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Related Experiment Videos

Simple rules guide dragonfly migration.

Martin Wikelski1, David Moskowitz, James S Adelman

  • 1Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA. wikelski@princeton.edu

Biology Letters
|December 7, 2006
PubMed
Summary
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Individual dragonflies migrate south using distinct stopover and migration days, similar to songbirds. Their migration is influenced by daytime, wind speed, and temperature, revealing general long-distance strategies.

Area of Science:

  • Entomology
  • Animal Behavior
  • Ecology

Background:

  • Billions of insects migrate annually, but individual migratory strategies remain poorly understood.
  • Previous research focused on population-level migratory phenomena, leaving gaps in knowledge about individual insect navigation and behavior.

Purpose of the Study:

  • To investigate the migratory destinations and strategies of individual insects.
  • To track the movement patterns and decision-making processes of dragonflies during autumn migration.

Main Methods:

  • Miniaturized radio transmitters (approx. 300 mg) were attached to 14 individual dragonflies (Anax junius).
  • Tracking was conducted for up to 12 days using receiver-equipped aircraft and ground teams.
  • Data on migration days, stopover periods, direction, speed, and environmental conditions were collected.

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Main Results:

  • Dragonflies exhibited distinct migration and stopover days, migrating every 2.9 days on average.
  • Average net advance was 58 km over 6.1 days, with a mean speed of 11.9 km/day, generally southward.
  • Migration occurred during daytime with wind speeds <25 km/h, but only after two nights of decreasing minimum temperatures.

Conclusions:

  • Dragonfly migratory patterns and decision rules resemble those of songbirds.
  • These findings suggest a general migration strategy applicable to long-distance migration in organisms with high self-propelled flight speeds.