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First published online October 10, 2003
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van der Waals and hygroscopic forces of adhesion generated by spider capture threads

Anya C. Hawthorn1 and Brent D. Opell2,*

1 College of Veterinary Medicine, Virginia Tech, Blacksburg, VA 24061, USA
2 Department of Biology, Virginia Tech, Blacksburg, VA 24061, USA



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  		Fig. 1. (A) Cribellar thread of Hyptiotes cavatus (scale bar, 150 µm). (B) Cylindrical cribellar fibrils of Hypochilus pococki (scale bar, 400 nm). (C) Noded fibrils of Hyptiotes cavatus (scale bar, 200 nm).

 


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  		Fig. 2. Diagram of a contact plate that is attached to a needle and is being pulled from a cribellar thread held at either end by supports. Force is concentrated on bands of cribellar fibrils (hatched areas) at the two edges of the plate.

 


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  		Fig. 3. Diagram of the band of contact (outlined by a dark rectangle) between a cribellar thread and the lower edge of the plate on the stickiness meter (Fig. 2), showing how the points of contact (closely spaced points on non-noded fibrils or the nodes of noded fibrils) were modeled.

 


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  		Fig. 4. Comparison of measured and modeled stickiness under high and low relative humidity (RH). Error bars of measured stickiness values represent ± 1 S.D.

 




© The Company of Biologists Ltd 2003