Table 2. Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating–leaf vegetation in Pool 4, Upper Mississippi River System, 1999.

Upper Midwest Environmental Sciences Center

Table 2. Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating-leaf vegetation in Pool 4, Upper Mississippi River System, 1999.

Common name
(Scientific name)

Contiguous
backwater, upper
n = 75

Contiguous
backwater, lower
n = 160

Isolated
backwater
n = 32

Freq

bladderwort, common (Utricularia macrorhiza)

0.6 ± 0.6

<0.1 ± <0.1

buttercup, longbeak (Ranunculus longirostris)

3.1 ± 3.1

0.4 ± 0.4

coontail
(Ceratophyllum demersum)

4.0 ± 2.3

0.6 ± 0.3

38.8 ± 3.9

5.2 ± 0.6

68.8 ± 8.3

14.0 ± 2.5

pondweed, curly (Potamogeton crispus)

1.3 ± 1.3

0.1 ± 0.1

15.6 ± 2.9

1.8 ± 0.4

12.5 ± 5.9

1.2 ± 0.6

pondweed, flatstem (P. zosteriformis)

10.0 ± 2.4

1.0 ± 0.2

12.5 ± 5.9

1.7 ± 0.9

pondweed, horned (Zannichellia palustris)

1.3 ± 0.9

0.2 ± 0.1

pondweed, leafy/small (Potamogeton foliosus/pusillus)

16.9 ± 3.0

1.9 ± 0.4

46.9 ± 9.0

6.4 ± 1.3

pondweed, longleaf (P. nodosus)

1.3 ± 1.3

0.2 ± 0.2

7.5 ± 2.1

0.9 ± 0.3

9.4 ± 5.2

1.0 ± 0.6

pondweed, ribbonleaf (P. epihydrus)

pondweed, sago (P. pectinatus)

26.7 ± 5.1

3.2 ± 0.7

10.0 ± 2.4

1.4 ± 0.4

75.0 ± 7.8

11.0 ± 1.4

stargrass, water (Heteranthera dubia)

32.5 ± 3.7

3.9 ± 0.5

3.1 ± 3.1

0.2 ± 0.2

watermilfoil, Eurasian (Myriophyllum spicatum)

26.3 ± 3.5

3.0 ± 0.4

waternymph, nodding (Najas flexilis)

4.4 ± 1.6

0.5 ± 0.2

15.6 ± 6.5

1.7 ± 0.8

waterweed, Canadian (Elodea canadensis)

1.3 ± 1.3

0.1 ± 0.1

40.0 ± 3.9

5.3 ± 0.6

21.9 ± 7.4

2.8 ± 1.0

wildcelery (Vallisneria americana)

30.6 ± 3.7

4.1 ± 0.5

all submersed species

29.3 ± 5.3

3.3 ± 0.6

66.3 ± 3.8

10.8 ± 0.7

81.3 ± 7.0

16.8 ± 2.3

Freq

Cover

Freq

Cover

Freq

Cover

lotus, American (Nelumbo lutea)

5.6 ± 1.8

0.9 ± 0.4

waterlily, white (Nymphaea odorata)

5.3 ± 2.6

1.1 ± 0.6

18.8 ± 3.1

3.8 ± 0.9

34.4 ± 8.5

4.1 ± 1.2

all rooted floating-leaf species

5.3 ± 2.6

1.1 ± 0.6

21.9 ± 3.3

4.4 ± 1.0

34.4 ± 8.5

4.1 ± 1.2

Table 2.

Common name
(Scientific name)

Lake Pepin,
upper
n = 65

Lake Pepin, lower
n = 35

Main channel border,
upper
n = 12

Freq

bladderwort, common (Utricularia macrorhiza)

buttercup, longbeak (Ranunculus longirostris)

coontail (Ceratophyllum demersum)

2.9 ± 2.9

0.3 ± 0.3

pondweed, curly (Potamogeton crispus)

pondweed, flatstem (P. zosteriformis)

pondweed, horned (Zannichellia palustris)

pondweed, leafy/small (Potamogeton foliosus/pusillus)

8.6 ± 4.8

0.6 ± 0.3

pondweed, longleaf (P. nodosus)

pondweed, ribbonleaf (P. epihydrus)

pondweed, sago (P. pectinatus)

16.9 ± 4.7

2.3 ± 0.7

2.9 ± 2.9

0.3 ± 0.3

16.7 ± 11.2

1.1 ± 0.8

stargrass, water (Heteranthera dubia)

2.9 ± 2.9

0.2 ± 0.2

watermilfoil, Eurasian (Myriophyllum spicatum)

waternymph, nodding (Najas flexilis)

8.6 ± 4.8

1.5 ± 0.8

waterweed, Canadian (Elodea canadensis)

8.6 ± 4.8

1.2 ± 0.7

wildcelery (Vallisneria americana)

5.7 ± 4.0

0.7 ± 0.5

all submersed species

16.9 ± 4.7

2.2 ± 0.6

8.6 ± 4.8

1.6 ± 0.9

16.7 ± 11.2

1.0 ± 0.7

Freq

Cover

Freq

Cover

Freq

Cover

lotus, American (Nelumbo lutea)

waterlily, white (Nymphaea odorata)

all rooted floating-leaf species

Table 2.

