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We sampled Pool 26 of the Upper Mississippi River System (UMRS) and lower Illinois River from June 15 to August 15, 2000 (Figure 7). Three of the 400 total sites were not sampled because of inaccessibility.
Six species of submersed aquatic vegetation (SAV) were encountered in low frequencies from isolated backwaters of the lower Illinois River and Pool 26 of the UMRS (Table 5; Figure 8). About 14% of the isolated backwater sites sampled on the lower Illinois River had SAV. The most frequent SAV species encountered was sago pondweed. The frequency of SAV in isolated backwaters of Pool 26 of the UMRS was considerably lower (2.4%).
Two species of rooted floating-leaf vegetation was encountered in isolated backwaters of the lower Illinois River and contiguous backwaters, isolated backwaters, and impounded portion of Pool 26 of the UMRS. American lotus commonly occurred in isolated backwaters of the lower Illinois River and in contiguous backwaters of Pool 26 of the UMRS. However, percent cover of the backwaters was low.
Content manager: Dr. Yao Yin
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.umesc.usgs.gov/reports_publications/ltrmp/veg/2000/pool26.html
Page Contact Information: Contacting the Upper Midwest Environmental Sciences Center
Page Last Modified:
October 2, 2007
