Abstract
1. 1. At ambient temperatures <26°C, 2-deoxy- d-glucose injected into the thorax of Bombus affinis in vivo selectively prevented the ability to fly and inhibited both flight muscle glycolysis and substrate cycling of fructose 6-phosphate. 2. 2. The effect of 2-deoxy- d-glucose was specific; flying ability was not affected by 2-deoxy- d-galactose, d-glucose, d-fructose, l-arabinose, d-glucosamine-HCl or d- manno heptulose. 3. 3. Evidence is presented that 2-deoxy- d-glucose inhibits glucose entry into the flight muscle thereby interrupting substrate cycling of fructose 6-phosphate and glycolysis, both of which may be required for pre-flight heat production in bees at low ambient temperatures.
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