Table II. Best predictors of seasonal variation for LT50 and 16-kD dehydrin in P. strobus needles determined by linear mixed-effects modeling

P value, P value of difference between predictor model and null model; Tmin, minimum daily temperature; Tmean, mean daily temperature. AIC scores are provided to indicate goodness-of-fit for each predictor model; higher ΔAIC scores indicate higher goodness-of-fit.

RankPredictorAICΔAICP value
LT50
Null model508.60
 1Photoperiod430.8877.72<0.001
 2Tmin471.7836.83<0.001
 3Photoperiod:Tmin472.6635.94<0.001
 4Photoperiod:Tmean488.5320.08<0.001
 5Tmean495.0913.51<0.001
 Full modelPhotoperiod × Tmin241.03267.57<0.001
Dehydrin,16 kD
Null model120.35
 1Photoperiod62.0958.25<0.001
 2Tmin83.9036.44<0.001
 3Photoperiod:Tmin86.1934.16<0.001
 4Photoperiod:Tmean100.2720.08<0.001
 5Tmean104.7515.60<0.001
 Full modelPhotoperiod × Tmin47.9272.42<0.001