Adhesion of dry and wet electrostatic capture silk of uloborid spiderReportar como inadecuado

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* Corresponding author 1 DALEMBERT - Institut Jean Le Rond d-Alembert 2 Department of Zoology Oxford

Abstract : We demonstrate the impressive adhesive qualities of uloborid spider orb-web capture when dry, which are lost when the nano-filament threads are wetted. A force sensor with a 50 nN–1 mN detection sensitively allowed us to measure quantitatively the stress–strain characteristics of native silk threads in both the original dry state and after wetting by controlled application of water mist with droplet sizes ranging between 3 and 5 μm and densities ranging between 104 and 105 per mm3. Stress forces of between 1 and 5 μN-μm2 in the native, dry multifilament thread puffs were reduced to between 0.1 and 0.5 μN-μm2 in the wetted collapsed state, with strain displacements reducing from between 2 and 5 mm in the dry to 0.10–0.12 mm in the wetted states. We conclude that wetting cribellate threads reduce their van der Waals adhesion with implications on the thread’s adhesive strength under tension. This should be considered when discussing the evolutionary transitions of capture silks from the ancestral dry-state nano-filaments of the cribellate spider taxa to the wet-state glue-droplets of the ecribellate taxa.

Keywords : spider web adhesion evolution prey capture

Autor: Hervé Elettro - Sébastien Neukirch - Arnaud Antkowiak - Fritz Vollrath -



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