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.

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Vegetation - Stratified Random Sampling 2000

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, 2000.

Common name (Scientific name)	Contiguous backwater, upper n = 100		Contiguous backwater, lower n = 179		Isolated backwater n = 32
Common name (Scientific name)	Freq	AI	Freq	AI	Freq	AI
bladderwort, common (Utricularia macrorhiza)	-	-	0.6 ± 0.6	<0.1 ± <0.1	-	-
chara (Chara spp.)	-	-	1.7 ± 1.0	0.2 ± 0.1	6.3 ± 4.3	0.9 ± 0.6
coontail (Ceratophyllum demersum)	4.0 ± 2.0	0.5 ± 0.3	30.2 ± 3.4	4.5 ± 0.7	65.6 ± 8.5	18.2 ± 4.6
pondweed, alpine (Potamogeton alpinus)	-	-	0.6 ± 0.6	0.1 ± 0.1	-	-
pondweed, curly (Potamogeton crispus)	1.0 ± 1.0	0.1 ± 0.1	7.8 ± 2.0	1.0 ± 0.3	28.1 ± 8.1	3.2 ± 1.0
pondweed, flatstem (P. zosteriformis)	-	-	7.3 ± 1.9	0.7 ± 0.2	3.1 ± 3.1	0.2 ± 0.2
pondweed, horned (Zannichellia palustris)	-	-	1.7 ± 1.0	0.2 ± 0.1	6.3 ± 4.3	0.7 ± 0.5
pondweed, leafy/small (Potamogeton foliosus/pusillus)	-	-	7.3 ± 1.9	0.7 ± 0.2	28.1 ± 8.1	3.2 ± 1.1
pondweed, longleaf (P. nodosus)	2.0 ± 1.4	0.2 ± 0.2	1.7 ± 1.0	0.2 ± 0.1	9.4 ± 5.2	1.2 ± 0.7
pondweed, sago (P. pectinatus)	15.0 ± 3.6	1.5 ± 0.4	8.9 ± 2.1	0.9 ± 0.2	43.8 ± 8.9	5.0 ± 1.1
stargrass, water (Heteranthera dubia)	-	-	32.4 ± 3.5	4.0 ± 0.5	6.3 ± 4.3	0.6 ± 0.5
watermilfoil, Eurasian (Myriophyllum spicatum)	-	-	23.5 ± 3.2	2.6 ± 0.4	15.6 ± 6.5	4.9 ± 2.4
waternymph, nodding (Najas flexilis)	-	-	4.5 ± 1.5	0.7 ± 0.2	-	-
waterweed, Canadian (Elodea canadensis)	-	-	23.5 ± 3.2	3.1 ± 0.5	31.3 ± 8.3	6.7 ± 2.5
wildcelery (Vallisneria americana)	-	-	31.3 ± 3.5	4.4 ± 0.5	3.1 ± 3.1	0.2 ± 0.2
all submersed species	18.0 ± 3.9	2.0 ± 0.5	64.2 ± 3.6	10.7 ± 0.8	81.3 ± 7.0	26.7 ± 4.9
	Freq	Cover	Freq	Cover	Freq	Cover
lotus, American (Nelumbo lutea)	-	-	3.4 ± 1.3	0.6 ± 0.3	-	-
pond-lily, yellow (Nuphar variegata)	-	-	1.1 ± 0.8	0.1 ± 0.1	-	-
waterlily, white (Nymphaea odorata)	5.0 ± 2.2	3.7 ± 1.8	16.2 ± 2.8	1.8 ± 0.3	46.9 ± 9.0	14.1 ± 4.1
all rooted floating-leaf species	5.0 ± 2.2	3.7 ± 1.8	19.6 ± 3.0	2.4 ± 0.4	46.9 ± 9.0	14.1 ± 4.1

Table 2. Continued.

