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Table I

Distance values for the recorded foraging flights of Chelostoma florisomne. The direct minimum distance represents the distance to the closest host plant stand from each nesting site. The direct foraging distance (d) was calculated from the horizontal linear distance (h) between nesting site and place of recapture and the difference in altitude (a) applying the formula of Pythagoras (see text). The direct distance across forest represents the distance a bee had to fly over or through forest. All distance values are given in meters. Foraging flights nos. 9 and 10, nos. 16 and 20, as well as nos. 18 and 19 were by one female each.

Foraging Nesting Direct minimum Horizontal linear Difference Direct foraging Direct distance
flight site distance distance (h) in altitude (a) distance (d) across forest
1 B 180 250 55 260 170
2 B 180 260 55 270 200
3 B 180 300 55 310 170
4 D 340 360 10 360 150
5 B 180 370 5 370 270
6 B 180 360 65 370 200
7 A 310 360 80 380 140
8 D 340 390 10 390 160
9 D 340 390 10 390 160
10 D 340 390 10 390 160
11 D 340 390 10 390 150
12 A 310 390 80 410 140
13 C 460 500 110 510 210
14 D 340 560 45 560 450
15 D 340 570 45 570 480
16 C 460 560 135 580 290
17 C 460 560 135 580 290
18 C 460 560 135 580 290
19 C 460 560 135 580 290
20 C 460 560 135 580 290
21 C 460 650 30 650 0