Upper Midwest Environmental Sciences Center

Table 9.  Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating–leaf vegetation in Pool 4, Upper Mississippi River System, 2002.
Vegetation - Stratified Random Sampling 2002

Table 9.  Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating-leaf vegetation in La Grange Pool, Illinois River, 2002.

Common name
(Scientific name) 		 Contiguous 
backwater
n =100 		 Isolated
backwater
n = 139		 Lake
n = 59
Freq 
AI 
Freq 
AI 
Freq 
AI 
 bladderwort, common 
(Utricularia macrorhiza) 
-
-
-
-
 11.9 ± 4.2
1.1 ± 0.4
 chara 
(Chara spp.) 
-
-
-
-
11.9 ± 4.2
1.4 ± 0.5
 coontail 
(Ceratophyllum demersum) 
-
-
-
-
57.6 ± 6.5
10.2 ± 1.9
 pondweed, curly 
(Potamogeton crispus) 
-
-
-
-
5.1 ± 2.9
0.4 ± 0.2
 pondweed, horned 
(Zannichellia palustris) 
-
-
-
-
6.8 ± 3.3
0.8 ± 0.4
 pondweed, leafy 
(Potamogeton foliosus) 
-
-
-
-
8.5 ± 3.7
0.8 ± 0.3
 pondweed, longleaf 
(P. nodosus) 
-
-
-
-
5.1 ± 2.9
0.9 ± 0.5
 pondweed, sago 
(P. pectinatus) 
-
-
-
-
6.8 ± 3.3
0.7 ± 0.4
 stargrass, water
(Heteranthera dubia)
-
-
-
-
3.4 ± 2.4
0.5 ± 0.3
 watermilfoil, Eurasian 
(Myriophyllum spicatum) 
-
-
-
-
72.9 ± 5.8
18.0 ± 2.4
 watermilfoil, northern 
(M. sibiricum) 
-
-
-
-
10.2 ± 4.0
1.3 ± 0.6
 waternymph, brittle 
(Najas minor) 
-
-
-
-
8.5 ± 3.7
1.2 ± 0.6
 waternymph, nodding 
(N. flexilis) 
-
-
-
-
10.2 ± 4.0
1.1 ± 0.5

 all submersed species 
-
-
-
-
79.7 ± 5.3
21.5 ± 2.7
 
Freq 
Cover 
Freq 
Cover 
Freq 
Cover 
 lotus, American 
(Nelumbo lutea) 
3.0 ± 1.7
0.3 ± 0.2
1.4 ± 1.0
0.1 ± 0.1
25.4 ± 5.7
10.3 ± 3.0
 primrose-willow, wingleaf
(Ludwigia decurrens)
1.0 ± 1.0
0.3 ± 0.3
-
-
-
-
waterlily, white 
(Nymphaea odorata) 
-
-
-
-
13.6 ± 4.5
7.8 ± 3.2

 all rooted floating-leaf species 
4.0 ± 2.0
0.6 ± 0.3
1.4 ± 1.0
0.1 ± 0.1
37.3 ± 6.3
18.0 ± 4.0

Table 9. Continued.
 
Common name
(Scientific name)
Main channel
border
n = 80
Secondary 
channel
n = 50
La Grange
Pool*
n = 369
Freq 
AI 
Freq 
AI 
Freq 
AI 
 bladderwort, common 
(Utricularia macrorhiza) 
-
-
-
-
-
-
 chara 
(Chara spp.) 
-
-
-
-
-
-
 coontail 
(Ceratophyllum demersum) 
-
-
-
-
-
-
 pondweed, curly 
(Potamogeton crispus) 
-
-
-
-
-
-
 pondweed, horned 
(Zannichellia palustris) 
-
-
-
-
-
-
 pondweed, leafy 
(Potamogeton foliosus) 
-
-
-
-
-
-
 pondweed, longleaf 
(P. nodosus) 
-
-
-
-
-
-
 pondweed, sago 
(P. pectinatus) 
-
-
-
-
-
-
 stargrass, water
(Heteranthera dubia)
-
-
-
-
-
-
 watermilfoil, Eurasian 
(Myriophyllum spicatum) 
-
-
-
-
-
-
 watermilfoil, northern 
(M. sibiricum) 
-
-
-
-
-
-
 waternymph, brittle 
(Najas minor) 
-
-
-
-
-
-
 waternymph, nodding 
(N. flexilis) 
-
-
-
-
-
-

 all submersed species 
-
-
-
-
-
-
 
Freq 
Cover 
Freq 
Cover 
Freq 
Cover 
 lotus, American 
(Nelumbo lutea) 
2.5 ± 1.8
0.3 ± 0.2
-
-
1.9 ± 0.8
0.2 ± 0.1
 primrose-willow, wingleaf
(Ludwigia decurrens)
-
-
-
-
0.3 ± 0.3
 0.1 ± 0.1
 waterlily, white 
(Nymphaea odorata) 
-
-
-
-
-
-

 all rooted floating-leaf species 
2.5 ± 1.8
0.3 ± 0.2
-
-
2.2 ± 0.8
0.3 ± 0.1

* Lakes are not influenced by the Illinois River and, therefore, were not included in the La Grange Pool percent frequency and abundance index. April 14, 2006
Page Last Modified: April 17, 2018