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College of Forestry 



Summary 



The data presented in the previous pages of this chapter 

 indicate a calculated population of 4,704,545,137 mollusks and 

 3,062,267,255 associated animals or a total animal population 

 of 7,766,812,392 within the area of 1,164 acres, the total terri- 

 tory examined (Table No. 38). Of this amount 6,783,687,025 

 inhabit the bottom within the 6-foot contour and 983,125,367 

 occupy the territory beyond the 6-foot contour. This means 

 that about seven billion animals live in an area of 205 acres, 

 while nearly one billion live in 959 acres, a ratio of 33 million 

 per acre against about one million per acre or about 33 to one. 

 This great decrease in the number of individuals is significant, 

 showing that the rich life areas border the shore where the vege- 

 tation is abundant, in zvater from a foot to six feet in depth. 

 Beyond this depth the number of individuals rapidly diminish. 

 Fish are also "more abundant in species on shoals in shallow 

 water than in the deeper parts of the lake, and the majority 

 of young fish live in this area. This fact is graphically shown 



Table No. 36. Number of Marine Animals in .One Square Meter 



