Upper Midwest Environmental Sciences Center

Table 4.  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 4.  Percent frequency,  abundance index (AI), cover, and standard errors of submersed and rooted floating–leaf vegetation in Pool 11, Upper Mississippi River System, 2001.

Common name
(Scientific name)		 Contiguous backwater
n =129		 Isolated
backwater
n = 15		 Impounded
n = 204
Freq
AI
Freq
AI
Freq
AI
chara
(Chara spp.)
-
-
13.3± 9.1
1.2 ± 0.8
-
-
coontail  (Ceratophyllum demersum)
20.2 ± 3.5
2.4 ± 0.5
73.3 ± 11.8
19.7 ± 6.2
3.9 ± 1.4
0.5 ± 0.2
pondweed, curly
(Potamogeton crispus)
0.8 ± 0.8
0.1 ± 0.1
-
-
1.5± 0.8
0.1 ± 0.1
pondweed, flatstem (P. zosteriformis)
0.8 ± 0.8
0.1 ± 0.1
6.7± 6.7
1.1 ± 1.1
1.0± 0.7
0.1 ± 0.1
pondweed, leafy/small (P. foliosus/pusillus)

2.3 ±1.3

0.2 ± 0.1
20.0 ± 10.7
2.2 ± 1.3
-
-
pondweed, longleaf
(P. nodosus)
1.6 ± 1.1
0.2 ± 0.2
6.7 ± 6.7
1.1 ± 1.1
0.5 ± 0.5
0.1 ± 0.1
pondweed, sago 
(P. pectinatus)
10.1 ± 2.7
1.1 ± 0.3
46.7 ± 13.3
6.0 ± 2.1
9.8 ± 2.1
1.4 ± 0.3
stargrass, water (Heteranthera dubia)
-
-
-
-
-
-
watermilfoil, Eurasian  (Myriophyllum spicatum)
1.6 ± 1.1
0.2 ± 0.1
6.7± 6.7
1.1 ± 1.1
1.5 ± 0.8
0.1 ± 0.1
waternymph, nodding (Najas flexilis)
-
-
13.3 ± 9.1
2.4 ± 1.8
-
-
waternymph, southern
(N. guadalupensis)
3.9 ± 1.7
0.5 ± 0.2
20.0 ± 10.7
2.8 ± 1.5
-
-
waterweed, Canadian (Elodea canadensis)
-
-
20.0 ± 10.7
2.3 ± 1.5
0.5 ± 0.5
<0.1 ± <0.1
wildcelery (Vallisneria americana)
0.8 ± 0.8
0.1 ± 0.1
-
-
2.0 ± 1.0
0.2 ± 0.1

all submersed species
26.4 ±3.9
3.5 ± 0.6
73.3 ± 11.8
21.8 ± 6.1
11.8 ± 2.3
1.9 ± 0.4
 
Freq
Cover
Freq
Cover
Freq
Cover
lotus, American
 (Nelumbo lutea)
16.3 ± 3.3
3.0 ± 0.9
26.7 ± 11.8
6.7 ± 4.6
3.4 ± 1.3
0.5 ± 0.2
pond-lily, yellow (Nuphar variegata)
0.8 ± 0.8
0.1 ± 0.1
-
-
-
-
waterlily, white (Nymphaea odorata)
13.2 ± 3.0
4.0 ± 1.1
33.3 ± 12.6
7.3 ± 3.7
0.5 ± 0.5
0.1 ± 0.1

all rooted floating–leaf species
20.9 ± 3.6
8.4 ± 1.7
46.7 ± 13.3
14.0 ± 5.9
3.4 ± 1.3
0.7 ± 0.3

Table 4. Continued.

Common name
(Scientific name)		 Main channel border
n =139		 Secondary channel
n =77		 Pool 11
n = 564
Freq
AI
Freq
AI
Freq
AI
chara
(Chara spp.)
-
-
-
-
0.3 ± 0.2
<0.1 ± <0.1
coontail  (Ceratophyllum demersum)
1.4 ± 1.0
0.2 ± 0.1
7.8 ± 3.1
1.0 ± 0.4
9.1 ± 1.1
1.4 ± 0.2
pondweed, curly
(Potamogeton crispus)
-
-
1.3 ± 1.3
0.1 ± 0.1
0.8 ± 0.3
0.1 ± <0.1
pondweed, flatstem (P. zosteriformis)
-
-
-
-
0.7 ± 0.3
0.1 ± <0.1
pondweed, leafy/small (P. foliosus/pusillus)
-
-
-
-
1.1 ± 0.4
0.1 ± <0.1
pondweed, longleaf
(P. nodosus)
-
-
1.3 ± 1.3
0.1 ± 0.1
0.8 ± 0.4
0.1 ± 0.1
pondweed, sago 
(P. pectinatus)

7.9 ± 2.3

1.0 ± 0.3
-
-
9.3 ± 1.2
1.2 ± 0.2
stargrass, water (Heteranthera dubia)
2.2 ± 1.2
0.1 ± 0.1
-
-
0.7 ± 0.4
<0.1 ± <0.1
watermilfoil, Eurasian  (Myriophyllum spicatum)
2.9 ± 1.4
0.3 ± 0.1
3.9 ± 2.2
0.3 ± 0.2
2.3 ± 0.7
0.2 ± 0.1
waternymph, nodding (Najas flexilis)
-
-
-
-
0.3 ± 0.2
0.1 ± <0.1
waternymph, southern
(N. guadalupensis)
-
-
-
-
1.4 ± 0.5
0.2 ± 0.1
waterweed, Canadian (Elodea canadensis)
0.7 ± 0.7
0.1 ± 0.1
-
-
0.9 ± 0.4
0.1 ± 0.1
wildcelery (Vallisneria americana)
3.6 ± 1.6
0.5 ± 0.2
1.3 ± 1.3
0.1 ± 0.1
2.1 ± 0.6
0.2 ± 0.1

all submersed species
10.8 ± 2.6
1.3 ± 0.4
9.1 ± 3.3
1.2 ± 0.5
16.3 ± 1.5
2.5 ± 0.3
 
Freq
Cover
Freq
Cover
Freq
Cover
lotus, American
 (Nelumbo lutea)
-
-
1.3 ± 1.3
0.1 ± 0.1
5.8 ± 0.9
1.1 ± 0.3
pond-lily, yellow (Nuphar variegata)
-
-
-
-
0.2 ± 0.2
<0.1 ± <0.1
waterlily, white (Nymphaea odorata)
-
-
2.6 ± 1.8
1.3 ± 1.0
4.4 ± 0.8
1.3 ± 0.3

all rooted floating–leaf species
-
-
2.6 ± 1.8
1.3 ± 1.0
7.5 ± 1.0
2.7 ± 0.5

Page Last Modified: April 17, 2018