Table 2.

Equations of linear and non-linear regressions for the temperature of the thorax (T_th), head (T_hd), and abdomen (T_ab) of honeybees foraging on flowers or foraging for water (^*, Kovac et al., 2010), and of the blossom temperature, in dependence on ambient temperature (T_a) and solar radiation (Fig. 3).

Body part	Radiation (W m−2)	Equations	R2	P	N
		Bees on flowers
Thorax	0–1400	Tth = 10.15733 + 29.83926 × 0.98433Ta + 0.05332 × 1.19123Ta	0.16185	—	12685
	<200		0.20651	—	38
	—	Tth = 33.67525 + 0.00041 ×Ta	0.00000	>0.05	38
	200–500		0.18030	—	34
	—	Tth = 30.22421 + 0.21173 ×Ta	0.10899	>0.05	34
	>500		0.48709	—	40
	—	Tth = 28.90354 + 0.30973 ×Ta	0.26565	<0.001	40
Head	0–1400	Thd = 18.00959 + 0.58012 ×Ta	0.41795	<0.0001	12503
	<200	Thd = 18.32716 + 0.47753 ×Ta	0.59942	<0.0001	38
	200–500	Thd = 16.13789 + 0.64590 ×Ta	0.72383	<0.0001	34
	>500	Thd = 17.69125 + 0.66659 ×Ta	0.72718	<0.0001	40
Abdomen	0–1400	Tab = 5.56068 + 0.96864 ×Ta	0.64091	<0.0001	12645
	<200	Tab = 5.71561 + 0.87379 ×Ta	0.87821	<0.0001	38
	200–500	Tab = 4.54687 + 0.99761 ×Ta	0.82406	<0.0001	34
	>500	Tab = 7.57345 + 0.97364 ×Ta	0.76073	<0.0001	40
		Bees foraging water*
Thorax	0–1200	Tth = −10.25678 + 1.68281 × 1.06859Ta + 50.40771 × 0.98906Ta	0.18480	—	11340
Head	0–1200	Thd = 21.86636 + 0.42776 ×Ta	0.59319	<0.0001	11290
Abdomen	0–1200	Tab = 14.22541 + 0.70079 ×Ta	0.81478	<0.0001	11334
		Blossom surface temperature
	0–1200	Tbl = 3.39642 + 0.94273 ×Ta	0.60852	<0.0001	11340
	<200	Tbl = 2.19283 + 0.91810 ×Ta	0.87219	<0.0001	38
	200–500	Tbl = 3.30773 + 0.92522 ×Ta	0.73901	<0.0001	34
	>500	Tbl = 4.05296 + 0.98745 ×Ta	0.64128	<0.0001	40

R² = squared correlation coefficient, P = probability, N = means per flower and day (<50) or number of measurements.