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The responses of Scrobicularia plana (da Costa) to osmotic pressure changes

Published online by Cambridge University Press:  11 May 2009

R. F. H. Freeman  and
F. H. Rigler
R. F. H. Freeman
Affiliation:
From the Department of Zoology, Queen Mary College, University of London, and the Plymouth Laboratory
F. H. Rigler
Affiliation:
From the Department of Zoology, Queen Mary College, University of London, and the Plymouth Laboratory
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Extract

The osmotic pressure of the blood of Scrobicularia plana has been measured when the animal is exposed to diluted sea water, and observations made on the behaviour of the animal when exposed to solutions of different osmotic pressure.

The blood osmotic pressure shows no significant difference to that of the external medium except in very low salinities. The external medium with which an animal in its natural habitat comes into equilibrium is represented by the water above the mud rather than the water contained in the mud. Open animals equilibrate to 80% sea water in 4–5 h and to 60% sea water in 5–6 h. The osmotic pressure of the blood of animals that remain closed in dilute media is decreased by as little as 1·5% per hour.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 36 , Issue 3 , November 1957 , pp. 553 - 567
Copyright
Copyright © Marine Biological Association of the United Kingdom 1957

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