Upper Midwest Environmental Sciences Center

Table 3.  Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating–leaf vegetation in Pool 4, Upper Mississippi River System, 1999.
Vegetation - Stratified Random Sampling 2001

Table 3.  Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating-leaf vegetation in Pool 8, Upper Mississippi River System, 2001.

Common name
(Scientific name)		 Contiguous backwater
n =175 		Isolated backwater
n = 50 		Impounded
n = 225
Freq
AI
Freq
AI
Freq
AI
bladderwort, common (Utricularia macrorhiza)
5.1 ± 1.7
0.5 ± 0.2
14.0 ± 5.0
1.4 ± 0.5
-
-
chara
(Chara spp.)
-
-
8.0 ± 3.9
0.8 ± 0.4
-
-
coontail 
(Ceratophyllum demersum)
63.4 ± 3.7
9.2 ± 0.7
92.0 ± 3.9
21.0 ± 1.8
11.1 ± 2.1
1.2 ± 0.3
pondweed, curly (Potamogeton crispus)
20.6 ± 3.1
2.0 ± 0.3
14.0 ± 5.0
1.9 ± 0.8
4.9 ± 1.4
0.6 ± 0.2
pondweed, flatstem (P. zosteriformis)
21.7 ± 3.1
2.5 ± 0.4
16.0 ± 5.2
1.5 ± 0.5
0.4 ± 0.4
<0.1± <0.1
pondweed, horned (Zannichellia palustris)
-
-
-
-
-
-
pondweed, leafy/small (Potamogeton foliosus/pusillus)
32.0 ± 3.5
3.9 ± 0.5
46.0 ± 7.1
6.9 ± 1.2
3.6 ± 1.2
0.4 ± 0.1
pondweed, longleaf (P. nodosus)
3.4 ± 1.4
0.4 ± 0.2
-
-
1.8 ± 0.9
0.2 ± 0.1
pondweed, Richardson's (P. richardsonii)
-
-
-
-
-
-
pondweed, sago 
(P. pectinatus)
28.6 ± 3.4
3.5 ± 0.5
20.0 ± 5.7
2.6 ± 0.8
13.3 ± 2.3
1.7 ± 0.3
stargrass, water (Heteranthera dubia)
16.6 ± 2.8
1.6 ± 0.3
4.0 ± 2.8
0.6 ± 0.4
25.3 ± 2.9
3.2 ± 0.4
watermilfoil, Eurasian  (Myriophyllum spicatum)
9.1 ± 2.2
0.8 ± 0.2
-
-
5.3 ± 1.5
0.6 ± 0.2
waternymph, nodding (Najas flexilis)
1.7 ± 1.0
0.2 ± 0.1
12.0 ± 4.6
1.4 ± 0.6
0.4 ± 0.4
0.1 ± 0.1
waterweed, Canadian (Elodea canadensis)
38.9 ± 3.7
4.4 ± 0.5
42.0 ± 7.1
7.5 ± 1.4
12.4 ± 2.2
1.8 ± 0.4
wildcelery (Vallisneria americana)
6.9 ± 1.9
0.7 ± 0.2
-
-
20.9 ± 2.7
3.1 ± 0.4

all submersed species
76.0 ± 3.2
12.6 ± 0.7
92.0 ± 3.9
21.8 ± 1.9
36.9 ± 3.2
5.8 ± 0.6
 
Freq
Cover
Freq
Cover
Freq
Cover
lotus, American 
(Nelumbo lutea)
9.1 ± 2.2
1.3 ± 0.4
2.0 ± 2.0
0.2 ± 0.2
4.0 ± 1.3
0.7 ± 0.3
pond-lily, yellow (Nuphar variegata)
2.9 ± 1.3
0.3 ± 0.1
6.0 ± 3.4
1.8 ± 1.4
-
-
waterlily, white (Nymphaea odorata)
24.0 ± 3.2
6.7 ± 1.2
70.0 ± 6.5
41.8 ± 5.4
2.7 ± 1.1
0.3 ± 0.1

all rooted floating–leaf species
39.7 ± 3.5
8.2 ± 1.3
72.0 ± 6.4
43.6 ± 5.3
6.2 ± 1.6
0.9 ± 0.3

Table 3. Continued.

