Table 1.
Summary of pollen nutritional quality collected by Bombus impatiens colonies by habitat over time and reproductive success
| Pollen nutritional content | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Protein (μg/mg pollen) | Lipid (μg/mg pollen) | Sugar (μg/mg pollen) | Protein:Lipid Ratio | |||||||||
| N | Mean | SE | N | Mean | SE | N | Mean | SE | N | Mean | SE | |
| Habitat | ||||||||||||
| Forest | 45 | 181.86 | 15.46 | 45 | 57.65 | 4.34 | 45 | 380.21 | 18.73 | 45 | 3.72 | 0.43 |
| Edge | 100 | 192.74 | 9.39 | 99 | 53.42 | 1.40 | 99 | 395.62 | 13.45 | 99 | 4.00 | 0.26 |
| Valley | 156 | 213.31 | 6.50 | 153 | 55.15 | 1.54 | 154 | 362.94 | 10.21 | 153 | 4.27 | 0.17 |
| H: F 2,291 = 6.7; p = .61 | H: F 2,287 = 1.2; p = .35 | H: F 2,288 = 1.3; p = .44 | H: F 1,287 = 0.59; p = .580 | |||||||||
| *T: F 1,291 = 33; p < .01 | T: F 1,287 = 4.4; p = .15 | T: F 1,288 = 1.9; p = .33 | *T: F 1,287 = 42; p < .01 | |||||||||
| Reproduction | ||||||||||||
| Unsuccessful | 120 | 187.52 | 8.59 | 120 | 53.17 | 1.74 | 120 | 358.17 | 10.64 | 120 | 3.97 | 0.23 |
| Successful | 181 | 211.22 | 6.36 | 177 | 56.16 | 1.48 | 178 | 388.70 | 10.22 | 177 | 4.18 | 0.17 |
| F 1,20 = 0.5; p = .49 | F 1,20 = 0.03; p = .90 | F 1,20 = 2.7; p = .12 | F 1,20 = 0.6; p = .45 | |||||||||
Note that nutritional values did not differ significantly between habitats and reproductive status; yet protein and P:L values did differ by week (see Figure 2b). For pollen nutrition, F and p values are provided for habitat (H) and time3 (T). Significant differences (p < .05) denoted by asterisks (*) in pollen nutrition were verified with False Discovery Rate for multiple testing. For reproductive success, actual distributions of all pollen loads from corbiculae are shown, but ANOVA analyzed by colony average nutrient concentrations of collected pollen.