Naturwissenschaften

, Volume 100, Issue 12, pp 1163–1169 | Cite as

Consequences of electrical conductivity in an orb spider's capture web

Original Paper

Abstract

The glue-coated and wet capture spiral of the orb web of the garden cross spider Araneus diadematus is suspended between the dry silk radial and web frame threads. Here, we experimentally demonstrate that the capture spiral is electrically conductive because of necks of liquid connecting the droplets even if the thread is stretched. We examine how this conductivity of the capture spiral may lead to entrapment of charged airborne particles such as pollen, spray droplets and even insects. We further describe and model how the conducting spiral will also locally distort the Earth's ambient electric field. Finally, we examine the hypothesis that such distortion could be used by potential prey to detect the presence of a web but conclude that any effect would probably be too small to allow an insect to take evasive action.

Keywords

Silk Electrostatic charges Airborne particles Aerosol Earth electric field 

Supplementary material

Supplementary Materials Figure 1

Legend: A section of Araneus diadematus capture thread is observed under a microscope seconds after it has been deposited in the web under RH of 55 %. The thread shows the swelling of the coating followed rapidly by the formation of individual droplets evenly spaced. (MP4 43026 kb)

Supplementary Materials Figure 2

Legend : Film showing the distortion of an orb web of Araneus diadematus by a metallic sphere of radius 5 mm charged to a voltage of 5 kV. In (a) the Voltage is positive and in (b) it is negative demonstrating that the neutral but electricity-conducting web is equally attracted to the charged sphere in both cases. (MP4 64550 kb)

References

  1. Bleaney BL, Bleaney B (1989) Electricity and magnetism. 3rd edn. Oxford University Press, Oxford, pp 18–20 and 48–51Google Scholar
  2. Clarke D, Whitney H, Sutton G, Robert D (2013) Detection and learning of floral fields by bumblebees. Science 340:66–69PubMedCrossRefGoogle Scholar
  3. Dyer SA (2004) Wiley survey of instrumentation and measurement. Wiley, New YorkGoogle Scholar
  4. Edmonds DT, Vollrath F (1992) The contribution of atmospheric water vapour to the formation and efficiency of a spider's capture web. Proc R Soc Lond B 248:145–148CrossRefGoogle Scholar
  5. Es'kov EK, Sapozhnikov AM (1976) Mechanisms of generation and perception of electric fields by honey bees. Biofizika 21:1097–1102PubMedGoogle Scholar
  6. Feynman RP, Leighton RB, Sands M (2013) The Feynman lectures on physics, desktop edition volume II: the new millennium edition. Basic Books, New YorkGoogle Scholar
  7. Gott JP (1933) On the electric charge collected by water drops falling through ionized air in a vertical electric field. Proc R Soc Lond Ser A 142:248–268CrossRefGoogle Scholar
  8. Greggers U, Koch G, Schmidt V, Dürr A, Floriou-Servou A, Piepenbrock D, Göpfert M, Menzel R (2013) Reception and learning of electric fields by bees. Proc R Soc B 280:20130528. doi:10.1098/rspb.2013.0528 PubMedCrossRefGoogle Scholar
  9. Jaworek A, Adamiak K, Krupa A (1998) 3D model for trajectories of airborne particles near a charged spherical collector. pp 1–8, 3rd international conference on multiphase flow, ICMF-98 Lyon, June 8–12, 1998Google Scholar
  10. Köhler T, Vollrath F (1995) Thread biomechanics in the two orb weaving spiders Araneus diadematus (Araneae, Araneidae) and Uloborus walckenaerius (Araneae, Uloboridae). J Exp Zool 271:1–17CrossRefGoogle Scholar
  11. Opell BD, Markley BJ, Hannum CD, Hendricks ML (2008) The contribution of axial fiber extensibility to the adhesion of viscous capture, threads spun by orb-weaving spiders. J Exp Biol 211:2243–2251PubMedCrossRefGoogle Scholar
  12. Opell BD, Tran AM, Karinshak SE (2011) Adhesive compatibility of cribellar and viscous prey capture threads and its implication for the evolution of orb-weaving, spiders. J Exp Zool 315:376–384CrossRefGoogle Scholar
  13. Opell BD, Karinshak SE, Sigler MA (2011) Humidity affects the extensibility of an orb-weaving spider’s viscous thread droplets. J Exp Biology 214:2988–2993Google Scholar
  14. Ortega-Jimenez VM, Dudley R (2013) Spiderweb deformation induced by electrostatically charged insects. Sci Rep 3:2108. doi:10.1038/srep02108 PubMedCentralPubMedCrossRefGoogle Scholar
  15. Rachold V, Heinrichs H (1992) Spinnweben: Natürliche Fänger atmospherisch transportierter Feinstäube. Naturwissenschaften 79:175–178CrossRefGoogle Scholar
  16. Richens DT (1997) The chemistry of aqua ions. Wiley, New YorkGoogle Scholar
  17. Samu F, Matthews GA, Lake D, Vollrath F (1992) Spider webs are efficient collectors of agrochemical spray. Pestic Sci 36:47–51CrossRefGoogle Scholar
  18. Smythe WR (1989) Static and dynamic electricity, 3rd edn. Hemisphere, New York, pp 172–179Google Scholar
  19. Vollrath F, Edmonds DT (1989) Modulation of the mechanical properties of spider silk by coating with water. Nature 340:305–307CrossRefGoogle Scholar
  20. Vollrath F, Tillinghast E (1991) Glycoprotein glue beneath a spider web's aqueous coat. Naturwissenschaften 78:557–559CrossRefGoogle Scholar
  21. Vollrath F, Fairbrother WJ, Williams RJP, Tillinghast EK, Bernstein DT, Gallager KS, Townley MA (1990) Compounds in the droplets of the orb spider's viscid spiral. Nature 345:526–528CrossRefGoogle Scholar
  22. Wan H, Wei G, Cui Y, Chen Y (2012) Influence factor analysis of atmospheric electric field monitoring near ground under different weather conditions, 7th international conference on applied electrostatics (ICAES-2012), Journal of Physics: Conference Series, 418, (2013) 012029, IOP PublishingGoogle Scholar
  23. Warnke U (1976) Effects of electric charges on honey bees. Bee World 57(2):1–56Google Scholar
  24. Xiao-li S, Yu P, Hose GC, Jian C, Feng-xiang L (2006) Spider webs as indicators of heavy metal pollution in air. Environ Contam Toxicol 76:271–277Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Department of ZoologyOxfordUK
  2. 2.The Clarendon LaboratoryOxfordUK

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