304 



AQUATIC CLIMAX COMMUNITIES 



400 



300 



200 



6 mo. 



2yrs, 



6yrs. 



10 yrs. 



23 yrs. 



Fig. 71. — Successional development of the bottom community in still water, 



based on five water-supply reservoirs. The time indications below are not to 



scale. (After Gersbacher, 1937.) 



