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Ionic regulation and buoyancy in some planktonic organisms

Published online by Cambridge University Press:  11 May 2009

C. Newton
Biological Sciences, Institute of Environmental & Biological Sciences, University of Lancaster, Bailrigg, Lancaster, LAI 4YQ
W. T. W. Potts
Biological Sciences, Institute of Environmental & Biological Sciences, University of Lancaster, Bailrigg, Lancaster, LAI 4YQ


Magnesium/chlorine and sulphur/chlorine ratios have been measured in the body fluids of some planktonic organisms by x-ray emission analysis of frozen hydrated specimens in a scanning electron microscope. Homarus vulgaris (Anthropoda: Decapoda) larvae excluded Mg2+ and SO42-ions from the haemolymph, but to a lesser extent than does the adult lobster. Bipinnaria larvae of Asterias (Echinodermata) excluded Mg2+ and SO42-ions from the coelomic fluid. Obelia medusae excluded Mg2+ and SO42-ions from the mesogloea but concentrate them in the gastrovascular system. The high concentration of sulphate in the gastrovascular fluid of medusae has been confirmed by rhodizonate titration in Cyanea and Rhizostoma jellyfish. Some implications of magnesium and sulphate regulation are discussed.

Research Article
Copyright © Marine Biological Association of the United Kingdom 1993

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