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Journal of Experimental Biology, Vol 192, Issue 1 119-127, Copyright © 1994 by Company of Biologists

JOURNAL ARTICLES

STEPPING PATTERNS IN ANTS - INFLUENCE OF LOAD

C Zollikofer

Stepping pattern geometry and walking kinematics of individual foragers of Cataglyphis fortis (Formicidae: Hymenoptera) were recorded during outward and homeward trips to and from a food source. While returning homewards, the animals were supplied with food items of defined mass (load ratio from 1.3 to 6.4) and volume. Under the influence of load, the temporal interleg coordination pattern was maintained (alternating tripod gait), but the spatial tripod pattern was modified. Tripod deformation was found to be proportional to the displacement of the centre of mass induced by the load. Stride length and stride frequency were not altered at any speed when animals carried loads compared with trips without a load. However, in order to maintain stability, mean stride length, mean speed and mean stride frequency were reduced while carrying loads.
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© The Company of Biologists Ltd 1994