Figure 1 - model (as MS powerpoint file)

Figure 1. Factors that might affect evaporation of water from nectar. (A) Flower nectar depth (nectar is hidden in long-tubed flowers), (B) hydrolyis of sucrose by invertase into hexoses (increase in osmolality), (C) Relation between activity time of flowers (diurnal vs. nocturnal) and temperature (higher during the day) and humidity (higher during the night), (D) features of the anthophore (an elongated internodium above the calyx found in some Caryophylloideae) like its length and hairs. Note: While for hypotheses (A) and (B) evidence can be found in the literature (see text), (C & D) has been tested in this study.