The biomass and productivity of aquatic macrophytes in Navigation Pool 8 of the Upper Mississippi River

Abstract

The biomass of aquatic macrophytes in Navigation Pool 8 of the Upper Mississippi River was determined in order to provide basic data on the productivity, frequency, and distribution of these plants. Two 0.25 m2 quadrats constituted a sample at a given site. All vegetation, including underground parts, was removed from these quadrants. The vegetation in each sample was washed, separated into component species, frozen, dried, and weighed. Oven dry weight of each species per 0.5 m2 was recorded.