PMID: 11324338Apr 28, 2001Paper

Behavioural and physical reactions of the Colorado potato beetle, Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae) walking on a slanted surface

Biological cybernetics
Y Pelletier, R Caissie

Abstract

A natural reaction of the adult Colorado potato beetle [Leptinotarsa decemlineata (Say)] is to walk uphill on sloped surfaces. The geotaxis reaction of the beetle was observed on slopes of 20 degrees or steeper. It was demonstrated that the uphill orientation behaviour was not a consequence of physical limitation for across-slope locomotion. The walking speed of insects deviating from the fall line did not change within the range of slope angles tested. The speed of adult beetles decreased with an increase in the slope of the substrate as a reaction to the increased gravitational force vector opposing uphill movement. The larger size of the hind legs might make uphill locomotion more efficient than traversing a sloped surface. As the angle of the slope increased, the gait changed from a 3/3 to a 5/1, as did the posterior and anterior extreme position of the legs. This behaviour might be triggered by the need to maintain balance on slanted surfaces as the vertical projection of the centre of mass on the substrate moved outside the support base pattern at the steeper angles. In one experiment beetles were made to pull a load when walking over a horizontal surface. The loads pulled were equivalent to the gravitational loads opposi...Continue Reading

Citations

Jun 4, 2008·Frontiers in Zoology·Tobias Seidl, Rüdiger Wehner
Sep 8, 2017·Frontiers in Neurorobotics·Shinya AoiFlorentin Wörgötter
Nov 12, 2003·The Journal of Experimental Biology·A L RidgelP L Schaefer
Jul 21, 2009·The Journal of Experimental Biology·Lars ReinhardtReinhard Blickhan
Apr 20, 2014·The Journal of Experimental Biology·Lars Reinhardt, Reinhard Blickhan
Dec 28, 2004·Ageing Research Reviews·Angela L Ridgel, Roy E Ritzmann

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