Table 5. 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 5. Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating-leaf vegetation in Pool 26, Upper Mississippi River System, 2000.

Common name (Scientific name)	Contiguous backwater n = 80		Isolated backwater, Illinois River n = 95		Isolated backwater, Mississippi River n = 42
Common name (Scientific name)	Freq	AI	Freq	AI	Freq	AI
coontail (Ceratophyllum demersum)	-	-	5.3 ± 2.3	0.8 ± 0.4	2.4 ± 2.4	0.2 ± 0.2
pondweed, leafy (Potamogeton foliosus)	-	-	1.1 ± 1.1	0.1 ± 0.1	-	-
pondweed, longleaf (P. nodosus)	-	-	3.2 ± 1.8	0.4 ± 0.3	-	-
pondweed, sago (P. pectinatus)	-	-	11.6 ± 3.3	2.1 ± 0.8	-	-
waternymph, southern (Najas guadalupensis)	-	-	7.4 ± 2.7	1.5 ± 0.6	-	-
waterweed, Canadian (Elodea canadensis)	-	-	3.2 ± 1.8	0.2 ± 0.1	-	-
all submersed species	-	-	14.7 ± 3.7	3.4 ± 1.0	2.4 ± 2.4	0.2 ± 0.2
	Freq	Cover	Freq	Cover	Freq	Cover
lotus, American (Nelumbo lutea)	8.8 ± 3.2	0.9 ± 0.3	5.3 ± 2.3	0.7 ± 0.4	-	-
primrose-willow, floating (Ludwigia peploides)	2.5 ± 1.8	0.3 ± 0.2	3.2 ± 1.8	0.3± 0.2	4.8 ± 3.3	1.0 ± 0.7
all rooted floating–leaf species	10.0 ± 3.4	1.0 ± 0.3	6.3 ± 2.5	0.8 ± 0.4	4.8 ± 3.3	1.0 ± 0.7

Table 5. Continued.

Common name (Scientific name)	Impounded n = 40		Main channel border, Illinois River n = 40		Main channel border, Mississippi River n = 50
Common name (Scientific name)	Freq	AI	Freq	AI	Freq	AI
coontail (Ceratophyllum demersum)	-	-	-	-	-	-
pondweed, leafy (Potamogeton foliosus)	-	-	-	-	-	-
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)	2.5 ± 2.5	0.3 ± 0.3	-	-	-	-
all rooted floating–leaf species	2.5 ± 2.5	0.3 ± 0.3	-	-	-	-

Table 5. Continued.

Common name (Scientific name)	Secondary channel n = 50		Pool 26 n = 397
Common name (Scientific name)	Freq	AI	Freq	AI
coontail (Ceratophyllum demersum)	-	-	2.1 ± 0.9	0.3 ± 0.1
pondweed, leafy (Potamogeton foliosus)	-	-	0.4 ± 0.4	0.1 ± 0.1
pondweed, longleaf (P. nodosus)	-	-	1.2 ± 0.7	0.2 ± 0.1
pondweed, sago (P. pectinatus)	-	-	4.3 ± 1.2	0.8 ± 0.3
waternymph, southern (Najas guadalupensis)	-	-	2.8 ± 1.0	0.6 ± 0.2
waterweed, Canadian (Elodea canadensis)	-	-	1.2 ± 0.7	0.1 ± <0.1
all submersed species	-	-	5.7 ± 1.4	1.3 ± 0.4
	Freq	Cover	Freq	Cover
lotus, American (Nelumbo lutea)	-	-	2.5 ± 0.9	0.3 ± 0.1
primrose-willow, floating (Ludwigia peploides)	-	-	1.7 ± 0.7	0.2 ± 0.1
all rooted floating–leaf species	-	-	3.3 ± 1.0	0.4 ± 0.2

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