Upper Midwest Environmental Sciences Center

Table 5.  Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating–leaf vegetation in Pool 8, Upper Mississippi River System, 2002.
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Vegetation - Stratified Random Sampling 2002

Table 5.  Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating-leaf vegetation in Pool 8, Upper Mississippi River System, 2002.

Common name
(Scientific name)		 Contiguous 
backwater
n = 174		 Isolated 
backwater
n = 26		 Impounded
n = 224
Freq 
AI 
Freq 
AI 
Freq 
AI 
 bladderwort, common 
(Utricularia macrorhiza)
2.9 ± 1.3
0.4 ± 0.2
3.8 ± 3.8
0.3 ± 0.3
-
-
 chara 
(Chara spp.) 
1.7 ± 1.0
0.2 ± 0.1
-
-
-
-
 coontail 
(Ceratophyllum demersum) 
 54.0 ± 3.8 
8.5 ± 0.7
88.5 ± 6.4
21.5 ± 3.1
 14.7 ± 2.4 
2.4 ± 0.4
 pondweed, curly 
(Potamogeton crispus) 
25.9 ± 3.3
3.3 ± 0.5
26.9 ± 8.9
3.0 ± 1.1
3.6 ± 1.2
0.3 ± 0.1
 pondweed, flatstem 
(P. zosteriformis) 
23.6 ± 3.2
2.8 ± 0.4
7.7 ± 5.3
0.7 ± 0.5
0.4 ± 0.4
<0.1 ± <0.1 
 pondweed, horned 
(Zannichellia palustris) 
-
-
-
-
-
-
 pondweed, leafy/small 
(Potamogeton foliosus/pusillus) 
25.9 ± 3.3
3.1 ± 0.4
57.7 ± 9.9
7.3 ± 1.6
3.6 ± 1.2
0.4 ± 0.1
 pondweed, longleaf 
(P. nodosus) 
9.2 ± 2.2
1.2 ± 0.3
-
-
1.8 ± 0.9
0.2 ± 0.1
 pondweed, Richardson's 
(P. richardsonii) 
-
-
-
-
0.9 ± 0.6
0.1 ± <0.1
 pondweed, sago 
(P. pectinatus) 
25.9 ± 3.3 
2.8 ± 0.4
19.2 ± 7.9
2.0 ± 0.9
10.3 ± 2.0
1.3 ± 0.3
 stargrass, water 
(Heteranthera dubia) 
25.9 ± 3.3
3.4 ± 0.5
-
-
37.5 ± 3.2
5.4 ± 0.5
 watermilfoil, Eurasian 
(Myriophyllum spicatum) 
27.6 ± 3.4
3.5 ± 0.5
-
-
17.0 ± 2.5
1.9 ± 0.3
 waternymph, nodding 
(Najas flexilis) 
4.0 ± 1.5
0.4 ± 0.2
7.7 ± 5.3
0.8 ± 0.5
0.4 ± 0.4
<0.1 ± <0.1
 waterweed, Canadian 
(Elodea canadensis) 
54.6 ± 3.8
8.9 ± 0.7
46.2 ± 10.0
8.4 ± 2.3
22.8 ± 2.8
3.8 ± 0.6
 wildcelery 
(Vallisneria americana) 
8.6 ± 2.1
0.9 ± 0.2
-
-
30.8 ± 3.1
5.0 ± 0.6

 all submersed species 
76.4 ± 3.2
14.8 ± 0.8
88.5 ± 6.4
23.6 ± 3.4
47.3 ± 3.3
9.3 ± 0.8
 
Freq 
Cover 
Freq 
Cover 
Freq 
Cover 
 lotus, American 
(Nelumbo lutea) 
8.0 ± 2.1
1.3 ± 0.4
-
-
7.6 ± 1.8
1.6 ± 0.5
 pond-lily, yellow 
(Nuphar variegata) 
3.4 ± 1.4
0.6 ± 0.3
3.8 ± 3.8
1.9 ± 1.9
-
-
 waterlily, white 
(Nymphaea odorata) 
29.3 ± 3.5
10.1 ± 1.7
65.4 ± 9.5
38.1 ± 8.3
2.2 ± 1.0
0.5 ± 0.3

 all rooted floating-leaf species 
36.2 ± 3.7
11.8 ± 1.8
65.4 ± 9.5
40.4 ± 8.3
8.5 ± 1.9
1.9 ± 0.6

Table 5. Continued.

