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.
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