Table 2.

Equations of non-linear regressions for the water temperature and the temperature of thorax (T_th), head (T_hd) and abdomen (T_ab) of honeybees during water foraging in dependence on ambient temperature (T_a) and solar radiation (Fig. 3). Thorax: Eq. (1), head and abdomen: Eq. (2); R² = coefficient of regression, N = number of foraging stays.

Part	Radiation	Equations	R2	N
Thorax	0–1200	$T_{\text{th}}=37.91275+0.24936\times T_{\text{a}}-0.03005\times T_{\text{a}}^2+0.00075\times T_{\text{a}}^3$	0.28692	879
	<200	$T_{\text{th}}=35.47562+0.43907\times T_{\text{a}}-0.03330\times T_{\text{a}}^2+0.00068\times T_{\text{a}}^3$	0.12903	226
	200–500	$T_{\text{th}}=35.75677+0.79598\times T_{\text{a}}-0.07207\times T_{\text{a}}^2+0.00167\times T_{\text{a}}^3$	0.41394	414
	>500	$T_{\text{th}}=41.98211-0.14479\times T_{\text{a}}-0.01516\times T_{\text{a}}^2+0.00056\times T_{\text{a}}^3$	0.81774	239
Head	0–1200	Thd = 24.66888 + (22.82587/(1 + e3.38148−0.11099 × Ta))	0.75303	879
Abdomen	0–1200	Tab = 7.84585 + (43.38589/(1 + e1.54937−0.07062 × Ta))	0.85623	879
Water	0–1200	Twt = 3.67262 + (29.33682/(1 + e2.74058−0.15550 × Ta))	0.92742	4957