NATIONAL OCEANOGRAPHIC PROGRAM—1965 389 
1.. Movement of radioisotopes through lake ecological systems. 
a, A. D. Hasler, University of Wisconsin. 
b. To study the ecology of the Great Lakes area, 
c. Radioisotopes are used to trace biological activity and 
a number of organisms in the Great Lakes. 
d. $17,700 
2. Study of productivity in a stream ecosystem using radioactive 
tracers. 
a. R. C. Ball, Michigan State University. 
ay b. To investigate the ecology productivity in the Great 
akes. 
c. Radioactive tracers are used to study productivity rates 
in a number of organisms jn the streams feeding, tho Great Lakes. 
d. $29,600 
3. Fate and effects of radioisotopes in an aquatic food chain. 
“a, Chandler and Marshall, University of Michigan. 
° b. To study certain biological populations which feed on 
other populations. 
c. Radioisotopes are used to trace the fate of organisms 
which are digested by other organisms, etc. in the biological food chain. 
d. $44,800 
The projects which are sponsored by the AIC are centered geographically 
in areas contiguous to the Great Lakes, involving mostly the feeder streams 
to the lakes themselves. They relate primarily either to movement of material 
through the geographical environment or to passage of the constitugnts in 
the biological chain process, relating to factors such as growth etc. 
lh. Radioisotopes exchange studies in lakes. 
a. A.D. Hasler, Professor of Zoology and others, University 
of Wisconsin. 
b. To use small lakes as pilot models for experiments 
applicable to marine situations. 
