Predator detection enables juvenile Lymnaea to form long-term memory.

Area of Science:

• Behavioral Ecology
• Neuroscience
• Animal Behavior

Background:

• Learning and memory are crucial for adaptation to environmental changes.
• Juvenile Lymnaea exhibit limited long-term memory (LTM) formation via operant conditioning but can form LTM through classical conditioning.
• Previous research indicated reduced LTM capacity in juvenile Lymnaea under specific conditioning methods.

Purpose of the Study:

• To investigate if predator detection influences LTM formation in juvenile Lymnaea.
• To determine if exposure to a predator enhances the capacity for LTM following operant conditioning.
• To explore the role of stress from predator cues in altering learning and memory.

Main Methods:

• Laboratory-reared juvenile Lymnaea were exposed to a sympatric predator (crayfish).
• Aerial respiratory behavior was monitored and operant conditioning was applied to this behavior.
• The capacity for long-term memory formation was assessed before and after predator exposure.

Main Results:

• Juvenile Lymnaea detected the predator and altered their aerial respiratory behavior, increasing breathing time.
• Predator detection significantly enhanced the capability of juvenile Lymnaea to form LTM via operant conditioning.
• Snails exposed to predators demonstrated a marked improvement in forming long-lasting memories.

Conclusions:

• Biologically relevant stress from predator detection induces phenotypic alterations, specifically enhanced LTM formation, in juvenile Lymnaea.
• Enhanced LTM formation in response to predators may increase juvenile fitness by improving adaptive responses.
• Predator detection and learning/memory formation act as an inducible defense mechanism in these aquatic snails.