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Vegetation - Stratified Random Sampling 2002

Table 6.  Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating-leaf vegetation in Pool 12, Upper Mississippi River System, 2002.

Common name 
(Scientific name)		 Contiguous
backwater
n = 120		 Impounded
n = 81
Freq
AI
Freq
AI
 coontail  
(Ceratophyllum demersum) 
  25.8 ± 4.0 
3.2 ± 0.6
 14.8 ± 4.0 
1.4 ± 0.4
 pondweed, curly 
(Potamogeton crispus) 
0.8 ± 0.8
0.1 ± 0.1
2.5 ± 1.7
0.3 ± 0.2
 pondweed, leafy/small 
(Potamogeton foliosus/pusillus) 
0.8 ± 0.8
0.1 ± 0.1
3.7 ± 2.1
0.3 ± 0.1
 pondweed, longleaf 
(P. nodosus) 
6.7 ± 2.3
0.7 ± 0.3
14.8 ± 4.0
2.1 ± 0.7
 pondweed, sago 
(P. pectinatus) 
10.8 ± 2.8
1.1 ± 0.3
11.1 ± 3.5
1.4 ± 0.5
 stargrass, water 
(Heteranthera dubia) 
5.0 ± 2.0
0.4 ± 0.2
16.0 ± 4.1
2.3 ± 0.7
 watermilfoil, Eurasian 
(Myriophyllum spicatum) 
5.0 ± 2.0
0.5 ± 0.2
8.6 ± 3.1
1.1 ± 0.4
 waternymph, nodding 
(Najas flexilis) 
0.8 ± 0.8
0.2 ± 0.2
-
-
 waterweed, Canadian 
(Elodea canadensis) 
0.8 ± 0.8
0.1 ± 0.1
2.5 ± 1.7
0.2 ± 0.1
 wildcelery 
(Vallisneria americana) 
-
-
7.4 ± 2.9
1.5 ± 0.6
 
all submersed species 
33.3 ± 4.3
4.6 ± 0.7
27.2 ± 5.0
5.2 ± 1.2
 
Freq
Cover
Freq
Cover
 lotus, American 
(Nelumbo lutea) 
30.0 ± 4.2
17.2 ± 2.9
29.6 ± 5.1
22.2 ± 4.1
 waterlily, white 
(Nymphaea odorata) 
10.8 ± 2.8
3.3 ± 1.2
2.5 ± 1.7
0.5 ± 0.4
 
all rooted floating-leaf species 
35.0 ± 4.4
20.5 ± 3.2
30.9 ± 5.2
22.8 ± 4.1

Table 6. Continued.
Common name
(Scientific name)		 Main channel 
border
n = 153		 Secondary 
channel
n = 50		 Pool 12
n = 404
Freq 
AI 
Freq 
AI 
Freq 
AI 
 coontail 
(Ceratophyllum demersum) 
   0.7 ± 0.7 
<0.1 ± <0.1
   2.0 ± 2.0 
0.1 ± 0.1
   9.2 ± 1.3 
1.0 ± 0.2
 pondweed, curly 
(Potamogeton crispus) 
-
-
-
-
0.6 ± 0.3
0.1 ± <0.1
 pondweed, leafy/small 
(Potamogeton foliosus/pusillus) 
-
-
-
-
0.8 ± 0.4
0.1 ± <0.1
 pondweed, longleaf 
(P. nodosus) 
-
-
-
-
3.9 ± 0.8
0.4 ± 0.1
 pondweed, sago 
(P. pectinatus) 
2.6 ± 1.3
0.2 ± 0.1
6.0 ± 3.4
0.5 ± 0.3
6.7 ± 1.3
0.7 ± 0.1
 stargrass, water 
(Heteranthera dubia) 
2.0 ± 1.1
0.2 ± 0.1
-
-
4.4 ± 0.9
0.5 ± 0.1
 watermilfoil, Eurasian 
(Myriophyllum spicatum) 
0.7 ± 0.7
0.1 ± 0.1
-
-
2.8 ± 0.7
0.3 ± 0.1
 waternymph, nodding 
(Najas flexilis) 
-
-
-
-
0.2 ± 0.2
<0.1 ± <0.1
 waterweed, Canadian 
(Elodea canadensis) 
-
-
2.0 ± 2.0
0.1 ± 0.1
1.1 ± 0.6
0.1 ± <0.1
 wildcelery 
(Vallisneria americana) 
1.3 ± 0.9
0.2 ± 0.1
-
-
1.7 ± 0.6
0.3 ± 0.1

 all submersed species 
3.3 ± 1.4
0.5 ± 0.2
8.0 ± 3.9
0.6 ± 0.3
15.2 ± 1.7
2.2 ± 0.3
 
Freq 
Cover
Freq 
Cover 
Freq 
Cover 
 lotus, American 
(Nelumbo lutea) 
-
-
-
-
11.8 ± 1.3
7.6 ± 0.9
 waterlily, white 
(Nymphaea odorata) 
-
-
-
-
3.0 ± 0.7
0.8 ± 0.3

 all rooted floating-leaf species 
-
-
-
-
13.1 ± 1.3
8.4 ± 1.0

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