Upper Midwest Environmental Sciences Center
Table 7. Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating-leaf vegetation in La Grange Pool, Illinois River, 2001.
| Common
name (Scientific name) |
Contiguous backwater n = 100 |
Isolated backwater n =129 |
Lake n = 57 |
|||
|
Freq
|
AI
|
Freq
|
AI
|
Freq
|
AI
|
|
| bladderwort, common (Utricularia macrorhiza) |
-
|
-
|
-
|
-
|
3.5 ± 2.5
|
0.5 ± 0.4
|
| chara (Chara spp.) |
-
|
-
|
-
|
-
|
5.3 ± 3.0
|
1.4 ± 0.9
|
| coontail (Ceratophyllum demersum) |
-
|
-
|
-
|
-
|
35.1 ± 6.4
|
6.1 ± 2.0
|
| pondweed, curly (Potamogeton crispus) |
-
|
-
|
-
|
-
|
1.8 ± 1.8
|
0.2 ± 0.2
|
| pondweed, horned (Zannichellia palustris) |
-
|
-
|
-
|
-
|
5.3 ± 3.0
|
0.6 ± 0.4
|
| pondweed, leafy (Potamogeton foliosus) |
-
|
-
|
-
|
-
|
1.8 ± 1.8
|
0.3 ± 0.3
|
| pondweed, longleaf (P. nodosus) |
-
|
-
|
-
|
-
|
1.8 ± 1.8
|
0.1 ± 0.1
|
| pondweed, sago (P. pectinatus) |
-
|
-
|
-
|
-
|
5.3 ± 3.0
|
0.6 ± 0.4
|
| watermilfoil, Eurasian (Myriophyllum spicatum) |
-
|
-
|
-
|
-
|
61.4 ± 6.5
|
11.6 ± 1.5
|
| watermilfoil, northern (M. sibiricum) |
-
|
-
|
-
|
-
|
43.9 ± 6.6
|
11.7 ± 2.4
|
| waternymph, brittle (Najas minor) |
-
|
-
|
-
|
-
|
3.5 ± 2.5
|
0.5 ± 0.4
|
| waternymph, nodding (N. flexilis) |
-
|
-
|
-
|
-
|
5.3 ± 3.0
|
1.4 ± 0.9
|
| all submersed species |
-
|
-
|
-
|
-
|
77.2 ± 5.6
|
21.9 ± 2.8
|
|
Freq
|
Cover
|
Freq
|
Cover
|
Freq
|
Cover
|
|
| lotus, American (Nelumbo lutea) |
1.0 ± 1.0
|
0.5 ± 0.5
|
-
|
-
|
19.3 ± 5.3
|
6.8 ± 2.2
|
| waterlily, white (Nymphaea odorata) |
-
|
-
|
-
|
-
|
12.3 ± 4.4
|
5.4 ± 2.7
|
| all rooted floating–leaf species |
1.0 ± 1.0
|
0.5 ± 0.5
|
-
|
-
|
28.1 ± 6.0
|
11.9 ± 3.3
|
Table 7. Continued.
|
Common name
(Scientific name) |
Main channel border
n = 78 |
Secondary channel
n = 50 |
La Grange
Pool* n = 357 |
|||
|
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) |
-
|
-
|
-
|
-
|
-
|
-
|
| 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) |
-
|
-
|
-
|
-
|
0.3 ± 0.3
|
0.1 ± 0.1
|
| waterlily, white (Nymphaea odorata) |
-
|
-
|
-
|
-
|
-
|
-
|
| all rooted floating–leaf species |
-
|
-
|
-
|
-
|
0.3 ± 0.3
|
0.1 ± 0.1
|
Page Last Modified: April 17, 2018