Upper Midwest Environmental Sciences Center

Table 8.  Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating–leaf vegetation in Pool 4, Upper Mississippi River System, 2002.
Vegetation - Stratified Random Sampling 2002

Table 8.  Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating-leaf vegetation in Pool 26, Upper Mississippi River System, 2002.

Common name
(Scientific name) 		 Contiguous 
backwater
n = 73		 Isolated backwater,
Illinois River
n = 97		 Isolated backwater,
Mississippi River
n = 53
Freq 
AI 
Freq 
AI 
Freq 
AI 
 pondweed, leafy 
(Potamogeton foliosus)
-
-
1.0 ± 1.0
0.1 ± 0.1
-
-
 pondweed, longleaf 
(P. nodosus) 
-
-
1.0 ± 1.0
0.1 ± 0.1
-
-
 pondweed, sago 
(P. pectinatus) 
-
-
4.1 ± 2.0
0.4 ± 0.2
1.9 ± 1.9
0.1 ± 0.1
 stargrass, water 
(Heteranthera dubia)
-
-
2.1 ± 1.5
0.2 ± 0.1
-
-
 waternymph, southern 
(Najas guadalupensis) 
-
-
4.1 ± 2.0
0.6 ± 0.3
-
-

 all submersed species 
-
-
6.2 ± 2.5
1.0 ± 0.4
1.9 ± 1.9
0.1 ± 0.1
 
Freq 
Cover 
Freq 
Cover 
Freq 
Cover 
 lotus, American 
(Nelumbo lutea)
  4.1 ± 2.3 
  2.1 ± 1.4 
  6.2 ± 2.5 
2.7 ± 1.4
-
-
 primrose-willow, floating 
(Ludwigia peploides) 
-
-
1.0 ± 1.0
0.1 ± 0.1
  13.2 ± 4.7 
1.3 ± 0.5

 all rooted floating-leaf species 
4.1 ± 2.3
 2.1 ± 1.4 
7.2 ± 2.6
2.8 ± 1.4
13.2 ± 4.7
1.3 ± 0.5

Table 8. Continued.

Common name
(Scientific name) 		       Impounded 
n = 40		  Main channel    border,
Illinois River
n = 17		    Main channel    border, 
Mississippi River
n = 28
Freq 
AI 
Freq 
AI 
 Freq 
AI 
 pondweed, leafy  (Potamogeton foliosus)
-
-
-
-
-
-
 pondweed, longleaf 
(P. nodosus)
-
-
-
-
-
-
 pondweed, sago 
(P. pectinatus)
-
-
-
-
-
-
 stargrass, water 
(Heteranthera dubia)
-
-
-
-
-
-
 waternymph, southern 
(Najas guadalupensis) 
-
-
-
-
-
-

 all submersed species 
-
-
-
-
-
-
 
Freq 
Cover 
Freq 
Cover 
Freq 
Cover 
 lotus, American 
(Nelumbo lutea)
-
-
-
-
-
-
 primrose-willow, floating (Ludwigia peploides) 
-
-
-
-
-
-

 all rooted floating-leaf species 
-
-
-
-
-
-

Table 8. Continued.

Common name
(Scientific name) 
Secondary channel
n = 21
Pool 26
n = 329
  Freq 
AI 
Freq 
AI 
 pondweed, leafy
(Potamogeton foliosus) 
- 
- 
  0.4 ± 0.4 
<0.1 ± <0.1
 pondweed, longleaf
(P. nodosus) 
- 
- 
0.4 ± 0.4
<0.1 ± <0.1
 pondweed, sago
(P. pectinatus) 
- 
- 
1.7 ± 0.8
0.2 ± 0.1
 stargrass, water
(Heteranthera dubia)
- 
- 
0.8 ± 0.5
0.1 ± <0.1
 waternymph, southern
(Najas guadalupensis) 
- 
- 
1.5 ± 0.8
0.2 ± 0.1
 
all submersed species 
- 
- 
2.4 ± 0.9
0.4 ± 0.1
 
Freq 
Cover 
Freq 
Cover 
 lotus, American
(Nelumbo lutea)
- 
- 
2.6 ± 0.9
1.1 ± 0.5
 primrose-willow, floating
(Ludwigia peploides) 
- 
- 
1.1 ± 0.5
0.1 ± <0.1
 
all rooted floating-leaf species 
- 
- 
3.7 ± 1.0
1.2 ± 0.5

Page Last Modified: April 17, 2018

April 14, 2006April 14, 2006