Upper Midwest Environmental Sciences Center

Table 6.  Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating–leaf vegetation in Pool 4, Upper Mississippi River System, 1999.
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Vegetation - Stratified Random Sampling 2000

Table 6.  Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating-leaf vegetation in La Grange Pool, Illinois River, 2000.

Common name
(Scientific name)
Contiguous
backwater
n = 100
Isolated
backwater
n = 138
Lake
n = 57
Freq
AI
Freq
AI
Freq
AI
bladderwort, common (Utricularia macrorhiza)
-
-
-
-
3.5 ± 2.5
0.5 ± 0.4
chara (Chara spp.)
-
-
-
-
3.5 ± 2.5
0.4 ± 0.3
coontail (Ceratophyllum demersum)
-
-
-
-
28.1 ± 6.0
7.0 ± 2.5
pondweed, horned (Zannichellia palustris)
-
-
-
-
1.8 ± 1.8
0.2 ± 0.2
pondweed, sago (Potamogeton pectinatus)
-
-
-
-
8.8 ± 3.8
0.7 ± 0.3
watermilfoil, Eurasian, (Myriophyllum spicatum)
-
-
-
-
63.2 ± 6.4
18.6 ± 3.0
watermilfoil, northern (M. sibiricum)
-
-
-
-
45.6 ± 6.7
9.0 ± 1.6
waternymph, brittle (Najas minor)
-
-
-
-
3.5 ± 2.5
0.3 ± 0.2
waternymph, southern (N. guadalupensis)
-
-
-
-
1.8 ± 1.8
0.1 ± 0.1

all submersed species
-
-
-
-
80.7 ± 5.3
26.8 ± 3.4
 
Freq
Cover
Freq
Cover
Freq
Cover
lotus, American (Nelumbo lutea)
1.0 ± 1.0
0.3 ± 0.3
9.4 ± 2.5
0.9 ± 0.2
22.8 ± 5.6
8.9 ± 2.6
primrose-willow (Ludwigia spp.)
-
-
-
-
1.8 ± 1.8
0.5 ± 0.5
waterlily, white (Nymphaea odorata)
-
-
-
-
14.0 ± 4.6
6.3 ± 2.6

all rooted floating–leaf species
1.0 ± 1.0
0.3 ± 0.3
9.4 ± 2.5
0.9 ± 0.2
33.3 ± 6.3
17.0 ± 3.7

Table 6. Continued.

Common name
(Scientific name)
Main channel
border
n = 80
Secondary
channel
n = 50
La Grange
Pool*
n = 368
Freq
AI
Freq
AI
Freq
AI
bladderwort, common (Utricularia macrorhiza)
-
-
-
-
-
-
chara (Chara spp.)
-
-
-
-
-
-
coontail (Ceratophyllum demersum)
-
-
-
-
-
-
pondweed, horned(Zannichellia palustris)
-
-
-
-
-
-
pondweed, sago (Potamogeton pectinatus)
-
-
-
-
-
-
watermilfoil, Eurasian, (Myriophyllum spicatum)
-
-
-
-
-
-
watermilfoil, northern (M. sibiricum)
-
-
-
-
-
-
waternymph, brittle (Najas minor)
-
-
-
-
-
-
waternymph, southern (N. guadalupensis)
-
-
-
-
-
-

all submersed species
-
-
-
-
-
-
 
Freq
Cover
Freq
Cover
Freq
Cover
lotus, American (Nelumbo lutea)
-
-
-
-
6.0 ± 1.5
0.7 ± 0.2
primrose-willow (Ludwigia spp.)
-
-
-
-
-
-
waterlily, white (Nymphaea odorata)
-
-
-
-
-
-

all rooted floating–leaf species
-
-
-
-
6.0 ± 1.5
0.7 ± 0.2

*Lakes are not influenced by the Illinois River and, therefore, were not included in La Grange Pool percent frequency and abundance index.

Page Last Modified: April 17, 2018