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Perception of ocean wave direction by sea turtles
The Journal of Experimental Biology
|January 1, 1995
Summary
Hatchling sea turtles navigate offshore by sensing wave direction. This study shows young loggerhead and green turtles can detect wave direction using underwater motion cues, guiding their migration.
Area of Science:
- Marine Biology
- Animal Behavior
- Biophysics
Background:
- Hatchling sea turtles migrate offshore at night, using oceanic waves for navigation.
- The mechanism by which sea turtles detect wave direction underwater in darkness remains unexplained.
Purpose of the Study:
- To investigate if loggerhead (Caretta caretta L.) and green turtle (Chelonia mydas L.) hatchlings can detect wave direction by sensing underwater movements.
- To determine if turtles use the circular motion of water beneath waves for orientation.
Main Methods:
- A wave motion simulator was used to replicate underwater wave-induced circular movements in air.
- Hatchling turtles were subjected to simulated wave motions from different directions.
Main Results:
- Turtles turned right when simulated waves approached from their right.
- Turtles turned left when simulated waves approached from their left.
- Minimal turning occurred when simulated waves came from directly ahead.
Conclusions:
- Hatchling sea turtles can determine wave propagation direction by sensing underwater accelerations.
- This wave-sensing mechanism may be utilized by other marine migrants like fish and cetaceans.