Common name
(Scientific name)

Main channel border, lower
n = 48

Secondary
channel, upper
n = 61

Secondary
channel, lower
n = 59

Freq

bladderwort, common
(Utricularia macrorhiza)

buttercup, longbeak (Ranunculus longirostris)

coontail (Ceratophyllum demersum)

2.1 ± 2.1

0.1 ± 0.1

20.3 ± 5.3

1.6 ± 0.4

pondweed, curly (Potamogeton crispus)

2.1 ± 2.1

0.1 ± 0.1

11.9 ± 4.2

1.4 ± 0.5

pondweed, flatstem (P. zosteriformis)

pondweed, horned (Zannichellia palustris)

6.3 ± 3.5

0.7 ± 0.4

1.7 ± 1.7

0.3 ± 0.3

pondweed, leafy/small (Potamogeton foliosus/pusillus)

5.1 ± 2.9

0.3 ± 0.2

pondweed, longleaf (P. nodosus)

8.5 ± 3.7

1.2 ± 0.6

pondweed, ribbonleaf (P. epihydrus)

1.7 ± 1.7

0.2 ± 0.2

pondweed, sago (P. pectinatus)

10.4 ± 4.5

1.4 ± 0.7

18.6 ± 5.1

2.4 ± 0.7

stargrass, water (Heteranthera dubia)

10.4 ± 4.5

0.9 ± 0.4

10.2 ± 4.0

1.1 ± 0.5

watermilfoil, Eurasian (Myriophyllum spicatum)

8.5 ± 3.7

0.8 ± 0.4

waternymph, nodding (Najas flexilis)

waterweed, Canadian (Elodea canadensis)

4.2 ± 2.9

0.3 ± 0.2

18.6 ± 5.1

2.0 ± 0.6

wildcelery (Vallisneria americana)

10.4 ± 4.5

1.3 ± 0.6

20.3 ± 5.3

2.8 ± 0.8

all submersed species

20.8 ± 5.9

2.4 ± 0.8

37.3 ± 6.3

5.2 ± 1.0

Freq

Cover

Freq

Cover

Freq

Cover

lotus, American (Nelumbo lutea)

waterlily, white (Nymphaea odorata)

1.7 ± 1.7

0.8 ± 0.8

all rooted floating-leaf species

1.7 ± 1.7

0.8 ± 0.8

Table 2.

Common name
(Scientific name)

Pool 4, upper
n = 213

Pool 4, lower
n = 302

Pool 4
n = 547

Freq

bladderwort, common
(Utricularia macrorhiza)

0.4 ± 0.6

<0.1 ± <0.1

0.2 ± 0.5

<0.1 ± <0.1

buttercup, longbeak (Ranunculus longirostris)

0.1 ± 0.3

<0.1 ± <0.1

coontail (Ceratophyllum demersum)

1.1 ± 0.9

0.1 ± 0.1

27.2 ± 3.8

3.5 ± 0.6

18.0 ± 3.1

2.6 ± 0.5

pondweed, curly (Potamogeton crispus)

0.4 ± 0.5

<0.1 ± 0.1

11.3 ± 2.8

1.3 ± 0.4

6.8 ± 2.3

0.8 ± 0.3

pondweed, flatstem (P. zosteriformis)

6.2 ± 2.2

0.6 ± 0.2

3.9 ± 1.8

0.4 ± 0.2

pondweed, horned (Zannichellia palustris)

1.5 ± 1.0

0.2 ± 0.1

0.8 ± 0.8

0.1 ± 0.1

pondweed, leafy/small (Potamogeton foliosus/pusillus)

12.6 ± 3.1

1.3 ± 0.4

8.8 ± 2.6

1.0 ± 0.3

pondweed, longleaf (P. nodosus)

0.4 ± 0.5

0.1 ± 0.1

5.7 ± 2.1

0.7 ± 0.3

3.6 ± 1.7

0.4 ± 0.2

pondweed, ribbonleaf (P. epihydrus)

0.2 ± 0.3

<0.1 ± <0.1

0.1 ± 0.2

<0.1 ± <0.1

pondweed, sago (P. pectinatus)

17.8 ± 4.7

2.3 ± 0.7

9.8 ± 2.6

1.3 ± 0.4

16.0 ± 3.6

2.1 ± 0.5

stargrass, water (Heteranthera dubia)

22.8 ± 3.7

2.7 ± 0.5

12.4 ± 2.9

1.5 ± 0.4

watermilfoil, Eurasian (Myriophyllum spicatum)

17.3 ± 3.3

1.9 ± 0.4

9.3 ± 2.6

1.0 ± 0.3

waternymph, nodding (Najas flexilis)

4.2 ± 2.0

0.5 ± 0.3

2.9 ± 1.7

0.4 ± 0.2

waterweed, Canadian (Elodea canadensis)

0.4 ± 0.5

<0.1 ± <0.1

28.9 ± 4.0

3.7 ± 0.6

16.6 ± 3.2

2.1 ± 0.5

wildcelery (Vallisneria americana)

23.3 ± 3.8

3.1 ± 0.6

12.5 ± 2.9

1.7 ± 0.4

all submersed species

18.5 ± 4.8

2.2 ± 0.6

48.9 ± 4.0

7.8 ± 0.8

37.6 ± 4.3

5.8 ± 0.7

Freq

Cover

Freq

Cover

Freq

Cover

lotus, American
(Nelumbo lutea)

3.5 ± 1.7

0.6 ± 0.4

1.9 ± 1.3

0.3 ± 0.3

waterlily, white
(Nymphaea odorata)

1.4 ± 1.0

0.3 ± 0.2

11.9 ± 2.9

2.4 ± 0.9

8.5 ± 2.5

1.6 ± 0.7

all rooted floating-leaf species

1.4 ± 1.0

0.3 ± 0.2

13.8 ± 3.1

2.9 ± 0.9

9.5 ± 2.6

1.8 ± 0.8

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Table 2. Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating-leaf vegetation in Pool 4, Upper Mississippi River System, 1999.