122 Reproduction, Competition, and Predation 



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TOTAL LENGTH OF FISH, INCHES 



Figure 5.6. Estimated number of ova from warmouths of various total 

 lengths in collections from Venard Lake and Park Pond (Illinois) in 1949. 

 Scattergram, regression line, and coefficient of correlation (r) are given for 

 each collection group. Each graphic symbol represents one female from which 

 the number of ova was estimated. Venard-Lakc warmouths belonged to a pop- 

 ulation of fish that was expanding rapidly. In Park Pond the warmouths were 

 subjected to severe competition for food and space, and many were heavily 

 parasitized. [From Larimore, R.W., III, Nat. Hist. Survey Bull, 27(1) (1957)] 



