Journal of Comparative Physiology A

, Volume 192, Issue 11, pp 1233–1243

Material structure, stiffness, and adhesion: why attachment pads of the grasshopper (Tettigonia viridissima) adhere more strongly than those of the locust (Locusta migratoria) (Insecta: Orthoptera)

Authors

  • Pablo Perez Goodwyn
    • Evolutionary Biomaterials Group, Department ArztMax Planck Institute for Metals Research
    • Laboratory of Insect Ecology, Graduate School of AgricultureKyoto University
  • Andrei Peressadko
    • Evolutionary Biomaterials Group, Department ArztMax Planck Institute for Metals Research
    • Nanotribology Laboratory for Information Storage and MEMS/NEMS(NLIM)Ohio State University
  • Heinz Schwarz
    • Max Planck Institut für Entwicklungsbiologie
  • Victoria Kastner
    • Max Planck Institut für Entwicklungsbiologie
    • Evolutionary Biomaterials Group, Department ArztMax Planck Institute for Metals Research
    • Max Planck Institut für Entwicklungsbiologie
Original Paper

DOI: 10.1007/s00359-006-0156-z

Cite this article as:
Perez Goodwyn, P., Peressadko, A., Schwarz, H. et al. J Comp Physiol A (2006) 192: 1233. doi:10.1007/s00359-006-0156-z

Abstract

The morphology, ultrastrucure, effective elastic modulus, and adhesive properties of two different smooth-type attachment pads were studied in two orthopteran species. Tettigonia viridissima (Ensifera) and Locusta migratoria (Caelifera) have a similar structural organization of their attachment pads. They both possess a flexible exocuticle, where the cuticular fibrils are fused into relatively large rods oriented at an angle to the surface. The compliant material of the pad contributes to the contact formation with the substrate. However, the pad material structure was found to be different in these two species. L. migratoria pads bear a thick sub-superficial layer, as well as a higher density of rods. The indentation experiments showed a higher effective elastic modulus and a lower work of adhesion for L. migratoria pads. When the indentations were made at different depths, a higher effective elastic modulus was revealed at lower indentation depths in both species. This effect is explained by the higher stiffness of the superficial pad layer. The obtained results demonstrate a clear correlation between density of the fibres, thickness of the superficial layer, compliance of the pad, and its adhesive properties. Such material structures and properties may be dependent on the preferred environment of each species.

Keywords

CuticleUltrastructureMechanical propertiesAdhesionAttachment

Copyright information

© Springer-Verlag 2006