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Science 7 April 1978:
Vol. 200. no. 4337, pp. 64 - 65
DOI: 10.1126/science.200.4337.64
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Articles

Tunicate Eggs Utilize Ammonium Ions for Flotation

CHARLES C. LAMBERT 1 and GRETCHEN LAMBERT 1

1 Department of Biological Sciences, California State University, Fullerton 92634 and Friday Harbor Laboratories, University of Washington, Friday Harbor 98250

Unlike most solitary ascidians, Corella willmeriana retains its eggs and embryos well past hatching. The early stages float to the top of the enlarged atrium from which they cannot escape. Ammonium ions replace other more dense substances in the cell sap of the float cells surrounding the embryo. Energy derived from glycolysis but not mitochondrial processes supports this process.

Submitted on November 1, 1977
Revised on January 9, 1978


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Science. ISSN 0036-8075 (print), 1095-9203 (online)