Abstract
1. 1. The effect of d,l-C-propargylglycine (PG). which has been reported previously as a chemicall disintegrator of nematocysts in the tentacle, upon feeding responses in Hydra japonica was examined. 2. 2. After treatment with 2 mM PG, three types of feeding responses (GSM-induced tentacle ball formation, GSM-induced mouth-opening and prey ingestion) disappeared within 2 days. 3. 3. Mouth-opening and the prey ingestion, however, recovered 2 days after animals were transferred back to culture medium without PG, while ball formation recovered 6 days after PG removal. 4. 4. These results show that the tentacle ball formation response has no correlation with prey ingestion. although the mouth-opening response was neccesary for prey ingestion. 5. 5. These results support a previous hypothesis that each feeding response composing the feeding behavior of hydra results from a different receptor-effector system.
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