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Ionic Regulation and Mode of adjustment to Reduced Salinity of the Starfish Asterias Rubens L.

Published online by Cambridge University Press:  11 May 2009

John Binyon
John Binyon
Affiliation:
Department of Zoology, Royal Holloway College, London
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Extract

The perivisceral and ambulacral fluids of Asterias rubens have been shown to be not only isosmotic but isoionic with sea water, even if that medium is diluted by nearly half. However, there is a slight accumulation and regulation of calcium in the perivisceral fluid and to a much more marked extent, potassium in the water vascular system. The rapidity with which the potassium diffuses away when the ambulacral fluid is dialysed against sea water suggests that its presence in the water vascular system is due to an active accumulatory mechanism. This mechanism is capable of functioning when the animal encounters sea water of significantly reduced salinity, over the temperature range 0—20° C and extends throughout the season apparently uninfluenced by the breeding cycle or sex of the animal. Smaller animals tend to have a higher concentration of potassium in the water vascular system than do larger ones. Direct and indirect measurements of salt loss under various conditions, together with observations on the rate of lithium transfer, suggests that the integument is very permeable to many ions as well as to water. This supports the hypothesis that the ionic regulation observed results from an active process and not merely from an impermeability of the integument, although measurements with potassium itself have not yet been made.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 42 , Issue 1 , February 1962 , pp. 49 - 64
Copyright
Copyright © Marine Biological Association of the United Kingdom 1962

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