Common name (Scientific name)	Lake Pepin, upper n = 75		Lake Pepin, lower n = 75		Main channel border, upper n = 30
Common name (Scientific name)	Freq	AI	Freq	AI	Freq	AI
bladderwort, common (Utricularia macrorhiza)	-	-	-	-	-	-
chara (Chara spp.)	-	-	-	-	-	-
coontail (Ceratophyllum demersum)	-	-	2.7 ± 1.9	0.3 ± 0.2	-	-
pondweed, alpine (Potamogeton alpinus)	-	-	-	-	-	-
pondweed, curly (Potamogeton crispus)	-	-	-	-	-	-
pondweed, flatstem (P. zosteriformis)	-	-	-	-	-	-
pondweed, horned (Zannichellia palustris)	-	-	-	-	-	-
pondweed, leafy/small (Potamogeton foliosus/pusillus)	-	-	10.7 ± 3.6	0.9 ± 0.3	-	-
pondweed, longleaf (P. nodosus)	-	-	1.3 ± 1.3	0.2 ± 0.2	-	-
pondweed, sago (P. pectinatus)	14.7 ± 4.1	1.3 ± 0.4	20.0 ± 4.6	2.6 ± 0.6	3.3 ± 3.3	0.2 ± 0.2
stargrass, water (Heteranthera dubia)	-	-	5.3 ± 2.6	0.5 ± 0.3	-	-
watermilfoil, Eurasian (Myriophyllum spicatum)	-	-	2.7 ± 1.9	0.2 ± 0.2	-	-
waternymph, nodding (Najas flexilis)	-	-	24.0 ± 5.0	3.5 ± 0.8	-	-
waterweed, Canadian (Elodea canadensis)	-	-	24.0 ± 5.0	3.1 ± 0.7	-	-
wildcelery (Vallisneria americana)	-	-	4.0 ± 2.3	0.5 ± 0.3	-	-
all submersed species	14.7 ± 4.1	1.3 ± 0.4	46.7 ± 5.8	6.4 ± 0.9	3.3 ± 3.3	0.2 ± 0.2
	Freq	Cover	Freq	Cover	Freq	Cover
lotus, American (Nelumbo lutea)	-	-	-	-	-	-
pond-lily, yellow (Nuphar variegata)	-	-	-	-	-	-
waterlily, white (Nymphaea odorata)	-	-	-	-	-	-
all rooted floating-leaf species	-	-	-	-	-	-

Table 2. Continued.

Common name (Scientific name)	Main channel border, lower n = 40		Secondary channel, upper n = 40		Secondary channel, lower n = 60
Common name (Scientific name)	Freq	AI	Freq	AI	Freq	AI
bladderwort, common (Utricularia macrorhiza)	-	-	-	-	-	-
chara (Chara spp.)	-	-	-	-	-	-
coontail (Ceratophyllum demersum)	2.5 ± 2.5	0.3 ± 0.3	-	-	16.7 ± 4.9	2.5 ± 0.8
pondweed, alpine (Potamogeton alpinus)	-	-	-	-	1.7 ± 1.7	0.1 ± 0.1
pondweed, curly (Potamogeton crispus)	7.5 ± 4.2	0.8 ± 0.5	-	-	18.3 ± 5.0	2.7 ± 0.8
pondweed, flatstem (P. zosteriformis)	-	-	-	-	6.7 ± 3.2	0.5 ± 0.3
pondweed, horned (Zannichellia palustris)	-	-	-	-	-	-
pondweed, leafy/small (Potamogeton foliosus/pusillus)	-	-	-	-	5.0 ± 2.8	0.6 ± 0.3
pondweed, longleaf (P. nodosus)	2.5 ± 2.5	0.3 ± 0.3	-	-	11.7 ± 4.2	1.5 ± 0.6
pondweed, sago (P. pectinatus)	5.0 ± 3.5	0.3 ± 0.2	-	-	15.0 ± 4.6	1.2 ± 0.4
stargrass, water (Heteranthera dubia)	15.0 ± 5.7	1.1 ± 0.4	-	-	30.0 ± 6.0	3.8 ± 0.8
watermilfoil, Eurasian (Myriophyllum spicatum)	-	-	-	-	15.0 ± 4.6	1.6 ± 0.5
waternymph, nodding (Najas flexilis)	-	-	-	-	-	-
waterweed, Canadian (Elodea canadensis)	5.0 ± 3.5	0.7 ± 0.5	-	-	21.7 ± 5.4	3.1 ± 0.9
wildcelery (Vallisneria americana)	12.5 ± 5.3	1.5 ± 0.7	-	-	31.7 ± 6.1	4.0 ± 0.8
all submersed species	22.5 ± 6.7	2.4 ± 0.8	-	-	45.0 ± 6.5	7.2 ± 1.2
	Freq	Cover	Freq	Cover	Freq	Cover
lotus, American (Nelumbo lutea)	-	-	-	-	-	-
pond-lily, yellow (Nuphar variegata)	-	-	-	-	-	-
waterlily, white (Nymphaea odorata)	-	-	-	-	5.0 ± 2.8	0.5 ± 0.3
all rooted floating-leaf species	-	-	-	-	5.0 ± 2.8	0.5 ± 0.3

Table 2. Continued.

