Statistics of the piecewise polynomial models (Eq. (2)) between nectar sugar concentration in the floret and air humidity, approximated either by the relative drought or by the vapour pressure deficit.
|Model||k||Parameter values ± 95% CI||R2D||AIC||Model rank||ΔAIC|
|Relative drought||4||28.1 ± 1.0||17.1 ± 2.8||55.7 ± 0.4||0.552||31,485||2||274|
|Vapour pressure deficit||4||0.750 ± 0.033||23.2 ± 2.3||55.6 ± 0.4||0.556||31,211||1||0|
k: number of estimated parameters per model; CI: confidence interval; R2D: coefficient of determination calculated by the deviance ratio; model rank: model ranking by increasing AIC value; ΔAIC: AIC value minus the lowest AIC; d0: drought level at which the sugar concentration reaches cmax; c0: intercept; cmax: maximum sugar concentration beyond which nectar water can no longer evaporates. The model in bold is the one with the minimum AIC value.
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