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Biol Bull 144: 172-179. (February 1973)
© 1973 Marine Biological Laboratory
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EFFECTS OF SALINITY AND STARVATION ON THE UPTAKE AND UTILIZATION OF DISSOLVED GLYCINE BY AURELIA AURITA POLYPS

J. MALCOLM SHICK 1

1 Department of Biology, Texas A&M University, College Station, Texas 77843

1. The size of the labeled free glycine pools in recently fed Aurelia aurita polyps exposed to dissolved C14 glycine increased with salinity from 10 to 30permil; the decline at 40% is probably a reflection of stress on the animals.

2. The percentage of radioactivity present as ethanol insoluble material was inversely related to salinity between 10 and 30permil.

3. The rate of glycine uptake was unaltered after 288 hours of food deprivation at 10, 20, 30 and 40%.

4. The oxidation of radioactive glycine taken up from solution, as measured by the collection of C14O2, increased two-to threefold in starved polyps at 10, 20 and 30permil.

5. It is suggested that experiments utilizing starved animals, in which substrates derived from solid food are low, are of importance in elucidating the role of dissolved organic compounds as supplemental energy sources for marine invertebrates.






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