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Obstacle avoidance in bumblebees is robust to changes in light intensity.

Emily Baird1

  • 1Department of Zoology, Stockholm University, Stockholm, Sweden. emily.baird@zoologi.su.se.

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Bumblebees effectively avoid obstacles in dim light by slowing their approach, suggesting a time-to-contact strategy for safe foraging. This visual adaptation ensures flight safety during dawn and dusk.

Keywords:
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Area of Science:

  • Entomology
  • Animal Behavior
  • Sensory Ecology

Background:

  • Bumblebees forage at dawn and dusk, requiring safe flight in low light conditions.
  • Their visual system, adapted for bright light, has reduced motion detection in dim light.
  • Obstacle avoidance is critical for foraging, necessitating reliable detection and timely path adjustments.

Purpose of the Study:

  • To investigate bumblebee obstacle avoidance strategies in varying light conditions.
  • To determine if visual limitations in dim light affect flight safety during obstacle encounters.
  • To explore the potential role of time-to-contact prediction in bumblebee navigation.

Main Methods:

  • Bumblebees were observed flying towards a 5 cm diameter obstacle in both bright and dim light conditions.
  • Flight paths and avoidance distances were recorded.
  • Approach speeds and distances were analyzed in relation to light intensity.

Main Results:

  • Bumblebees consistently avoided the obstacle at a distance of 22 cm in both bright and dim light.
  • In dim light, bumblebees initiated their approach from a greater distance (at least 80 cm) and flew more slowly.
  • Despite reduced motion sensitivity, effective obstacle avoidance was maintained across light conditions.

Conclusions:

  • Bumblebees possess an effective strategy for obstacle avoidance in all active light conditions.
  • The findings support the hypothesis that a time-to-contact prediction mechanism underlies their navigation.
  • This strategy allows bumblebees to maintain safe flight and foraging activities during crepuscular periods.