Table 6. 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 6. Percent frequency, abundance index (AI), cover, and standard errors of submersed and rooted floating-leaf vegetation in La Grange Pool, Illinois River, 2000.

Common name (Scientific name)	Contiguous backwater n = 100		Isolated backwater n = 138		Lake n = 57
Common name (Scientific name)	Freq	AI	Freq	AI	Freq	AI
bladderwort, common (Utricularia macrorhiza)	-	-	-	-	3.5 ± 2.5	0.5 ± 0.4
chara (Chara spp.)	-	-	-	-	3.5 ± 2.5	0.4 ± 0.3
coontail (Ceratophyllum demersum)	-	-	-	-	28.1 ± 6.0	7.0 ± 2.5
pondweed, horned (Zannichellia palustris)	-	-	-	-	1.8 ± 1.8	0.2 ± 0.2
pondweed, sago (Potamogeton pectinatus)	-	-	-	-	8.8 ± 3.8	0.7 ± 0.3
watermilfoil, Eurasian, (Myriophyllum spicatum)	-	-	-	-	63.2 ± 6.4	18.6 ± 3.0
watermilfoil, northern (M. sibiricum)	-	-	-	-	45.6 ± 6.7	9.0 ± 1.6
waternymph, brittle (Najas minor)	-	-	-	-	3.5 ± 2.5	0.3 ± 0.2
waternymph, southern (N. guadalupensis)	-	-	-	-	1.8 ± 1.8	0.1 ± 0.1
all submersed species	-	-	-	-	80.7 ± 5.3	26.8 ± 3.4
	Freq	Cover	Freq	Cover	Freq	Cover
lotus, American (Nelumbo lutea)	1.0 ± 1.0	0.3 ± 0.3	9.4 ± 2.5	0.9 ± 0.2	22.8 ± 5.6	8.9 ± 2.6
primrose-willow (Ludwigia spp.)	-	-	-	-	1.8 ± 1.8	0.5 ± 0.5
waterlily, white (Nymphaea odorata)	-	-	-	-	14.0 ± 4.6	6.3 ± 2.6
all rooted floating–leaf species	1.0 ± 1.0	0.3 ± 0.3	9.4 ± 2.5	0.9 ± 0.2	33.3 ± 6.3	17.0 ± 3.7

Table 6. Continued.

Common name (Scientific name)	Main channel border n = 80		Secondary channel n = 50		La Grange Pool* n = 368
Common name (Scientific name)	Freq	AI	Freq	AI	Freq	AI
bladderwort, common (Utricularia macrorhiza)	-	-	-	-	-	-
chara (Chara spp.)	-	-	-	-	-	-
coontail (Ceratophyllum demersum)	-	-	-	-	-	-
pondweed, horned(Zannichellia palustris)	-	-	-	-	-	-
pondweed, sago (Potamogeton pectinatus)	-	-	-	-	-	-
watermilfoil, Eurasian, (Myriophyllum spicatum)	-	-	-	-	-	-
watermilfoil, northern (M. sibiricum)	-	-	-	-	-	-
waternymph, brittle (Najas minor)	-	-	-	-	-	-
waternymph, southern (N. guadalupensis)	-	-	-	-	-	-
all submersed species	-	-	-	-	-	-
	Freq	Cover	Freq	Cover	Freq	Cover
lotus, American (Nelumbo lutea)	-	-	-	-	6.0 ± 1.5	0.7 ± 0.2
primrose-willow (Ludwigia spp.)	-	-	-	-	-	-
waterlily, white (Nymphaea odorata)	-	-	-	-	-	-
all rooted floating–leaf species	-	-	-	-	6.0 ± 1.5	0.7 ± 0.2

*Lakes are not influenced by the Illinois River and, therefore, were not included in La Grange Pool percent frequency and abundance index.

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