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Figure 2. Effects of Pollinator Identity and Diversity on Plant Reproductive Success
The left panels show the effects of pollinator guild identity (S indicates syrphid flies, B indicates bumble bees)
on the reproductive success of the two plant guilds (open circle indicates open-flowers [group 1], closed circle
indicates tubular-flowers [group 2]). Reproductive success was measured by (A) the standardized number of
fruits per plant and (B) the standardized number of seeds per fruit. The right panels show the effects of the
functional diversity of pollination treatments (triangle), plant treatment (inverted triangle) and both (diamond)
on the standardized numbers of fruits per plant (C) and seeds per fruit (D). Lines connecting symbols indicate
significant effects (solid indicates p < 0.001, dashed indicates p < 0.08). Error bars represent one standard error.
See Table 1 for statistical analysis.
Table 1. Analysis of Plant Reproductive Success.
With respect to seed set per fruit, the interaction between plant and pollina-
tion treatment was marginally significant (Table 1, right). As with fruit produc-
tion, the contrasts A1 versus B1 and A2 versus B2 indicate that the two plant
functional groups responded differently to pollinator functional group identity.
The pattern, however, was different: Open flowers produced significantly fewer
seeds per fruit in the bumble bee treatment than in the syrphid treatment (Figure
2C). This means that bumblebees were less-efficient pollinators than syrphids
for open flowers. This could be due to the higher rate of geitonogamous visits
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