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Trapline foraging by nectar-collecting hornets.

Mathilde Lacombrade1, Kristine Abenis1,2, Charlotte Doussot1

  • 1Research Center on Animal Cognition (CRCA), Center of Integrative Biology (CBI), CNRS, Toulouse University, Toulouse, France.

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Summary

Japanese yellow hornets exhibit trapline foraging, visiting artificial flowers in a repeatable sequence. This behavior expands our understanding of route learning and memory in nectar-foraging wasps.

Keywords:
Vespa simillimaArtificial flowersSpatial cognitionSpatial movement networksTraplining

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Area of Science:

  • Behavioral Ecology
  • Animal Cognition
  • Insect Behavior

Background:

  • Many animals, including bees, butterflies, birds, bats, and primates, use "traplines"—stable, repeatable sequences for visiting familiar food resources.
  • Trapline foraging demonstrates complex route learning and memory in various animal taxa.

Purpose of the Study:

  • To investigate the existence of trapline foraging behavior in wasps, specifically the Japanese yellow hornet (Vespa simillima).
  • To analyze the movement patterns and learning capabilities of hornets during foraging on artificial flower arrays.

Main Methods:

  • Individually marking wild Japanese yellow hornets.
  • Monitoring hornet movement patterns while they foraged on four artificial flowers within their home range.
  • Analyzing visitation sequences over thirty consecutive foraging bouts and using different flower array configurations.

Main Results:

  • All monitored hornets developed a consistent and repeatable sequence of flower visitation after repeated foraging bouts.
  • Hornet foraging efficiency increased with experience.
  • Hornets did not consistently choose the shortest path, often prioritizing nearest-neighbor movements over minimizing total travel distance.

Conclusions:

  • Japanese yellow hornets exhibit trapline foraging, similar to other known animal groups.
  • This finding broadens the scope of comparative research on multi-destination route learning and memory.
  • The study adds nectar-foraging wasps to the list of animals demonstrating sophisticated spatial memory and navigation strategies.