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The Ingestion of Fluorescent, Magnetic Nanoparticles for Determining Fluid-uptake Abilities in Insects
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Can flower constancy in nectaring butterflies be explained by Darwin's interference hypothesis?

D Goulson1, Jane C Stout1, Sadie A Hawson1

  • 1University of Southampton, Department of Biology, Biomedical Sciences Building, Bassett Crescent East, Southampton SO16 7PX, UK, , , , , , GB.

Oecologia
|March 18, 2017
PubMed
Summary

Flower constancy in butterflies, where they stick to one flower type, may be explained by learning difficulties. This behavior helps butterflies save handling time, allowing more time for activities like mating.

Keywords:
ButterflyKey words Foraging efficiencyLearningMajoringReward

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Area of Science:

  • Ecology
  • Animal Behavior
  • Evolutionary Biology

Background:

  • Insects often display flower constancy, preferring previously visited flower species.
  • Darwin hypothesized this is due to learning interference, where handling skills for one species hinder recall for others.
  • The trade-off between handling time savings and increased travel time for flower constancy is not well-quantified.

Purpose of the Study:

  • To test Darwin's interference hypothesis for flower constancy in the butterfly Thymelicus flavus.
  • To quantify the trade-off between handling time and travel time in foraging butterflies.
  • To assess the role of handling time savings in enabling other activities.

Main Methods:

  • Measured handling and flight times of Thymelicus flavus under natural conditions.
  • Quantified flower species abundance and nectar reward.
  • Estimated foraging efficiency based on collected data.

Main Results:

  • Butterflies showed a mean increase of 0.85s in handling time per flower when switching species.
  • Switching flower species did not decrease, but rather increased, travelling time.
  • Butterflies were more likely to switch flowers after visiting a less rewarding one.

Conclusions:

  • Darwin's interference hypothesis remains a plausible explanation for flower constancy in butterflies.
  • Despite small handling time savings, flower constancy may be adaptive by freeing up time for other essential activities like mate location.
  • The behavior is influenced by nectar reward, with butterflies switching after low rewards.