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Table 1

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
    d0 c0 cmax        
Null 2         54,574 3 23,363
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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