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 4, Upper Mississippi River System, 1999.
Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Vegetation - Stratified Random Sampling 2000

Table 5.  Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating-leaf vegetation in Pool 26, Upper Mississippi River System, 2000.

Common name
(Scientific name)
Contiguous backwater
n = 80
Isolated
backwater,
Illinois River
n = 95
Isolated
backwater, Mississippi
River
n = 42
Freq
AI
Freq
AI
Freq
AI
coontail (Ceratophyllum demersum)
-
-
5.3 ± 2.3
0.8 ± 0.4
2.4 ± 2.4
0.2 ± 0.2
pondweed, leafy (Potamogeton foliosus)
-
-
1.1 ± 1.1
0.1 ± 0.1
-
-
pondweed, longleaf
(P. nodosus)
-
-
3.2 ± 1.8
0.4 ± 0.3
-
-
pondweed, sago
(P. pectinatus)
-
-
11.6 ± 3.3
2.1 ± 0.8
-
-
waternymph, southern (Najas guadalupensis)
-
-
7.4 ± 2.7
1.5 ± 0.6
-
-
waterweed, Canadian (Elodea canadensis)
-
-
3.2 ± 1.8
0.2 ± 0.1
-
-

all submersed species
-
-
14.7 ± 3.7
3.4 ± 1.0
2.4 ± 2.4
0.2 ± 0.2
 
Freq
Cover
Freq
Cover
Freq
Cover
lotus, American
(Nelumbo lutea)
8.8 ± 3.2
0.9 ± 0.3
5.3 ± 2.3
0.7 ± 0.4
-
-
primrose-willow, floating (Ludwigia peploides)
2.5 ± 1.8
0.3 ± 0.2
3.2 ± 1.8
0.3± 0.2
4.8 ± 3.3
1.0 ± 0.7

all rooted floating–leaf species
10.0 ± 3.4
1.0 ± 0.3
6.3 ± 2.5
0.8 ± 0.4
4.8 ± 3.3
1.0 ± 0.7

Table 5. Continued.

Common name
(Scientific name)
Impounded
n = 40
Main channel
border, Illinois River
n = 40
Main channel
border,
Mississippi
River
n = 50
Freq
AI
Freq
AI
Freq
AI
coontail (Ceratophyllum demersum)
-
-
-
-
-
-
pondweed, leafy (Potamogeton foliosus)
-
-
-
-
-
-
pondweed, longleaf
(P. nodosus)
-
-
-
-
-
-
pondweed, sago
(P. pectinatus)
-
-
-
-
-
-
waternymph, southern (Najas guadalupensis)
-
-
-
-
-
-
waterweed, Canadian (Elodea canadensis)
-
-
-
-
-
-

all submersed species
-
-
-
-
-
-
 
Freq
Cover
Freq
Cover
Freq
Cover
lotus, American
(Nelumbo lutea)
-
-
-
-
-
-
primrose-willow, floating (Ludwigia peploides)
2.5 ± 2.5
0.3 ± 0.3
-
-
-
-
all rooted floating–leaf species
2.5 ± 2.5
0.3 ± 0.3
-
-
-
-

Table 5. Continued.

Common name
(Scientific name)
Secondary
channel
n = 50
Pool 26
n = 397
Freq
AI
Freq
AI
coontail
(Ceratophyllum demersum)
-
-
2.1 ± 0.9
0.3 ± 0.1
pondweed, leafy (Potamogeton foliosus)
-
-
0.4 ± 0.4
0.1 ± 0.1
pondweed, longleaf
(P. nodosus)
-
-
1.2 ± 0.7
0.2 ± 0.1
pondweed, sago
(P. pectinatus)
-
-
4.3 ± 1.2
0.8 ± 0.3
waternymph, southern (Najas guadalupensis)
-
-
2.8 ± 1.0
0.6 ± 0.2
waterweed, Canadian (Elodea canadensis)
-
-
1.2 ± 0.7
0.1 ± <0.1

all submersed species
-
-
5.7 ± 1.4
1.3 ± 0.4
 
Freq
Cover
Freq
Cover
lotus, American
(Nelumbo lutea)
-
-
2.5 ± 0.9
0.3 ± 0.1
primrose-willow, floating (Ludwigia peploides)
-
-
1.7 ± 0.7
0.2 ± 0.1

all rooted floating–leaf species
-
-
3.3 ± 1.0
0.4 ± 0.2

Page Last Modified: April 17, 2018