3.1 Observations of flower pollinator visit behavior
Time of pollinarium bending was significantly higher than the total time of pollinator flight between two flowers on a plant (U = 0.000, W = 105, p < 0.01) and that of pollinator stay per visit (U = 3, W = 1833, p < 0.01) (Figure 1A). However, it was significantly lower than the time of pollinator stay per visit under the condition of nectar addition (U = 17, W = 122, p< 0.01) (Figure 1A). The differences in visit behavior, such as total time of pollinator stay per visit (U = 0.000, W = 1953, p < 0.01), rate of flowers visited to total number of flowers (U = 0.5, W = 21.5, p < 0.01) and time of pollinator stay on a single flower (U = 6.5, W = 502.5, p<0.01), showed significant differences between nectar addition and natural conditions (Figure 1A, B).