. The Canadian field-naturalist. 1989 Young and Owen: Foraging of Bumble Bee Workers 345 Table 4. Radial-cell lengths of the three predominant species of bumble bees found in the meadow. n Radial-cell length (mm) Bombus species x Range mix t us sylvicola melanopygus 18 9 6 + + ± - observed value of r () barely exceeds the critical value of ra05(2), 66 = Discussion Of the variables examined, temperature was the most important factor influencing the foraging activity of the worker bumble bees in the subalpine meadow.
. The Canadian field-naturalist. 1989 Young and Owen: Foraging of Bumble Bee Workers 345 Table 4. Radial-cell lengths of the three predominant species of bumble bees found in the meadow. n Radial-cell length (mm) Bombus species x Range mix t us sylvicola melanopygus 18 9 6 + + ± - observed value of r () barely exceeds the critical value of ra05(2), 66 = Discussion Of the variables examined, temperature was the most important factor influencing the foraging activity of the worker bumble bees in the subalpine meadow. This corresponds with the results of other studies at low elevations (Heinrich and Heinrich 1983), alpine (Lundberg 1980) and arctic (Richards 1973) sites. Perhaps the most interesting result is that we confirmed a prediction that species of different body sizes showed significantly different dependence on temperature for foraging activity. Bees of small body size are expected to be '//A 35 30 25 20 15 10 5 I I 20 W//A V/. '///, 15 10 5 i-n i 1500 1600 1700 1800 1900 2000 2100 2200 2300 Time of Day F igure 2. Foraging activity of bumble bee workers on 16 July (top) and 22 July (bottom). Activity ceased during heavy rain (represented by stippling) but continued during light rain showers (cross hatching).. 10 15 20 Ambient Temperature CO 25. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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