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Gen. Physiol. 50: 



1821-1834. 

 RICE, T. R. 



1967. Annual report of the Bureau of Com- 

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1968. Annual report of the Bureau of Com- 

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 year ending June 30, 1967. U.S. Fish 

 Wildl. Serv., Circ. 289, iii + 45 pp. 



WILLLMvlS, RICHARD B., and MARIANNE B. 

 MURDOCH. 

 1968. Compartmental analysis of production 

 and decay of J u n c u s roemerianus . 

 (Abstract.) Ass. Southeastern Biol. 

 Bull. 15: 59. 

 WILLIAMS, RICHARDS., MARIANNE B. MUR- 

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 1968. Standing crop and importance of zoo- 

 plankton in a system of shallow estu- 

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WILLIAMS, RICHARD B., and LEON K. 



THOMAS. 



1967. The standing crop of benthic animals 



in a North Carolina estuarine area. 



J. Elisha Mitchell Sci. Soc, 83: 1 35- 139. 



WOLFE, DOUGLAS A. 



1967. Accumulation of fallout cesium-137 

 by an estuarine clam. Bull. Ecol. Soc. 

 Amer. 48: 128. 



An unusually light-shelled form of the 

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 Cassis madagascariensis and C_. m. 

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 Molluscs in radiobiology and radio- 

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Seasonal variation of caesium-1 37 from 

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Research by Graduate Students from 

 North Carolina State University, Raleigh, N.C. 



Five staff members of the Radiobiological 

 Laboratory are Adjunct Professors in the 

 Zoology Department at North Carolina State 

 University. During the past fiscal year, the 

 following graduate students have used our 

 facilities and received guidance from members 

 of our staff. 



Student 



Candidate for 

 Degree 



Adviser 



Adams, S. Marshall M.S. - Zoology J. W. Angelovlc 



Byron, Michael M.S. - Zoology R. B. Williams 



Sick, Lowell Ph. D. - Zoology T. R. Rice 



Tenore, Kenneth Ph. D. - Zoology T. W. Duke 



Thayer, Gordon Ph. D. - Zoology R. B. Williams 



Ustach, Joseph M.S. - Zoology D. A. Wolfe 



Brief reviews of the students' research prob- 

 lems follow: 



UTILIZATION OF DETRITUS BY SOME 



MACRO-FAUNA OF AN EEL GRASS 



COMMUNITY 



S. Marshall Adams 



Objective; 



To determine if certain animals associated 

 with eel grass beds utilize detritus and its 

 associated bacteria as food. 



Justification: 



Extensive eel grass beds n-iake up an im- 

 portant part of the ecology of the Beaufort 

 estuary. These beds serve as nursery grounds 

 by providing food and protection for larval fish 



and shrimp. In these beds, detritus, mostly of 

 eel grass origin, forms a thick mat over the 

 bottom. A large amount of the organic matter 

 that might be utilized as food by organisms of 

 the eel grass community is this detritus. It 

 seems that most of the eel grass production 

 accumulates as detritus and very little washes 

 out into the estuary, so it is important to know 

 if animals of this community utilize this store- 

 house of energy as food. 



Experimental Procedure: 



Detritus was prepared by labeling living eel 

 grass with carbon 14, drying the grass, and 

 grinding it into a powder. To convert the eel 

 grass into detritus as rapidly as possible, sea 

 water was added to the powdered grass and 

 this mixture was inoculated with bacteria that 

 had been grown on an agar made of eel grass 

 extract. This culture was incubated on a shaker 

 for 10 days. 



The labeled detritus was then placed in the 

 presence of an experimental aninnal in spec- 

 ially constructed experimental chan^bers. The 

 chambers consisted of two tubes that were 

 sealed at one end. The two tubes were connected 

 by a watertight seal with a Millipore-"- filter 

 partition between the tubes. The tube on one side 

 of the filter contained animals in sea water 

 plus labeled detritus. The tube on the other 

 side, which had the experimental animals with 

 only sea water, served as a control. 



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