Abstract

The marine ciliate Paranophrys carnivora, isolated from the Mediterranean coast of Israel, was found to feed on a varied diet of bacteria, algae, and living and non-living tissues. Chlorococcum sp. and Dunaliella parva, the algal species on which P. carnivora grew best, did not elicit a chemosensory response; tissues and bacteria did. In experiments on stationary phase ciliates, betaine, choline, L-histidine, and trimethylamine oxide elicited a positive chemosensory response at concentrations as low as l0-6 M to l0-3 M.

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