ECOLOGY - Continued 



MOOREj Walter Guy» Studies on the oxygen requirements of certain 

 fresh-water fishes, with special reference to winter conditions » PhD, 

 Minnesota, I9IJI0 



PEMNAK, Robert W. The ecology of the psammolittoral organisms of 

 some Wisconsin lakes, with special reference to the Tardigrada, Cope- 

 poda, and Rotatoria o PhD, "ffisconsin, 1938. 



PERLMUTTER, Alfredo Variation of American North Atlantic marine 

 fishes correlated with the environment. PhD, llichigan, 19^1 = 



PRATT, Harold Po Ecology of the trout of the Gunnison River. 

 PhD, Colorado, 1938. 



REIFj Charles Braddock. A study of Minnesota stream communities. 

 PhD, Minnesota, I9UI0 



RICKER, William E.. Studies of the limnological factors affecting 

 the propagation and survival of the sockeye salmon, Oncorhynchus nerka, 

 at Cultus Lake, British Columbia. PhD, Toronto, 193'51 



ROELOFS, Eugene Woodrov/, Water soils in relation to lake produc- 

 tivity. PhD, Michigan State, 19U1. 



ROGERS, Harold M. The estuary as a biological habitat, with 

 special reference to the smelt Osmerus mordax (Llitchill). PhD, 

 Toronto, 1939 ■> 



SCOTT, Grace Winnifred Workman. Certain aspects of the behavior 

 of frog tadpoles and fish with respect to temperature. PhD, Toronto, 

 19h3. 



SHAPIRO, Sidney^ Geographic variation in Fundulus diaphanus, a 

 Cyprinodontid fish. PhD, Ijlichigan, 19U7<. 



SMITH, George F., M. Some factors limiting the distribution and 

 size of the starfish Asterias vulgaris (Verrill). PhD, Toronto, 1939. 



SOLMAN, Victor Edward Frick. The ecological relations of water- 

 fowl with special reference to predatory fish. PhD, Toronto, I9I42. 



STARRETT, William C. An ecological study of the minnows of the 

 Des Moines River, Boone County, Iowa. PhD, Iowa State, 19U8. 



TARZWELL, Clarence M. Environmental imporvement in trout streams; 

 a problem in applied ecology. PhD, Michigan, 1936. 



