SOLUBLE AMINO ACID POOL IN SIPHONARIA ZELANDICA - ITS COMPOSITION AND INFLUENCE OF SALINITY CHANGES

1. 1. The free amino acid pool was analysed in different organs of the digestive tract of the pulmonate limpet, Siphonaria zelandica, and also in the algae on which this animal feeds. The distinctive amino acids were pipecolic acid, found only in the digestive gland on the mollusc, and cysteinolic acid, found only in the algae. 2. 2. Changes in the free amino acid pool in Siphonaria zelandica were analyzed under different salinities. These were controlled in the laboratory and also in natural conditions in the field. 3. 3. Siphonaria zelandica shows little ability to regulate its body fluids or intracellular organic compounds except in every low salinities to which it may often be subjected. © 1969.