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Vegetation - Stratified Random Sampling 2002

Table 4.  Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating-leaf vegetation in Pool 7, Upper Mississippi River System, 2002.

Common name
(Scientific name)
 Contiguous 
backwater
n = 102		 Impounded
n = 171
Freq
AI
Freq
AI
 bladderwort, common (Utricularia macrorhiza)
3.9 ± 1.9
0.3 ± 0.2
-
-
 buttercup 
(Ranunculus spp.)
-
-
0.6 ± 0.6
<0.1 ± <0.1
 chara 
(Chara spp.) 
 10.8 ± 3.1 
1.2 ± 0.4
2.3 ± 1.2
0.3 ± 0.2
 coontail
(Ceratophyllum demersum) 
86.3 ± 3.4
15.8 ± 0.9
 26.3 ± 3.4 
4.0 ± 0.6
 pondweed, curly
(Potamogeton crispus) 
10.8 ± 3.1
0.9 ± 0.3
2.3 ± 1.2
0.2 ± 0.1 
 pondweed, flatstem
(P. zosteriformis) 
54.9 ± 5.0 
7.6 ± 0.8
14.0 ± 2.7
1.3 ± 0.3
 pondweed, leafy/small  (Potamogeton foliosus/pusillus) 
 30.4 ± 4.6
3.1 ± 0.5
10.5 ± 2.4
1.1 ± 0.3
 pondweed, longleaf
(P. nodosus) 
9.8 ± 3.0
1.0 ± 0.3
1.2 ± 0.8
0.1 ± 0.1
 pondweed, Richardson's 
(P. richardsonii) 
3.9 ± 1.9
0.3 ± 0.2
11.7 ± 2.5
1.0 ± 0.2
 pondweed, sago 
(P. pectinatus) 
3.9 ± 1.9
0.5 ± 0.2
8.2 ± 2.1
0.7 ± 0.2
 stargrass, water 
(Heteranthera dubia) 
28.4 ± 4.5
3.0 ± 0.5
28.1 ± 3.4
3.5 ± 0.5
 watermilfoil, Eurasian 
(Myriophyllum spicatum) 
43.1 ± 4.9
5.6 ± 0.7
20.5 ± 3.1
2.4 ± 0.4
 waternymph, nodding
(Najas flexilis) 
12.7 ± 3.3
1.2 ± 0.3
5.3 ± 1.7
0.5 ± 0.2
 waterweed, Canadian
(Elodea canadensis) 
76.5 ± 4.2
12.0 ± 0.8
26.9 ± 3.4
3.5 ± 0.5
 wildcelery 
(Vallisneria americana) 
33.3 ± 4.7
3.8 ± 0.6
53.8 ± 3.8
11.3 ± 0.9
 
all submersed species 
90.2 ± 3.0
18.9 ± 0.9
60.2 ± 3.8
13.3 ± 0.9
 
Freq 
Cover 
Freq 
Cover 
 lotus, American
(Nelumbo lutea) 
18.6 ± 3.9
4.6 ± 1.4
7.0 ± 2.0
1.9 ± 0.7
 pond-lily, yellow 
(Nuphar variegata) 
1.0 ± 1.0
0.1 ± 0.1
-
-
 waterlily, white 
(Nymphaea odorata) 
23.5 ± 4.2
5.1 ± 1.3
8.2 ± 2.1
1.4 ± 0.5
 
all rooted floating-leaf species 
37.3 ± 4.8
9.2 ± 1.8
12.3 ± 2.5
3.0 ± 0.9

Table 4. Continued.
Common name
(Scientific name)		 Main channel 
border
n = 71		 Secondary 
channel
n = 48		 Pool 7 
n = 392
Freq 
AI 
Freq 
AI 
Freq 
AI 
 bladderwort, common 
(Utricularia macrorhiza)
-
-
-
-
0.6 ± 0.3
0.1 ± <0.1
 buttercup
(Ranunculus spp.)
-
-
-
-
0.4 ± 0.4
<0.1 ± <0.1
 chara 
(Chara spp.)
-
-
-
-
3.2 ± 0.9
0.4 ± 0.1
 coontail 
(Ceratophyllum demersum) 
1.4 ± 1.4
0.1 ± 0.1
 16.7 ± 5.4 
2.5 ± 0.9
 32.4 ± 2.4 
5.3 ± 0.4
 pondweed, curly 
(Potamogeton crispus) 
-
-
-
-
3.2 ± 0.9
0.3 ± 0.1
 pondweed, flatstem 
(P. zosteriformis)
-
-
12.5 ± 4.8
1.8 ± 0.7
19.0 ± 2.0
2.2 ± 0.2
 pondweed, leafy/small 
(Potamogeton foliosus/pusillus) 
-
-
-
-
11.6 ± 1.7
1.2 ± 0.2
 pondweed, longleaf 
(P. nodosus) 
-
-
2.1 ± 2.1
0.2 ± 0.2
2.5 ± 0.7
0.2 ± 0.1
 pondweed, Richardson's 
(P. richardsonii) 
-
-
-
-
8.5 ± 1.7
0.8 ± 0.2
 pondweed, sago 
(P. pectinatus) 
-
-
2.1 ± 2.1
0.1 ± 0.1
6.4 ± 1.5
0.6 ± 0.1
 stargrass, water 
(Heteranthera dubia) 
  4.2 ± 2.4  
0.4 ± 0.3
12.5 ± 4.8
2.2 ± 0.9
24.9 ± 2.5
3.1 ± 0.4
 watermilfoil, Eurasian 
(Myriophyllum spicatum) 
1.4 ± 1.4
0.1 ± 0.1
6.3 ± 3.5
0.7 ± 0.4
21.0 ± 2.3
2.5 ± 0.3
 waternymph, nodding 
(Najas flexilis) 
-
-
-
-
5.4 ± 1.3
0.5 ± 0.1
 waterweed, Canadian 
(Elodea canadensis) 
-
-
18.8 ± 5.7
2.6 ± 0.9
31.6 ± 2.5
4.4 ± 0.4
 wildcelery 
(Vallisneria americana) 
5.6 ± 2.8
0.8 ± 0.4
14.6 ± 5.1
2.0 ± 0.8
43.5 ± 2.8
8.5 ± 0.6

 all submersed species 
7.0 ± 3.1
0.9 ± 0.4
25.0 ± 6.3
4.7 ± 1.3
57.4 ± 2.7
12.4 ± 0.7
 
Freq 
Cover
Freq 
Cover 
Freq 
Cover 
 lotus, American 
(Nelumbo lutea) 
-
-
4.2 ± 2.9
3.8 ± 2.6
8.0 ± 1.5
2.4 ± 0.6
 pond-lily, yellow 
(Nuphar variegata) 
-
-
-
-
0.1 ± 0.1
<0.1 ± <0.1
 waterlily, white 
(Nymphaea odorata) 
-
-
2.1 ± 2.1
1.9 ± 1.9
9.2 ± 1.6
1.9 ± 0.4

 all rooted floating-leaf species 
-
-
6.3 ± 3.5
5.6 ± 3.2
14.4 ± 1.9
4.0 ± 0.7

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