PROBLEMS IN POPULATION INPUT-OUTPUT DYNAMICS 203 



Watt, K. E. F. (1959a). A mathematical model for the effect of densities of attacked and attacking 



species on the number attacked. Canad. Ent., 91, 129-44. 

 Watt, K. E. F. (1959b). Studies on population productivity. II. Factors governing productivity 



in a population of smallmouth bass. Ecol. Mcnogr., 29, 367-92. 

 Watt, K. E. F. (1960^:). The effect of population density on fecundity in insects. Canad. Ent., 92, 



674-95. 

 Watt, K. E. F. (1960^). Mathematical models and insect pest control. Canad. Ent. Supplement 



19. 



