Date of Award

Fall 1984

Document Type


Degree Name

Master of Science (MS)


Ocean & Earth Sciences



Committee Director

Dorothy Spangenberg

Committee Member

David Feigenbaum

Committee Member

Ronald E. Johnson

Call Number for Print

Special Collections LD4331.O35P76


With the aid of the Aurelia Metamorphosis Test System, the acute or subtle morphological and behavioral effects of irradiation on the Norfolk Aurelia aurita were described and the sensitivity to X-irradiation of those organisms receiving thyroxine and those not receiving thyroxine was compared. Levels of radiation were 0 (control), 5,000, 10,000, 15,000, 20,000 and 40,000 rads. Morphology of the ephyrae, statolith and rhopalia numbers were recorded using the light microscope, Developmental abnormalities of the scyphistomae and ephyrae were recorded with the scanning electron microscope and light microscope. Two major findings from this investigation were the absence of rhopalia and statoliths at 15,000 and 20,000 rads and the development of two-bodied scyphistomae. There was a significantly higher frequency of monster scyphistomae in the group exposed to thyroxine prior to irradiation than in the group not exposed to thyroxine prior to irradiation.


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