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Spiders in space-orb-web-related behaviour in zero gravity.

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Area of Science:

  • Zoology
  • Biophysics
  • Space Biology

Background:

  • Gravity significantly influences organismal development and behavior.
  • Web-building spiders like Trichonephila clavipes exhibit gravity-dependent behaviors in web construction and posture.

Purpose of the Study:

  • To investigate the role of gravity in web building and spider orientation.
  • To observe spider behavior in a microgravity environment using the International Space Station.

Main Methods:

  • Two juvenile Trichonephila clavipes spiders were studied on the International Space Station for two months.
  • Control spiders were observed under identical conditions on Earth.
  • Webs and spider positions were photographed every 5 minutes.

Main Results:

  • Spiders in zero gravity built predominantly symmetrical webs, unlike the asymmetric webs built on Earth.
  • Web symmetry was influenced by light conditions: webs were more asymmetric when lights were on.
  • Spiders oriented randomly in darkness but faced away from light when it was present.

Conclusions:

  • Light direction can act as a primary orientation cue for spiders in the absence of gravity.
  • Gravity's influence on web asymmetry and spider orientation is significant.
  • Space-based research provides unique insights into fundamental biological processes.