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Prey pursuit and interception in dragonflies.
R M Olberg1, A H Worthington, K R Venator
1Department of Biological Sciences, Union College, Schenectady, NY 12308, USA. olbergr@union.edu
Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology
|March 9, 2000
Summary
Dragonflies (Odonata) intercept prey by flying towards the predicted interception point, minimizing visual motion. They use prey angular velocity, not parallax, to detect nearby targets.
Area of Science:
- Entomology
- Animal Behavior
- Neuroethology
Background:
- Dragonflies (Order Odonata) are sit-and-wait predators that hunt flying insects.
- Understanding their prey pursuit strategies is key to deciphering insect predatory behaviors.
Purpose of the Study:
- To investigate the visual strategies dragonflies use to intercept prey.
- To determine how dragonflies discriminate the distance of potential prey targets.
Main Methods:
- Videotaping 36 prey-capture flights of two dragonfly species (Erythemis simplicicollis and Leucorrhinia intacta).
- Frame-by-frame analysis of flight paths and visual cues.
- Investigating the role of angular velocity and parallax in prey detection.
Main Results:
- Dragonflies steer to minimize prey image movement on the retina, flying directly to the predicted interception point.
- A peak in prey angular velocity before takeoff may signal nearby targets.
- Parallax information from head movements is not essential for successful prey pursuit.
Conclusions:
- Dragonfly prey interception relies on a strategy of direct pursuit towards a calculated interception point.
- Visual cues like prey angular velocity are crucial for distance discrimination, potentially mediated by specific neural pathways.
- This study provides insights into the neuroethology of insect visual predation.