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External power amplification drives prey capture in a spider web.

S I Han1, H C Astley2, D D Maksuta2

  • 1Department of Biology, Integrated Bioscience Program, The University of Akron, Akron, OH 44325 sih12@zips.uakron.edu.

Proceedings of the National Academy of Sciences of the United States of America
|May 16, 2019
PubMed
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The triangle-weaver spider uses its web as an external tool for power amplification, storing energy in silk threads over multiple muscle contractions to capture prey with high acceleration.

Keywords:
elastic energypower amplificationprey capturespider silk propertiestool use

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Area of Science:

  • Biomechanics
  • Animal behavior
  • Materials science

Background:

  • Power amplification in animals enables movements beyond muscle limits.
  • Existing nonhuman power amplification relies on single muscle contraction energy storage.
  • The triangle-weaver spider (Hyptiotes cavatus) presents a novel case of external power amplification.

Purpose of the Study:

  • To investigate the mechanics of the triangle-weaver spider's web for prey capture.
  • To explore the concept of external power amplification using a biological system.
  • To compare the spider's web-based power amplification with internal, muscle-driven systems.

Main Methods:

  • Observation of Hyptiotes cavatus web construction and prey capture.
  • Analysis of the mechanical principles of energy storage and release in the spider web.
  • Comparison of the spider's power amplification strategy with known biological and engineered systems.

Main Results:

  • Hyptiotes cavatus stores energy in silk threads over multiple limb movements.
  • The spider's web springs forward with high acceleration (up to 772.85 m/s^2) upon prey impact.
  • This external system allows for greater energy release than internal muscle-driven systems.

Conclusions:

  • Spider webs function as engineered, power-amplifying tools, storing elastic energy.
  • This strategy offers mechanical advantages over internal elastic-energy systems.
  • The spider's web demonstrates convergent evolution with human-engineered power-amplifying devices.