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Table 4.   Percent frequency of occurrence and abundance index of coontail (Ceratophyllum demersum L.; submersed), Eurasian watermilfoil (Myriophyllum spicatum L.; submersed), and wild celery (Vallisneria americana Michx.; submersed) by year and study reach, weighted by the areas of the aquatic strata (n = number of sites, Frq = percent frequency of occurrence, SE = standard error, AI = abundance index). In 1998, sites were selected from depths less than or equal to 3 m.  After 1998, the criteria was changed to less than or equal to 2.5 m; therefore, any sites between 2.5 and 3 m were dropped from the 1998 analysis for comparison purposes.

Pool 4
Year
Coontail
Eurasian watermilfoil
Wild celery
n
 
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
506
1998
19.6
1.8
3.5
0.4
8.2
1.2
1.0
0.2
14.1
1.6
2.2
0.3
549
1999
17.9
1.6
2.5
0.3
9.3
1.2
1.0
0.2
12.5
1.4
1.7
0.2
631
2000
14.8
1.4
2.6
0.3
9.7
1.2
1.2
0.2
13.5
1.4
1.9
0.2
646
2001
19.4
1.6
2.8
0.3
8.4
1.1
1.0
0.1
13.9
1.4
2.1
0.2
630
2002
17.1
1.5
2.3
0.2
10.3
1.2
1.3
0.2
15.4
1.4
2.2
0.2
–
2003a
–
–
–
–
–
–
–
–
–
–
–
–
643
2004
17.3
1.5
2.7
0.3
8.2
1.1
1.0
0.1
10.8
1.2
1.7
0.2
446
2005
24.8
2.1
4.8
0.5
14.9
1.7
2.0
0.2
15.6
1.7
2.4
0.3
441
2006
32.5
2.2
6.3
0.5
15.1
1.7
1.9
0.2
17.0
1.8
2.4
0.3
438
2007
32.5
2.3
6.0
0.5
12.9
1.6
1.4
0.2
12.1
1.6
1.7
0.2
450
2008
41.2
2.3
7.8
0.5
16.0
1.7
1.8
0.2
17.1
1.8
2.6
0.3
aPoolwide analysis was not calculated because no data were collected for the isolated backwater and Lake Pepin strata.

 

Upper Pool 4
Year
Coontail
Eurasian watermilfoil
Wild celery
n
 
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
187
1998
1.1
0.8
0.2
0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
213
1999
1.1
0.7
0.2
0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
245
2000
1.1
0.7
0.1
0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
245
2001
1.7
0.8
0.1
0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
245
2002
2.0
0.9
0.2
0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
–
2003a
–
–
–
–
–
–
–
–
–
–
–
–
251
2004
0.3
0.3
0.1
0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
199
2005
2.1
1.0
0.4
0.2
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
200
2006
1.8
0.9
0.8
0.5
0.3
0.4
0.0
0.0
0.0
0.0
0.0
0.0
198
2007
4.8
1.5
0.8
0.3
0.0
0.0
0.0
0.0
0.3
0.4
0.0
0.0
200
2008
10.5
2.2
1.6
0.5
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
aAnalysis was not completed because no data were collected for the isolated backwater and Lake Pepin strata.

 

Lower Pool 4
Year
Coontail
Eurasian watermilfoil
Wild celery
n
 
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
288
1998
28.9
2.7
4.7
0.6
14.8
2.1
1.8
0.3
26.2
2.6
4.1
0.5
302
1999
27.2
2.6
3.5
0.4
17.3
2.2
1.9
0.3
23.3
2.4
3.1
0.4
354
2000
21.4
2.2
3.2
0.4
16.8
2.0
1.8
0.2
24.9
2.3
3.4
0.3
351
2001
29.6
2.4
4.1
0.4
15.4
1.9
1.8
0.2
25.5
2.3
3.9
0.4
355
2002
24.4
2.3
3.0
0.3
19.2
2.1
2.4
0.3
28.6
2.4
4.1
0.4
–
2003a
–
–
–
–
–
–
–
–
–
–
–
–
360
2004
27.4
2.4
4.0
0.4
15.0
1.9
1.8
0.2
20.1
2.1
3.2
0.3
227
2005
41.3
3.3
8.0
0.8
27.7
3.0
3.7
0.4
29.0
3.0
4.5
0.5
230
2006
53.3
3.3
9.4
0.7
26.4
2.9
3.4
0.4
31.7
3.1
4.4
0.5

230
2007
52.0
3.3
9.8
0.7
23.2
2.8
2.5
0.3
22.2
2.8
3.1
0.4
230
2008
62.8
3.2
12.1
0.8
28.9
3.0
3.3
0.4
31.8
3.1
4.8
0.5
aAnalysis was not completed because no data were collected for the isolated backwater and Lake Pepin strata.

