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Biol Bull 122: 310-319. (April 1962)
© 1962 Marine Biological Laboratory
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IONIC AND WATER BALANCE OF PLANARIANS

H. BURR STEINBACH 1

1 Department of Zoology, University of Chicago, Chicago 37, Illinois

1. The Na, K and Cl concentrations (mM/Kg. wet weight) of Dugesia tigrinum, are 14.6, 38.2 and 18.8. For the marine triclad Bdelloura the concentrations are, respectively, 122, 97 and 135.

2. Flux rates for the ions and for tritiated water are faster in the marine flatworms. Exchange of tritiated water, however, is very fast (half time values < 3 minutes) for both forms.

3. Bdelloura can live for extended periods of time in dilute sea water, swelling to a new volume which is maintained until returned to a normal sea water medium. Bdelloura swollen in dilute sea water do not lose K, even though the K concentration drops due to the volume increase.






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Copyright © 1962 by the Marine Biological Laboratory.