. The Canadian field-naturalist. 10 15 20 Ambient Temperature CO 25. Ambient Temperature CO Figure 3. Relationship between number of bumble bee workers foraging and ambient temperature for the data pooled over all study days. A: B. mixtus. The regression equation is Number = + Temperature (°C) (F = , P< ). B: B. melanopygus and B. sylvicola (data for both species pooled); the regression equation is: Number = + Temperature (°C) (F= , P< ). influenced by ambient temperature to a greater extent than those of larger size, because of a greater cost o
. The Canadian field-naturalist. 10 15 20 Ambient Temperature CO 25. Ambient Temperature CO Figure 3. Relationship between number of bumble bee workers foraging and ambient temperature for the data pooled over all study days. A: B. mixtus. The regression equation is Number = + Temperature (°C) (F = , P< ). B: B. melanopygus and B. sylvicola (data for both species pooled); the regression equation is: Number = + Temperature (°C) (F= , P< ). influenced by ambient temperature to a greater extent than those of larger size, because of a greater cost of foraging at low temperatures. Workers of B. mixtus were significantly smaller than those of B. melanopygus and B. sylvicola, and showed a significantly greater dependence on temperature for foraging activity. Although nectar production by Yellow Hedysa- rum was variable, the average concentration of sugar and quantity were generally high (Table 1), and there was no indication that nectar resources were limiting for the bumble bees at that time of the season. However, sugar concentration was strongly influenced by ambient humidity, which in turn depended upon temperature. This resulted in a positive correlation between concentration and temperature. The foraging activity of B. mixtus workers was correlated with neither sugar concentration nor. 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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