Abstract
THE internal medium of the Crustacea varies in inorganic composition from species to species, but keeps at least a general resemblance to sea water. In one sense the composition is entirely determined by the environment and regulatory mechanisms of the species, but these mechanisms have presumably evolved so as to maintain the balance of ions close to an optimum for each physiological process. Although some of these conditions of optimum balance may vary between species, those that do not should reveal themselves through correlations among the levels of various ions. The aim here is to consider correlations among sodium, potassium and magnesium. There is known to be an inverse relationship between concentration of magnesium and activity in marine species caused, perhaps, by the depressant action of magnesium at the neuromuscular junction1.
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BURTON, R. Ionic Balance in the Crustacea. Nature 213, 812–813 (1967). https://doi.org/10.1038/213812a0
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DOI: https://doi.org/10.1038/213812a0
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