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Slide 19 of 21
Early season nests were provisioned when flower standing crop is high, whereas late season nests were provisioned when standing crop was low. A number of variables relating to cells and nests are likely to be affected by flower resources. Number of cells per nest decreased significantly in all fields late in the season, as did percent of the nests that were incomplete, i.e., they had no nest cap, suggesting that they were abandoned before they could be completed. Pollen balls, which could be affected by nectar availability, and chalkbrood, which may be related to pollen quality, both decreased in 5 of the 7 fields studied.