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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