Perception of airborne odors by loggerhead sea turtles

Area of Science:

• Marine Biology
• Animal Behavior
• Sensory Ecology

Background:

• Sea turtles detect chemical cues in water.
• Unlike most marine animals, sea turtles surface to breathe, accessing both aquatic and aerial environments.
• This breathing behavior suggests potential access to airborne olfactory cues.

Purpose of the Study:

• To investigate if sea turtles possess the ability to detect airborne chemical cues.
• To determine the role of aerial olfaction in sea turtle behavior.

Main Methods:

• Loggerhead turtles (Caretta caretta) were placed in a water-filled arena.
• Airborne odorants from food and distilled water were introduced above the water surface.
• Turtles' activity, diving, and feeding behaviors were observed and recorded.

Main Results:

• Air passed over food elicited increased activity and feeding-related behaviors.
• Air passed over distilled water did not elicit a response.
• Behavioral responses occurred post-breathing, indicating detection of airborne cues.

Conclusions:

• Sea turtles, specifically loggerhead turtles, can detect airborne odors.
• This aerial olfactory ability is likely used in natural behaviors such as foraging and navigation.
• Provides the first direct evidence for airborne olfactory detection in sea turtles.