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Directional components derived from initial-orientation data of inexperienced homing pigeons
Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology
|August 1, 1986
Summary
Pigeons exhibit a
Area of Science:
- Animal behavior and navigation
- Ornithology
- Sensory biology
Background:
- Homing pigeons possess a remarkable ability to navigate back to their lofts over long distances.
- The mechanisms underlying this homing ability, particularly initial orientation, are complex and not fully understood.
- Previous research suggests pigeons may utilize various cues, including magnetic fields and olfactory information.
Purpose of the Study:
- To investigate the initial orientation behavior of inexperienced homing pigeons.
- To identify and characterize directional components influencing pigeon homing, specifically the 'preferred compass direction' (PCD).
- To explore the relationship between PCD and homeward orientation, and its potential role in 'release-site biases'.
Main Methods:
- Recording vanishing bearings of 1,324 inexperienced pigeons released from 36 sites (7-180 km).
- Analyzing orientation data to derive homeward and compass components.
- Investigating correlations between PCD, homeward direction, and release-site specific biases.
- Conducting experiments involving olfactory deprivation to assess PCD independence.
Main Results:
- A weak but significant 'homeward component' and a more pronounced 'compass component' (PCD) were identified.
- PCD was found to be negatively correlated with the divergence between PCD and homeward direction.
- PCD persisted and even strengthened after olfactory deprivation, indicating independence from olfactory cues.
- PCD was observed across multiple loft sites and varied in strength between naive and experienced pigeons.
Conclusions:
- Pigeons exhibit a 'preferred compass direction' (PCD) that influences their initial orientation.
- PCD is a directional tendency independent of olfactory-based site localization.
- PCD helps explain 'release-site biases' in pigeon homing behavior.
- The functional significance of PCD in pigeons' overall homing strategy requires further investigation.