The relationships between pollen production and sugar concentration ( R 2 = .11, t = 2.62, p = .096), and pollen production and volume of nectar produced by flowers ( R 2 = .14, t = 2.04, p = .052), were also positive but only marginally significant (Figure 5 ). 3.5.
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An analysis of the energetic reward offered by field bean (<i>Vicia faba</i>) flowers: Nectar, pollen, and operative force.
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