Developmental changes in conditioned taste aversion in Lymnaea stagnalis

Mari Yamanaka, Hisayo Sadamoto, Dai Hatakeyama, Hiroshi Nakamura, Satoshi Kojima, Tetsuya Kimura, Masakane Yamashita, Akihisa Urano, Etsuro Ito

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

As the first step to study relationships between development and learning in the molluscan central nervous system, we examined developmental changes in acquisition and retention of a conditioned taste aversion (CTA) in the pond snail, Lymnaea stagnalis. We found that snails developed ability of a CTA as a long-term memory through three critical stages. Embryos in veliconcha started to respond to appetitive sucrose at the first critical stage. This response was in good agreement with morphological observations that embryos at this developmental stage seemed to be physically ready to eat. However, they could not associate this appetitive stimulus (conditioned stimulus: CS) with an aversive stimulus of KCI (unconditioned stimulus: UCS). At the second critical stage, embryos just before hatching acquired the CTA, but the conditioned response did not persist. Through this stage, they may acquire learning ability to safely seek out food in an external environment. At the third critical stage, immature snails with a 10 mm shell could use a long-term memory to maintain the conditioned response. This memory persisted for at least a month, showing that now they are able to maintain a long-term memory so that they can safely eat a variety of food when they cover wide territory to search for a mate. The present findings indicate that the development of learning ability in snails, which secures acquisition of better survival ability, is coincident with the major changes in their life cycle.

Original languageEnglish
Pages (from-to)9-16
Number of pages8
JournalZoological Science
Volume16
Issue number1
Publication statusPublished - 1999 Feb
Externally publishedYes

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Lymnaea stagnalis
snails
embryo (animal)
learning
shell (molluscs)
central nervous system
life cycle (organisms)
foods
hatching
immatures
developmental stages
sucrose

ASJC Scopus subject areas

  • Animal Science and Zoology

Cite this

Yamanaka, M., Sadamoto, H., Hatakeyama, D., Nakamura, H., Kojima, S., Kimura, T., ... Ito, E. (1999). Developmental changes in conditioned taste aversion in Lymnaea stagnalis. Zoological Science, 16(1), 9-16.

Developmental changes in conditioned taste aversion in Lymnaea stagnalis. / Yamanaka, Mari; Sadamoto, Hisayo; Hatakeyama, Dai; Nakamura, Hiroshi; Kojima, Satoshi; Kimura, Tetsuya; Yamashita, Masakane; Urano, Akihisa; Ito, Etsuro.

In: Zoological Science, Vol. 16, No. 1, 02.1999, p. 9-16.

Research output: Contribution to journalArticle

Yamanaka, M, Sadamoto, H, Hatakeyama, D, Nakamura, H, Kojima, S, Kimura, T, Yamashita, M, Urano, A & Ito, E 1999, 'Developmental changes in conditioned taste aversion in Lymnaea stagnalis', Zoological Science, vol. 16, no. 1, pp. 9-16.
Yamanaka M, Sadamoto H, Hatakeyama D, Nakamura H, Kojima S, Kimura T et al. Developmental changes in conditioned taste aversion in Lymnaea stagnalis. Zoological Science. 1999 Feb;16(1):9-16.
Yamanaka, Mari ; Sadamoto, Hisayo ; Hatakeyama, Dai ; Nakamura, Hiroshi ; Kojima, Satoshi ; Kimura, Tetsuya ; Yamashita, Masakane ; Urano, Akihisa ; Ito, Etsuro. / Developmental changes in conditioned taste aversion in Lymnaea stagnalis. In: Zoological Science. 1999 ; Vol. 16, No. 1. pp. 9-16.
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