigma}}_{\varepsilon}^2\right) \).
  3. bSignificantly different from 0 (for \( {\widehat{r}}_B \)) or significantly positive (for variance estimates) at the 5% significance level. See Table 2 for parameter definitions.