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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

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