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Journal of Experimental Biology 29,363-371 (1952)
Published by Company of Biologists 1952

The Physiology of Contractile Vacuoles : VIII. The Water Relations of the Suctorian Podophrya during Feeding

J. A. KITCHING ¹

¹ Department of Zoology, University of Bristol

1. The rate of output of the contractile vacuole of the suctorian Podophrya sp. was found to increase during feeding up to ten times. It decreased at the end of the meal but remained higher than it was before feeding.

2. The extra output of the contractile vacuole during feeding was approximately equal to the decrease in volume of the prey minus the increase in volume of the Podophrya.

3. In a typical meal roughly one-half of the food ingested by Podophrya was accommodated by expansion, and one half by concentration of the food taken in. This concentration was brought about by the action of the contractile vacuole.