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First published online February 4, 2005
Journal of Experimental Biology 208, 707-719 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01434

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Walking on inclines: energetics of locomotion in the ant Camponotus

Alexandra Lipp, Harald Wolf and Fritz-Olaf Lehmann^*

Department of Neurobiology, University of Ulm, 89069 Ulm, Germany

^* Author for correspondence (e-mail: fritz.lehmann{at}biologie.uni-ulm.de)

Accepted 6 December 2004

To assess energetic costs during rest and locomotion in a small insect, we measured metabolic rate in freely moving ants Camponotus sp. (average body mass 11.9 mg). The animals ran in a straight respirometric chamber in which locomotor speed and CO₂ release were monitored simultaneously using flow-through respirometry and conventional video analysis. In resting intact ants, standard metabolic rate was on average 0.32 ml CO₂ g^-1 body mass h^-1. During walking, the ants breathed continuously and metabolic rate increased between 4.3 times (level walking at 0-5 mm s^-1) and 6.9 times (30° ascent at 85-95 mm s^-1) over resting rates. Metabolic rate increased linearly with increasing walking speed but superficially leveled off beyond speeds of about 70 mm s^-1. Walking on incline (uphill) or decline slopes (downhill) of up to 60° had only a small effect on energy consumption compared to level walking. During slope walking, total metabolic rate averaged over all running speeds ranged from a minimum of 1.55±0.4 (horizontal running) to a maximum of 1.89±0.7 ml CO₂ h^-1 g^-1 body mass (30° downhill). The mean cost of transport in Camponotus was approximately 130 J g^-1 km^-1. The metabolic requirements in the comparatively small insect Camponotus for walking were mostly in the range expected from data obtained from other insects and small poikilotherms, and from allometric scaling laws.

Key words: insect, ant, Camponotus sp., metabolic rate, locomotion, slope walking, respirometry

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