Common name
(Scientific name)		 Main channel 
border
n = 100		 Secondary 
channel
n = 120		 Pool 8
n = 644
Freq 
AI 
Freq 
AI 
Freq 
AI 
 bladderwort, common 
(Utricularia macrorhiza)
-
-
-
-
1.0 ± 0.4
0.1 ± <0.1
chara 
(Chara spp.) 
-
-
-
-
0.5 ± 0.3
<0.1 ± <0.1
 coontail 
(Ceratophyllum demersum) 
3.0 ± 1.7
0.3 ± 0.2
 13.3 ± 3.1 
1.6 ± 0.4
 28.0 ± 1.7 
4.6 ± 0.3
 pondweed, curly 
(Potamogeton crispus) 
2.0 ± 1.4
0.1 ± 0.1
3.3 ± 1.6
0.3 ± 0.2
10.6 ± 1.2
1.3 ± 0.2
 pondweed, flatstem 
(P. zosteriformis) 
-
-
4.2 ± 1.8
0.4 ± 0.2
7.7 ± 1.0
0.9 ± 0.1
 pondweed, horned 
(Zannichellia palustris) 
-
-
0.8 ± 0.8
0.1 ± 0.1
0.1 ± 0.1
<0.1 ± <0.1
 pondweed, leafy/small 
(Potamogeton foliosus/pusillus) 
1.0 ± 1.0
0.1 ± 0.1
5.8 ± 2.1
0.7 ± 0.3
12.1 ± 1.2
1.4 ± 0.2
 pondweed, longleaf 
(P. nodosus) 
-
-
2.5 ± 1.4
0.5 ± 0.3
3.8 ± 0.8
0.5 ± 0.1
 pondweed, Richardson's 
(P. richardsonii) 
-
-
-
-
0.4 ± 0.3
<0.1 ± <0.1
 pondweed, sago 
(P. pectinatus) 
 11.0 ± 3.1 
1.7 ± 0.5
6.7 ± 2.3
0.7 ± 0.2
14.5 ± 1.5
1.6 ± 0.2
 stargrass, water 
(Heteranthera dubia) 
9.0 ± 2.9
1.3 ± 0.4
13.3 ± 3.1
1.4 ± 0.4
28.3 ± 1.9
3.9 ± 0.3
 watermilfoil, Eurasian 
(Myriophyllum spicatum) 
1.0 ± 1.0
0.1 ± 0.1
4.2 ± 1.8
0.5 ± 0.2
16.9 ± 1.6
2.0 ± 0.2
 waternymph, nodding 
(Najas flexilis) 
-
-
-
-
1.6 ± 0.5
0.2 ± 0.1
 waterweed, Canadian 
(Elodea canadensis) 
4.0 ± 2.0
0.6 ± 0.3
16.7 ± 3.4
2.3 ± 0.5
31.0 ± 1.9
5.1 ± 0.4
 wildcelery 
(Vallisneria americana) 
6.0 ± 2.4
0.9 ± 0.4
8.3 ± 2.5
1.0 ± 0.4
19.3 ± 1.7
2.9 ± 0.3

 all submersed species 
17.0 ± 3.8
2.9 ± 0.7
29.2 ± 4.2
4.5 ± 0.7
53.4 ± 2.0
10.5 ± 0.5
 
Freq 
Cover
Freq 
Cover 
Freq 
Cover 
 lotus, American 
(Nelumbo lutea) 
4.0 ± 2.0
2.4 ± 1.4
5.0 ± 2.0
1.3 ± 0.8
6.9 ± 1.1
1.4 ± 0.3
 pond-lily, yellow 
(Nuphar variegata) 
-
-
-
-
1.1 ± 0.4
0.2 ± 0.1
 waterlily, white 
(Nymphaea odorata) 
-
-
5.8 ± 2.1
0.8 ± 0.3
12.7 ± 1.2
4.6 ± 0.6

 all rooted floating-leaf species 
4.0 ± 2.0
2.4 ± 1.4
7.5 ± 2.4
1.8 ± 0.8
18.1 ± 1.5
6.2 ± 0.7

Page Last Modified: April 17, 2018