 

Pool 8
Year
Coontail
Eurasian watermilfoil
Wild celery
n
 
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
516
1998
25.6
1.9
4.7
0.5
8.1
1.2
1.0
0.2
10.2
1.3
1.3
0.2
595
1999
28.8
1.9
4.7
0.4
12.6
1.4
1.4
0.2
9.5
1.2
1.3
0.2
649
2000
24.2
1.7
4.0
0.3
13.4
1.3
1.6
0.2
14.3
1.4
1.8
0.2
670
2001
29.2
1.8
4.3
0.3
5.6
0.9
0.6
0.1
13.7
1.3
1.9
0.2
644
2002
28.0
1.8
4.6
0.3
16.9
1.5
2.0
0.2
19.3
1.6
2.9
0.3
649
2003
31.4
1.8
4.5
0.3
12.8
1.3
1.6
0.2
21.1
1.6
3.3
0.3
649
2004
31.5
1.8
5.2
0.4
15.6
1.4
2.0
0.2
24.9
1.7
4.1
0.3
450
2005
38.3
2.3
5.7
0.4
17.7
1.8
2.0
0.2
28.5
2.1
5.9
0.5
444
2006
51.9
2.4
8.2
0.5
21.4
2.0
2.6
0.3
33.7
2.3
7.1
0.5
448
2007
55.3
2.4
9.5
0.5
20.6
1.9
2.1
0.2
33.1
2.2
7.4
0.6
447
2008
61.5
2.3
9.4
0.4
20.8
1.9
2.1
0.2
32.7
2.2
5.5
0.4

Pool 13
Year
Coontail
Eurasian watermilfoil
Wild celery
n
 
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
531
1998
26.1
1.9
4.1
0.4
10.0
1.3
1.2
0.2
14.5
1.5
2.6
0.3
550
1999
19.0
1.7
3.4
0.4
6.8
1.1
0.7
0.1
13.4
1.5
2.4
0.3
578
2000
25.0
1.8
4.3
0.4
15.1
1.5
1.8
0.2
16.0
1.5
2.9
0.3
606
2001
27.5
1.8
5.3
0.5
9.0
1.2
1.0
0.1
14.6
1.4
2.9
0.3
579
2002
24.5
1.8
4.5
0.4
14.1
1.5
1.8
0.2
16.2
1.5
4.4
0.5
580
2003
26.5
1.8
5.3
0.5
17.0
1.6
2.1
0.2
15.1
1.5
3.3
0.4
648
2004
27.1
1.8
4.9
0.4
14.9
1.4
1.9
0.2
19.3
1.6
3.6
0.3
450
2005
28.7
2.1
4.6
0.4
18.4
1.8
2.3
0.3
22.2
2.0
5.3
0.5
450
2006
40.2
2.3
6.8
0.5
19.4
1.9
2.1
0.2
24.1
2.0
4.8
0.1
444
2007
40.2
2.3
7.1
0.5
21.1
1.9
2.5
0.3
26.7
2.1
6.4
0.6
448
2008
40.4
2.3
5.9
0.4
5.3
1.1
0.4
0.1
25.2
2.1
4.5
0.4

 

Pool 26 - alla
Year
Coontail
Eurasian watermilfoil
Wild celery
n
 
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
519
1998
4.8
0.9
0.7
0.2
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
647
1999
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
392
2000
2.1
0.7
0.3
0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
413
2001
1.2
0.5
0.1
<0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
417
2002
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
420
2003b
1.1
0.5
0.1
0.1
0.0
0.0
0.0
0.0
0.7
0.4
0.1
<0.1
550
2004
0.6
0.3
0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
aAnalysis includes Pool 26 of the Mississippi River and lower Alton Pool of the Illinois River.
bData were provided by the Illinois Natural History Survey based on a grant from the National Great Rivers Research and Education Center.

 

Pool 26, MRa
Year
Coontail
Eurasian watermilfoil
Wild celery
n
 
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
312
1998
0.5
0.4
0.1
0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
437
1999
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
257
2000
0.2
0.3
<0.1
<0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
279
2001
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
277
2002
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
280
2003b
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
362
2004
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
aPool 26, Mississippi River
bData were provided by the Illinois Natural History Survey based on a grant from the National Great Rivers Research and Education Center.

 

Pool 26 - ILa
Year
Coontail
Eurasian watermilfoil
Wild celery
n
 
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
207
1998
10.9
2.2
1.7
0.4
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
210
1999
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
135
2000
4.4
1.8
0.7
0.3
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
134
2001
2.7
1.4
0.2
0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
140
2002
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
140
2003b
2.5
1.3
0.3
0.2
0.0
0.0
0.0
0.0
1.7
1.1
0.1
0.1
188
2004
1.3
0.8
0.2
0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
aLower Alton Pool, Illinois River
bData were provided by the Illinois Natural History Survey based on a grant from the National Great Rivers Research and Education Center.

 

La Grange Poola
Year
Coontail
Eurasian watermilfoil
Wild celery
n
 
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
464
1998
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
538
1999
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
368
2000
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
357
2001
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
369
2002
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
347
2003b
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
471
2004
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
aLakes are not influenced by the Illinois River; therefore, the lakes stratum was not included in the poolwide analysis.
bData were provided by the Illinois Natural History Survey based on a grant from the Illinois Department of Natural Resources.

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