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Fig. 1. Feeding responses elicited by different tastes applied to the lips of
snails. (A) The number of bites min–1 elicited in snails by
increasing the concentration of D-sucrose (sweet taste). (B) As in
A, but sodium-L-glutamic acid (Na-L-Glu, umami taste,
closed squares) was used as the stimulant. The open circles represent
experiments in which a cocktail consisting of 3 mmol l–1
sucrose and 10 mmol l–1 Glu was applied to the lips. Notice
that based on the data obtained in A, it would be expected that this cocktail
would elicit a response of at least 10 bites min–1. However,
this cocktail only produced the same level of feeding as that produced by Glu
alone or by sucrose alone at these concentrations. (C) Again as in A, but
carrot juice (complex taste) was used as the stimulant to the lips. All data
are means ± s.e.m. obtained from 20 snails. The x axis is in
logarithmic scale. These results show that 10 mmol l–1
sucrose or 0.3% carrot juice induces a reliable feeding response in
snails.
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