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Table 2 Variance partitioning of phenology and biomass traits using REML-linear mixed models for the comparison of trait responses across 29 Populations over two years and Year × Population interactions

From: Phenotypic plasticity of natural Populus trichocarpa populations in response to temporally environmental change in a common garden

   Bud set Canopy duration Growth period Leaf drop Post-bud set period Active growth rate Height: diameter
  N DF D DF F/ χ2 P D DF F/ χ2 P D DF F/ χ2 P D DF F/ χ2 P D DF F/ χ2 P D DF F/ χ2 P D DF F/ χ2 P
Popltn 28 582 44.02 < 10−4 509 21.44 < 10−4 547 36.11 < 10− 4 619 42.20 < 10− 4 497 23.464 < 10− 4 573 17.53 < 10− 4 609 13.03 < 10−4
Year 1 424 297.48 < 10−4 458 441.68 < 10−4 436 556.53 < 10−4 439 263.22 < 10−4 410 93.455 < 10−4 444 123.08 < 10−4 456 1.40 1
Popltn × Year 28 424 6.08 < 10−4 459 2.55 0.004 437 5.48 < 10−4 439 7.26 < 10−4 411 6.913 < 10−4 445 3.18 < 10−4 456 2.44 0.001
Genetics 1 NA 54.79 < 10−4 NA 6.31 0.12 NA 27.22 < 10−4 NA 92.109 < 10−4 NA 11.424 0.008 NA 45.39 < 10−4 NA 80.167 < 10−4
Model fit statistics R2 0.878 0.735 0.846 0.894 0.714 0.763 0.718
AIC 6393.95 6381.67 6751.05 5372.29 6050.42 −42.16 5953.03
REML 6273.95 6261.67 6631.05 5252.29 5930.42 − 162.16 5833.03
  1. We report on F-values for fixed effects and on χ2-values for random effects (i.e., ‘Genetics’). Significance of random effects was assessed using likelihood ratio tests. Significant P-values after the sequential Bonferroni correction (α = 0.05) are shown in bold. Denominator degrees of freedom (D DF) are calculated using the Satterthwaite’s approximation as implemented in the R package lmerTest. Popltn: Population. Variance-partitioning for ecophysiology traits reported in Additional file 1: Table S3