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The permeability of the asteroid podial wall to water and potassium ions

Published online by Cambridge University Press:  11 May 2009

J. Binyon
J. Binyon
Affiliation:
Department of Zoology, Royal Holloway College (University of London), Englefield Green, Surrey
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Extract

Direct measurement of water loss from isolated podia of Luidia ciliaris under the influence of known levels of hydrostatic pressure has yielded a revised value for the permeability of this structure to water, namely 37.4 x 10-8 cm3/cm2.s.cm H2O pressure. The total fluid loss from a 50 g starfish will therefore be of the order of 0.75 ml/h. The mechanism for the replenishment of this fluid is discussed in the light of the traditional role of the madreporite. It would seem that adequate influx of fluid through this structure has not been observed, neither could it be responsible for ‘topping up’ in the case of arms severed from the parent body which still continue to move for considerable periods.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 56 , Issue 3 , August 1976 , pp. 639 - 647
Copyright
Copyright © Marine Biological Association of the United Kingdom 1976

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