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Distribution of Intracellular Sodium, Potassium and Chloride in Arenicola Marina Equilibrated to Diluted Sea Water

Published online by Cambridge University Press:  11 May 2009

R. F. H. Freeman  and
T. J. Shuttleworth
R. F. H. Freeman
Affiliation:
Department of Zoology, University of Otago, Dunedin, New Zealand
T. J. Shuttleworth
Affiliation:
Department of Biological Sciences, University of Exeter, Hatherly Laboratories, Prince of Wales Road, Exeter EX4 4PS
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Extract

In some earlier papers we have discussed the distribution of water and the total amounts of the major inorganic solutes in the cells of Arenicola marina (L.) equilibrated to full-strength and to diluted sea water (Freeman & Shuttleworth 1977b, c). We concluded that adaptation to dilute media by this osmoconforming worm was dependent entirely upon the regulation of cell volume. In dilute media substantial amounts of water do enter the cells but down to about 30% sea water this is only 55% of that which would have entered if the osmotic equilibrium was accomplished by entry of water alone. The influx of water is restrained by simultaneous loss of solute, an increasing amount of solute being lost or rendered osmotically inactive as the dilution increases. For lugworms in 35% sea water, for example, the volume of cell water has doubled compared with worms in 100% sea water, but the increase would have been far greater if the intracellular solutes had not declined by 30%.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 65 , Issue 2 , May 1985 , pp. 395 - 413
Copyright
Copyright © Marine Biological Association of the United Kingdom 1985

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