Macroscopic invertebrates were removed and counted from 355 samples of higher aquatic vegetation collected between 23 June 1965 and 3 September 1965 at Clear Lake, Iowa. It was found that all species of higher aquatic plants do not harbor the same populations of animals and that the composition of the macroscopic invertebrate populations on the plants showed a successional variation throughout the summer. A direct linear relationship was found between the surface areas of aquatic plants and the numbers of animals found on their surfaces
