Fig. 2

Transpiration (average in mm day⁻¹ m⁻² LA, n = 8) for the three sessions at 100 % REW under a 70 % and b 20 % incident radiation for the four species studied (black squares C. vulgaris, dark grey diamonds P. aquilinum, grey circles Rubus sect. Fruticosi, light grey triangles M. caerulea). Performances of the models are expressed by r ² and P value: *** < 0.001, ** < 0.01, * < 0.05