1998 Annual Status Report: Submersed and Floating-Leaf Vegetation in Pools 4, 8, 13, and 26 and La Grange Pool of the Upper Mississippi River System

摘要

Aquatic vegetation was investigated in five navigation pools in the Upper Mississippi River System using a new protocol named 'stratified random sampling' or SRS protocol for the first time in 1998. The five pools were Pools 4, 8, 13, and 26 of the Upper Mississippi River and Us Grange Pool of the Illinois River. The results on submersed aquatic vegetation and rooted floating- leaf aquatic vegetation were summarized in this report. The percent frequencies of submersed aquatic vegetation in shallow water areas (