Table 4: Comparison of pollen availability and pollen usage by Ceratina flavipes and Phenology of the total dry weight of pollen for each flowering species during the breeding season of C. flavipes. The number of flowers is shown in parentheses. Total pollen mass was calculated as $m×n$, where m is the average dry pollen weight per flower (from Table 3) and $n$ is the number of flowers. Availability and usage differed significantly among species.
 Number of pollen grants (Number of flower head) Flowering sp. Availability Using [83 balls] Availability Using [47 balls] Availability Using [8 balls] Availability Using [10 balls] 6/12-13 LL 6/18–20 ML 6/26-27 SL 6/30–7/1 E Vicia cracca 0.00 106 2351.70 (90) 5 9145.50 (350) 0 12542.40 (480) 1 Rosa rugosa 7227.09 (639) 9372 51256.92 (4532) 5602 44991.18 (3978) 981 6853.86 (606) 979 Rosa parvifolius 0.00 4666 371.58 (33) 2546 675.60 (60) 518 35941.92 (3192) 794 Melilotus suaveolens 0.00 0 0.00 0 1453.40 (215) 0 17778.80 (2630) 0 Picris hieracioides 0.00 73 972.36 (219) 55 1602.84 (361) 0 5772.00 (1300) 6 Lathyrus japonicus 4091.49 (1521) 90 13619.47 (5063) 41 4040.40 (1365) 0 515.04 (60) 0 Oenothera biennis 0.00 0 0.00 0 1.15 (1) 0 623.3 (542) 0 Calystegia soldanella 0.00 0 16.86 (2) 0 0.00 0 1.41 (8) 0 others 0.00 2293 2205.64 (759) 1151 0.00 101 111.18 (631) 220 $G$-test ${X}^{2}$ = 24017.79 ${X}^{2}$= 22632.59 ${X}^{2}$ = 11782.58 ${X}^{2}$ = 9979.381 $P<.01$ $P<.01$ $P<.01$ $P<.01$