Common name
(Scientific name)		 Main channel border
n =100 		Secondary channel
n =120 		Pool 8
n = 670
Freq
AI
Freq
AI
Freq
AI
bladderwort, common (Utricularia macrorhiza)
-
-
-
-
2.0 ± 0.5
0.2 ± 0.1
chara
(Chara spp.)
-
-
-
-
0.3 ± 0.1
<0.1± <0.1
coontail (Ceratophyllum demersum)
10.0 ± 3.0
0.9 ± 0.3
13.3 ± 3.1
1.7 ± 0.4
29.2 ± 1.5
4.3 ± 0.2
pondweed, curly (Potamogeton crispus)
2.0 ± 1.4
0.2 ± 0.1
4.2 ± 1.8
0.5 ± 0.2
9.4 ± 1.2
1.0 ± 0.1
pondweed, flatstem (P. zosteriformis)
1.0 ± 1.0
0.1 ± 0.1
4.2 ± 1.8
0.4 ± 0.2
7.6 ± 1.0
0.8 ± 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)
-
-
8.3 ± 2.5
1.1 ± 0.4
13.7 ± 1.3
1.7 ± 0.2
pondweed, longleaf
(P. nodosus)
-
-
2.5 ± 1.4
0.3 ± 0.2
2.2 ± 0.6
0.2 ± 0.1
pondweed, Richardson's (P. richardsonii)
1.0 ± 1.0
0.1 ± 0.1
-
-
<0.1 ± <0.1
<0.1± <0.1
pondweed, sago
(P. pectinatus)
12.0 ± 3.3
2.0 ± 0.7
10.0 ± 2.8
1.2 ± 0.4
17.3 ± 1.6
2.2 ± 0.2
stargrass, water (Heteranthera dubia)
7.0 ± 2.6
0.8 ± 0.3
7.5 ± 2.4
0.6 ± 0.2
18.8 ± 1.7
2.2 ± 0.2
watermilfoil, Eurasian  (Myriophyllum spicatum)
-
-
2.5 ± 1.4
0.2 ± 0.1
5.6 ± 1.0
0.6 ± 0.1
waternymph, nodding (Najas flexilis)
-
-
0.8 ± 0.8
0.2 ± 0.2
1.3 ± 0.4
0.2 ± 0.1
waterweed, Canadian (Elodea canadensis)
2.0 ± 1.4
0.1 ± 0.1
8.3 ± 2.5
0.9 ± 0.3
20.0 ± 1.6
2.6 ± 0.2
wildcelery
(Vallisneria americana)
7.0 ± 2.6
1.0 ± 0.4
7.5 ± 2.4
0.9 ± 0.3
13.7 ± 1.5
1.9 ± 0.2

all submersed species
24.0 ± 4.3
3.5 ± 0.8
22.5 ± 3.8
3.1 ± 0.6
47.5 ± 1.9
7.8 ± 0.4
 
Freq
Cover
Freq
Cover
Freq
Cover
lotus, American 
(Nelumbo lutea)
3.0 ± 1.7
1.9 ± 1.2
4.2 ± 1.8
0.4 ± 0.2
5.4 ± 0.9
0.8 ± 0.2
pond-lily, yellow (Nuphar variegata)
-
-
-
-
1.0 ± 0.4
0.1 ± 0.1
waterlily, white (Nymphaea odorata)
-
-
3.3 ± 1.6
0.3 ± 0.2
11.2 ± 1.1
3.7± 0.4

all rooted floating–leaf species
3.0 ± 1.7
1.9 ± 1.2
5.8 ± 2.1
0.6 ± 0.2
15.2 ± 1.3
4.6 ± 0.5

Page Last Modified: April 17, 2018