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Biol Bull 101: 84-94. (August 1951)
© 1951 Marine Biological Laboratory
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THE UPTAKE OF VANADIUM BY TUNICATES

EDWARD D. GOLDBERG 1, WILLIAM MCBLAIR 1, and KENNETH M. TAYLOR 1

1 Scripps Institution of Oceanography, La Jolla, and San Diego State College, San Diego, California

1. Chemical analyses made on Ciona intestinalis indicated the vanadium to be localized in the gut region and the ovaries. These sites of assimilation were confirmed by radioautographs utilizing cyclotron-produced radioactive vanadium.

2. The total vanadium content of four local species of ascidians was determined. The uptake of radioactive vanadium from sea water indicated that Ciona intestinalis and Ascidia ceratodes are able, by means of an adsorption mechanism, to concentrate vanadium directly from sea water. The efficiency of assimilation was of the order of 2frac12 per cent for unfed animals.

3. Pumping rate of water by Ciona intestinalis was determined by a direct method. It was concluded that sea water and its particulate constituents could furnish the necessary vanadium demanded by Ciona intestinalis.






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