The effect of rearing environment on memory formation.

Area of Science:

• Neuroscience
• Behavioral Science
• Ecology

Background:

• Lymnaea stagnalis is a key model for studying environmental impacts on learning and memory.
• Wild strains of L. stagnalis exhibit variations in memory formation.
• Laboratory strains can diverge due to distinct rearing conditions.

Purpose of the Study:

• To investigate memory formation differences between two laboratory-bred L. stagnalis strains (C-strain and B-strain).
• To determine if environmental factors contribute to observed behavioral divergence in memory abilities.
• To assess the heritability and plasticity of memory formation in these strains.

Main Methods:

• Comparative analysis of long-term memory (LTM) formation in C-strain and B-strain L. stagnalis.
• Controlled rearing of strains in different laboratory environments (University of Calgary and Brock University).
• Assessment of memory acquisition (training sessions) and retention duration.

Main Results:

• C-strain required two training sessions for LTM, while B-strain required four.
• LTM persisted longer in the C-strain compared to the B-strain.
• The B-strain reared in the Calgary environment showed improved memory within one generation.
• The C-strain reared in the Brock University environment maintained its memory ability across two generations.

Conclusions:

• Laboratory-bred L. stagnalis strains can develop distinct memory-forming abilities despite shared ancestry.
• Local environmental factors play a significant role in driving behavioral divergence in memory.
• Environmental plasticity influences memory formation in L. stagnalis, with potential implications for understanding adaptation.