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How stress alters memory in 'smart' snails.

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Area of Science:

  • Behavioral Ecology
  • Neuroscience
  • Animal Cognition

Background:

  • Cognitive ability varies within species, impacting memory formation under environmental stress.
  • The great pond snail (Lymnaea stagnalis) is a model for learning and memory studies, with existing research focused on a single Dutch strain.
  • Recent findings reveal natural Lymnaea stagnalis populations with significantly enhanced long-term memory (LTM) formation.

Purpose of the Study:

  • To investigate how two 'smart' snail populations (TC1 from Canada, CM from the U.K.) with enhanced LTM formation respond to ecologically relevant stressors.
  • To compare the stress response of enhanced memory populations to the standard Dutch strain.
  • To determine if mechanisms controlling cognitive differences are conserved across Lymnaea stagnalis populations.

Main Methods:

  • Operant conditioning of aerial respiratory behavior was used for training.
  • Standard training involved a 0.5-hour session in calcium pond water (80 mg/l [Ca(2+)]).
  • Stressors included low environmental calcium (20 mg/l [Ca(2+)]) and crowding (20 snails/100 ml) prior to training.

Main Results:

  • In control conditions, Dutch strain LTM lasted 1-3 hours, while TC1 and CM populations formed LTM lasting over 5 days.
  • Low calcium reduced LTM retention to 24 hours in TC1 and CM populations.
  • Crowding blocked LTM in all tested populations (Dutch, TC1, CM).
  • Despite different origins, CM and TC1 populations showed indistinguishable LTM formation under control and stressed conditions.

Conclusions:

  • Snails with enhanced cognitive ability exhibit similar responses to crowding stress as the standard Dutch strain.
  • Enhanced memory populations are more robust in forming LTM under low calcium conditions compared to the Dutch strain.
  • The cognitive differences in Lymnaea stagnalis memory formation appear to be controlled by conserved mechanisms across geographically distinct populations.