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Tree frog attachment: mechanisms, challenges, and perspectives.

Julian K A Langowski1, Dimitra Dodou2, Marleen Kamperman3

  • 11Experimental Zoology Group, Department of Animal Sciences, Wageningen University & Research, De Elst 1, Wageningen, 6708 WD The Netherlands.

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|August 30, 2018
PubMed
Summary
This summary is machine-generated.

Tree frogs use specialized toe pads with mucus secretion for versatile adhesion. Their attachment mechanisms, involving capillary, hydrodynamic, and van der Waals forces, inspire new bio-adhesives.

Keywords:
Attachment organBioadhesionBiomimeticsBiotribologyCapillary adhesionDrainageLitoria caeruleaLubricationToe padvan der Waals

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Area of Science:

  • Biomechanics and Biomaterials Science
  • Adhesion Science
  • Amphibian Biology

Background:

  • Tree frogs exhibit remarkable adhesion to diverse surfaces, crucial for their arboreal lifestyle.
  • Attachment relies on specialized toe pads secreting mucus, necessitating efficient drainage and lubrication.

Purpose of the Study:

  • To provide an overview of tree frog attachment mechanisms.
  • To analyze the interplay of pad morphology, material properties, and environmental factors.
  • To discuss experimental data on adhesion and friction forces, proposing new research hypotheses.

Main Methods:

  • Review and synthesis of existing data on tree frog toe pad morphology and material.
  • Analysis of experimental findings on adhesion and friction forces in various conditions.
  • Discussion of ecological, phylogenetic, and functional demands influencing attachment.

Main Results:

  • Tree frog attachment involves a combination of capillary, hydrodynamic, mechanical interlocking, and van der Waals forces.
  • Pad morphology and hierarchical surface patterns enhance contact area and liquid drainage.
  • Existing models inadequately capture the complex contributions of these multiple adhesion mechanisms.

Conclusions:

  • The soft pad material and surface topography facilitate liquid drainage, promoting van der Waals forces.
  • Understanding tree frog adhesion offers insights into other biological systems and bio-inspired adhesives.
  • Further research is needed to refine analytical models and fully elucidate attachment mechanisms.