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Biol Bull 141: 364-371. (October 1971)
© 1971 Marine Biological Laboratory
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EFFECTS OF SALINITY AND STARVATION ON RELEASE OF DISSOLVED FREE AMINO ACIDS BY DUGESIA DOROTOCEPHALA AND BDELLOURA CANDIDA [PLATYHELMINTHES, TURBELLARIA]

K. L. WEBB 1, R. E. JOHANNES 1, and S. J. COWARD 1

1 Virginia Institute of Marine Science, Gloucester Point, Virginia 23062 and Department of Zoology, University of Georgia, Athens, Georgia 30601

1. Immediately after feeding, Dugesia loses almost half as many calories in FAA release as via respiration. After one day, calorie loss via FAA release drops to less than 0.6% of that lost through respiration.

2. Loss of FAA from 24 hr starved animals of Dugesia and Bdelloura is highly correlated with environmental salinity (r = 0.95).

3. FAA loss appears to occur in two phases, the first consisting of a rapid loss of non-assimilated material, and the second a lesser and gradual loss of (presumably) assimilated material.

4. Glycine or serine, the two lowest energy content amino acids, are predominant among the FAA released by Bdelloura and Dugesia, respectively.






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Copyright © 1971 by the Marine Biological Laboratory.