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First published online March 9, 2004
Journal of Experimental Biology 207, 1273-1286 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.00888

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Stick insect locomotion in a complex environment: climbing over large gaps

Bettina Blaesing^* and Holk Cruse

Faculty of Biology, University of Bielefeld, Postbox 100131, D-33501 Bielefeld, Germany

^* Author for correspondence (e-mail: bettina.blaesing{at}uni-bielefeld.de)

Accepted 21 January 2004

In a complex environment, animals are challenged by various types of obstacles. This requires the controller of their walking system to be highly flexible. In this study, stick insects were presented with large gaps to cross in order to observe how locomotion can be adapted to challenging environmental situations. Different approaches were used to investigate the sequence of gap-crossing behaviour. A detailed video analysis revealed that gap-crossing behaviour resembles modified walking behaviour with additional step types. The walking sequence is interrupted by an interval of exploration, in which the insect probes the gap space with its antennae and front legs. When reaching the gap, loss of contact of an antenna with the ground does not elicit any observable reactions. In contrast, an initial front leg step into the gap that often follows antennal `non-contact' evokes slowing down of stance velocity. An ablation experiment showed that the far edge of the gap is detected by tactile antennal stimulation rather than by vision. Initial contact of an antenna or front leg with the far edge of the gap represents a `point of no return', after which gap crossing is always successfully completed. Finally, flow chart diagrams of the gap-crossing sequence were constructed based on an ethogram of single elements of behaviour. Comparing flow charts for two gap sizes revealed differences in the frequency and succession of these elements, especially during the first part of the sequence.

Key words: stick insect locomotion, hexapod walking, gap crossing, tactile orientation, exploration, ethogram, Aretaon asperrimus, Carausius morosus

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