Common name (Scientific name)	Pool 4, upper n = 245		Pool 4, lower n = 354		Pool 4 n = 631
Common name (Scientific name)	Freq	AI	Freq	AI	Freq	AI
bladderwort, common (Utricularia macrorhiza)	-	-	0.3 ± 0.3	<0.1 ± <0.1	0.2 ± 0.2	<0.1 ± <0.1
chara (Chara spp.)	-	-	1.0 ± 0.6	0.1 ± 0.1	0.8 ± 0.4	0.1 ± <0.1
coontail (Ceratophyllum demersum)	1.1 ± 0.5	0.1 ± 0.1	21.4 ± 2.2	3.2 ± 0.4	14.8 ± 1.3	2.6 ± 0.3
pondweed, alpine (Potamogeton alpinus)	-	-	0.5 ± 0.4	0.1 ± 0.1	0.3 ± 0.2	<0.1 ± <0.1
pondweed, curly (P. crispus)	0.3 ± 0.3	<0.1 ± <0.1	7.7 ± 1.4	1.0 ± 0.2	5.4 ± 0.9	0.7 ± 0.1
pondweed, flatstem (P. zosteriformis)	-	-	5.3 ± 1.3	0.5 ± 0.1	3.0 ± 0.7	0.3 ± 0.1
pondweed, horned (Zannichellia palustris)	-	-	1.0 ± 0.6	0.1 ± 0.1	0.8 ± 0.4	0.1 ± <0.1
pondweed, leafy/small (Potamogeton foliosus/pusillus)	-	-	7.0 ± 1.4	0.7 ± 0.2	5.0 ± 0.8	0.5 ± 0.1
pondweed, longleaf (P. nodosus)	0.5 ± 0.4	0.1 ± <0.1	2.9 ± 0.8	0.3 ± 0.1	2.2 ± 0.5	0.3 ± 0.1
pondweed, sago (P. pectinatus)	13.0. ± 2.7	1.2 ± 0.3	11.3 ± 1.7	1.2 ± 0.2	13.4 ± 1.5	1.4 ± 0.2
stargrass, water (Heteranthera dubia)	-	-	25.9 ± 2.4	3.1 ± 0.3	14.2 ± 1.3	1.7 ± 0.2
watermilfoil, Eurasian (Myriophyllum spicatum)	-	-	16.8 ± 2.1	1.8 ± 0.2	9.7 ± 1.2	1.2 ± 0.2
waternymph, nodding (Najas flexilis)	-	-	7.0 ± 1.0	1.0 ± 0.2	3.8 ± 0.7	0.5 ± 0.1
waterweed, Canadian (Elodea canadensis)	-	-	21.8 ± 2.3	2.9 ± 0.3	13.1 ± 1.3	1.8 ± 0.2
wildcelery (Vallisneria americana)	-	-	24.9 ± 2.4	3.4 ± 0.4	13.5 ± 1.3	1.9 ± 0.2
all submersed species	13.8 ± 2.7	1.3 ± 0.3	55.3 ± 2.6	8.8 ± 0.5	39.1 ± 1.8	6.5 ± 0.4
	Freq	Cover	Freq	Cover	Freq	Cover
lotus, American (Nelumbo lutea)	-	-	2.1 ± 0.8	0.3 ± 0.2	1.1 ± 0.5	0.2 ± 0.1
pond-lily, yellow (Nuphar variegata)	-	-	0.7 ± 0.5	0.1 ± <0.1	0.4 ± 0.3	<0.1 ± <0.1
waterlily, white (Nymphaea odorata)	1.3 ± 0.6	1.0 ± 0.5	10.7 ± 1.8	1.2 ± 0.2	8.3 ± 1.0	1.7 ± 0.3
all rooted floating-leaf species	1.3 ± 0.6	1.0 ± 0.5	12.8 ± 1.9	1.6± 0.3	9.4 ± 1.1	1.9± 0.3

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