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Journal of Experimental Biology 61,219-227 (1974)
Published by Company of Biologists 1974

Metabolic Rates Related to Muscle Activity in Bumblebees

ANN E. KAMMER ¹ and BERND HEINRICH ²

¹ Division of Biology, Kansas State University, Manhattan, Kansas 66506
² Division of Entomological Sciences, University of California, Berkeley, California 94720

1. Oxygen consumption, thoracic temperature, and action potentials from the fibrillar muscles were concurrently recorded in queens and workers of Bombus vosnesenskii.

2. The oxygen consumption of ‘inactive’ bees (quiescent and/or producing fewer than 0.3 spikes/sec) was markedly temperature-sensitive, with a Q₁₀ of 3.4 for thoracic temperatures of 25-35 °C.

3. The oxygen consumption of bees with active fibrillar muscles was directly correlated with spike frequency; a single spike was associated with the consumption of 2.3-2.6 µl O₂/g_th. No oxygen debt was observed.

4. The oxygen consumption per spike during flight was similar to that during warm-up.

5. Oxygen consumption per gram thorax was similar in queens and workers engaging in similar activity.

6. The results are compared with those from other insects and their adaptive significance is discussed.

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