a reference work. 
NATIONAL OCEANOGRAPHIC PROGRAM—1965 383 
7. Dynamics of fresh water stream invertebrate populations. 
a. T. F. Waters, Associate Professor, Department of Fisheries 
and Wildlife, University of Minnesota. 
b. To study major population dynamics of fresh water stream 
invertebrate populations, 
ec. Down stream drift of invertebrates is studied, involving 
relationships among production rate, rate of change in population density, 
and removal rate. Production rate is estimated and related to drift. 
8. Dynamics and ecology of Castor. canadensis. 
a. D. L. Allen, Professor of Wildlife Management, Purdue 
University. 
b. To determine the number and relationships of the beaver 
in a biotic community dominated by the timber wolf and in which the principal 
prey species is the moose. 
¢c. This study of an insular beaver population in upper Lake 
Superior involves an analysis of the trends of beaver numbers and their food 
supply. 
#9, Viral diseases of fresh-water fish. 
a. R. G. Malsberger, Lehigh University. 
b. To isolate and characterize the virus causing a number 
of diseases. 
ec. Tissue culture methods are used in addition to examination 
of various fresh-water fishes for lichens from which viruses might be isolated, 
*10, Systematic and ecological survey of North American Desmidiaceae. 
a. G. W. Prescott, Professor of Botany, Michigan State 
University. 
b. To synopsize North American Desmidiaceae and to provide 
ec. All available records and drawings of this group of 
western hemisphere algae are being compiled together with substantiated 
records of other workers on North American Desmids. The resulting publication | 
gives a brief description of each species and variety together with distribution 
data, habitat notes, and a summary of what is known about the ecology (with 
illustrations). 
