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Fig. 14.1. The relationships between the number of flower heads on a Cirsium purpuratum plant and (A) the relative bumble bee visitation rate per plant (y = 0.612[i -exp(-0.i48x)], n = 57, R2 = 0.637, P <0.0001), and (B) the number of flower heads probed by a bee per plant (y = 1.117 + 0.051*, n = 57, R2 = 0.533, p <0.0001), obtained from six 1-day observations for 9-13 plants. Relative visitation rate per plant (y axis of 1A) is calculated as [(number of bee visits to the focal plant)/(total number of bee visits to the observed plants)] for each of six 1-day observations. (Adapted from Ohashi & Yahara 1998.)

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