Table 6. Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating-leaf vegetation in Pool 26, Upper Mississippi River System, 2001.
| Common
name (Scientific name) |
Contiguous backwater n = 80 |
Isolated backwater, Illinois River n = 94 |
Isolated backwater, Mississippi River n = 60 |
|||
|
Freq
|
AI
|
Freq
|
AI
|
Freq
|
AI
|
|
| coontail (Ceratophyllum demersum) |
-
|
-
|
3.2 ± 1.8
|
0.2 ± 0.1
|
-
|
-
|
| pondweed, curly (Potamogeton crispus) |
-
|
-
|
1.1 ± 1.1
|
0.1 ± 0.1
|
-
|
-
|
| pondweed, longleaf (P. nodosus) |
-
|
-
|
2.1 ± 1.5
|
0.3 ± 0.2
|
-
|
-
|
| pondweed, sago (P. pectinatus) |
-
|
-
|
2.1 ± 1.5
|
0.3 ± 0.2
|
-
|
-
|
| waternymph, southern (Najas guadalupensis) |
-
|
-
|
1.1 ± 1.1
|
0.2 ± 0.2
|
-
|
-
|
| waterweed, Canadian (Elodea canadensis) |
-
|
-
|
1.1 ± 1.1
|
0.1 ± 0.1
|
-
|
-
|
| all submersed species |
-
|
-
|
6.4 ± 2.5
|
0.8 ± 0.3
|
-
|
-
|
|
Freq
|
Cover
|
Freq
|
Cover
|
Freq
|
Cover
|
|
| lotus, American (Nelumbo lutea) |
2.5 ± 1.8
|
0.5 ± 0.4
|
8.5 ± 2.9
|
3.8 ± 1.5
|
-
|
-
|
| primrose-willow, floating (Ludwigia peploides) |
-
|
-
|
5.3 ± 2.3
|
0.7 ± 0.4
|
1.7 ± 1.7
|
0.2 ± 0.2
|
| all rooted floating–leaf species |
2.5 ± 1.8
|
0.5 ± 0.4
|
10.6 ± 3.2
|
4.3 ± 1.6
|
1.7 ± 1.7
|
0.2 ± 0.2
|
Table 6. Continued.
| Common
name (Scientific name) |
Impounded n = 40 |
Main channel
border, Illinois River n = 40 |
Main channel
border, Mississippi River n = 49 |
|||
|
Freq
|
AI
|
Freq
|
AI
|
Freq
|
AI
|
|
| coontail (Ceratophyllum demersum) |
-
|
-
|
-
|
-
|
-
|
-
|
| pondweed, curly (Potamogeton crispus) |
-
|
-
|
-
|
-
|
-
|
-
|
| 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) |
-
|
-
|
-
|
-
|
-
|
-
|
| all rooted floating–leaf species |
-
|
-
|
-
|
-
|
-
|
-
|
Table 6. Continued.
|
Common name
(Scientific name) |
Secondary channel
n = 50 |
Pool 26
n = 413 |
||
|
Freq
|
AI
|
Freq
|
AI
|
|
| coontail (Ceratophyllum demersum) |
-
|
-
|
1.2 ± 0.7
|
0.1 ± <0.1
|
| pondweed, curly (Potamogeton crispus) |
-
|
-
|
0.4 ± 0.4
|
<0.1 ± <0.1
|
| pondweed, longleaf (P. nodosus) |
-
|
-
|
0.8 ± 0.6
|
0.1 ± 0.1
|
| pondweed, sago (P. pectinatus) |
-
|
-
|
0.8 ± 0.6
|
0.1 ± 0.1
|
| waternymph, southern (Najas guadalupensis) |
-
|
-
|
0.4 ± 0.4
|
0.1 ± 0.1
|
| waterweed, Canadian (Elodea canadensis) |
-
|
-
|
0.4 ± 0.4
|
<0.1 ± <0.1
|
| all submersed species |
-
|
-
|
2.4 ± 1.0
|
0.3 ± 0.1
|
|
Freq
|
Cover
|
Freq
|
Cover
|
|
| lotus, American (Nelumbo lutea) |
-
|
-
|
3.3 ± 1.1
|
1.5 ± 0.5
|
| primrose-willow, floating
(Ludwigia peploides) |
-
|
-
|
2.1 ± 0.9
|
0.3 ± 0.1
|
| all rooted floating–leaf species |
-
|
-
|
4.2 ± 1.2
|
1.6 ± 0.6
|
Page Last Modified: April 17, 2018