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Biol Bull 171: 672-681. (December 1986)
© 1986 Marine Biological Laboratory
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THE ACCUMULATION AND DISTRIBUTION OF VANADIUM, IRON, AND MANGANESE IN SOME SOLITARY ASCIDIANS

H. MICHIBATA 1, T. TERADA 2, N. ANADA 1, K. YAMAKAWA 1, and T. NUMAKUNAI 3

1 Biological Institute, Faculty of Science, Toyama University, Toyama 930
2 Department of Chemistry, Toyama College of Technology, Toyama 930-11
3 Asamushi Marine Biological Station, Tohoku University, Aomori 039-34, Japan

The vanadium, iron, and manganese contents of 15 species of solitary ascidians belonging to the suborders Phlebobranchia and Stolidobranchia were determined by thermal neutron activation analysis. Vanadium was detectable in all species examined. In general, the vanadium content in various tissues of the Phlebobranchia was considerably higher than the iron and manganese contents. The blood cells especially contained a large amount of vanadium. The highest value (21 µg vanadium/mg dry weight) was obtained from blood corpuscles of Ascidia ahodori. Species in the suborder Stolidobranchia, on the other hand, had smaller quantities of vanadium in comparison with those in the suborder Phlebobranchia. The iron and manganese contents did not differ greatly between the two suborders. The data are considered in the light of physiological roles of these transition metals in ascidians.

Submitted on April 3, 1986
Accepted on August 25, 1986




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