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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

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