Upper Midwest Environmental Sciences Center

UMESC - LTRMP Reports - Vegetation - 1999 Sampling Efforts - Pool 26

Home

About

Director's Overview

History of Center

Employee Directory

Map to Center

Partners

State Field Stations

Lake City, Minnesota

La Crosse, Wisconsin

Bellevue, Iowa

Great Rivers, Illinois

Open River, Missouri

Havana, Illinois

Field Station Directory

Science Programs

Aquatic Ecosystem Health

River Ecology

Long Term Resource Monitoring

Wildlife Ecology

Geospatial Sciences and Technology

Science Initiatives

Science Topics

Data and Tools

Publications

Software

Multimedia

News

Vegetation - Stratified Random Sampling

1999 Results

1999 Results in Pool 26 of the Upper Mississippi River

Sampling Efforts

We sampled Pool 26 of the Upper Mississippi River System (UMRS) and lower Illinois River from June 15 to August 15, 1999 (Figure 7). Three of the 650 total sites were not sampled because of inaccessibility.

Submersed Aquatic Vegetation

Submersed aquatic vegetation (SAV) was uncommon in Pool 26. Sago pondweed was the only SAV species encountered in 1999 and occurred in low frequency in isolated backwaters and main channel borders of the lower Illinois River and the impounded portion of Pool 26 (Table 5; Figure 8).

Rooted Floating-Leaf Vegetation

Only two species of rooted floating-leaf vegetation were encountered in 1999. American lotus occurred in low frequencies in isolated backwaters of the lower Illinois River and contiguous backwaters and main channel borders of Pool 26 of the UMRS.� Likewise, floating primrose-willow occurred in low frequencies and was encountered in isolated backwaters of the lower Illinois River.

Table 5.� Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating-leaf vegetation in Pool 26, Upper Mississippi River System, 1999.

Common name (Scientific name)	Contiguous backwater n = 80		Isolated backwater, Mississippi River n = 50		Isolated backwater, Illinois River n = 160		Impounded n = 80
Common name (Scientific name)	Freq	AI	Freq	AI	Freq	AI	Freq	AI
pondweed, sago (Potamogeton pectinatus)	-	-	-	-	1.3 � 0.9	0.1 � 0.1	1.3 � 1.3	0.1 � 0.1
all submersed species	-	-	-	-	1.3 � 0.9	0.1 � 0.1	1.3 � 1.3	0.1 � 0.1
	Freq	Cover	Freq	Cover	Freq	Cover	Freq	Cover
lotus, American (Nelumbo lutea)	1.3 � 1.3	0.6 � 0.6	-	-	2.5 � 1.2	1.1 � 0.6	-	-
primrose-willow, floating (Ludwigia peploides)	-	-	-	-	0.6 � 0.6	0.1 � 0.1	-	-
all rooted floating–leaf species	1.3 � 1.3	0.6 � 0.6	-	-	2.5 � 1.2	1.1 � 0.6	-	-

Table 5. Continued.

Common name (Scientific name)	Main channel border, Mississippi River n = 137		Main channel border, Illinois River n = 50		Secondary channel n = 90		Pool 26 n = 647
Common name (Scientific name)	Freq	AI	Freq	AI	Freq	AI	Freq	AI
pondweed, sago (Potamogeton pectinatus)	-	-	2.0 � 2.0	0.1 � 0.1	-	-	0.6 � 0.7	<0.1 � 0.1
all submersed species	-	-	2.0 � 2.0	0.1 � 0.1	-	-	0.6 � 0.7	<0.1 � 0.1
	Freq	Cover	Freq	Cover	Freq	Cover	Freq	Cover
lotus, American (Nelumbo lutea)	2.2 � 1.3	0.2 � 0.1	-	-	-	-	1.5 � 1.1	0.5 � 0.5
primrose-willow, floating (Ludwigia peploides)	-	-	-	-	-	-	0.2 � 0.5	<0.1 � <0.1
all rooted floating–leaf species	2.2 � 1.3	0.2 � 0.1	-	-	-	-	1.5 � 1.1	0.5 � 0.5

Image Preview	Figure - Description
	Figure 7. Aquatic area strata and sampling points in Pool 26, Upper Mississippi River System, 1999.
	Figure 8. Sites where species were recorded in Pool 26, Upper Mississippi River System, 1999. Species: all submersed species, sago pondweed (Potamogeton pectinatus), all rooted floating–leaf species, American lotus (Nelumbo lutea), and floating primrose-willow (Ludwigia peploides).

Content manager: Danelle Larson

April 5, 2002
Page Last Modified: April 17, 2018