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)

  • Pablo Perez Goodwyn
  • Andrei Peressadko
  • Heinz Schwarz
  • Victoria Kastner
  • Stanislav Gorb
Original Paper

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

Cuticle Ultrastructure Mechanical properties Adhesion Attachment 

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Pablo Perez Goodwyn
    • 1
    • 3
  • Andrei Peressadko
    • 1
    • 4
  • Heinz Schwarz
    • 2
  • Victoria Kastner
    • 2
  • Stanislav Gorb
    • 1
    • 2
  1. 1.Evolutionary Biomaterials Group, Department ArztMax Planck Institute for Metals ResearchStuttgartGermany
  2. 2.Max Planck Institut für EntwicklungsbiologieTubingenGermany
  3. 3.Laboratory of Insect Ecology, Graduate School of AgricultureKyoto UniversityKyotoJapan
  4. 4.Nanotribology Laboratory for Information Storage and MEMS/NEMS(NLIM)Ohio State UniversityColumbusUSA

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