This difference was highly significant at the frame level, where the singles collected more pollen per day per frame of bees than did the doubles in both years (singles: 2.14 ± 0.38 g [2014], 2.57 ± 0.30 g [2015]; doubles 0.79 ± 0.12 g [2014], 1.18 ± 0.24 g [2015]; Table 2 ; Fig. 2B ).
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Comparison of Honey Bee (Hymenoptera: Apidae) Colony Units of Different Sizes as Pollinators of Hybrid Seed Canola.
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