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Migration00:53

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Building an Enhanced Flight Mill for the Study of Tethered Insect Flight
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Published on: March 10, 2021

Wind selection and drift compensation optimize migratory pathways in a high-flying moth.

Jason W Chapman1, Don R Reynolds, Henrik Mouritsen

  • 1Plant and Invertebrate Ecology Department, Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, United Kingdom. jason.chapman@bbsrc.ac.uk

Current Biology : CB
|April 9, 2008
PubMed
Summary

Nocturnal moths actively control their migratory paths, not just drift with the wind. They use high-altitude winds and a compass to navigate towards favorable overwintering grounds.

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Area of Science:

  • Entomology
  • Animal Behavior
  • Aerospace Biology

Background:

  • Many insects migrate seasonally using high-altitude winds for long-distance travel.
  • This windborne migration often leads to unpredictable displacement, raising questions about directional control.

Purpose of the Study:

  • To investigate the navigational mechanisms of nocturnal migratory moths.
  • To determine if moths actively control their flight paths or are passively transported by wind.

Main Methods:

  • Utilized entomological radar to track free-flying migratory noctuid moths (Autographa gamma).
  • Analyzed flight paths in relation to wind speed, direction, and moth orientation.

Main Results:

  • Moths actively select favorable high-altitude windstreams for migration.
  • They orient near the downwind direction to maximize travel distance.
  • Moths compensate for cross-wind drift to ensure arrival at overwintering sites.

Conclusions:

  • Nocturnally migrating moths possess complex behaviors for directional control.
  • They utilize an inherited directional preference and a compass to optimize migratory tracks.