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J. Moll. Stud. (1989), 55, 323-328
© The Malacological Society of London 1989

research-article

EFFECT OF AMINO ACID IMBALANCE IN ARTIFICIAL DIETS ON FOOD CHOICE AND FEEDING RATES IN TWO SPECIES OF TERRESTRIAL SNAILS, CEPAEA NEMORALIS AND ACHATINA FULICA

THOMAS H. CAREFOOT1 and MARILYN SWITZER-DUNLAP2

1Department of Zoology, University of British Columbia Vancouver, Canada; and 2Kewalo Marine Laboratory, Pacific Biomedical Research Center 41 Ahui Street, Honolulu, Hawaii

Postingestive response to dietary imbalance of amino acids was studied in two species of terrestrial pulmonate gastropods Cepaea nemoralis and Achatina fulica using agar-based chemical diets. Both species showed preference responses to an experimental diet complete in all nutrients, and aversive responses to experimental diets containing excesses of methionine (in concentrations 1-10% dry wt of diet). Aversion to methionine was stronger in Achatina than in Cepaea. One day's experience on a particular diet did not significantly affect an animal's subsequent feeding response on the same or different diets. What appeared to be more important in influencing food choice in both species was day-to-day contact with a given diet.

(Received 7 March 1988; accepted 4 May 1988)


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