Upper Midwest Environmental Sciences Center

Table 4. Frequency - species1
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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 0.1 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
449 2009 42.5 2.3 8.1 0.5 18.5 1.8 2.3 0.2 15.4 1.7 2.2 0.3
448 2010 43.0 2.3 7.7 0.5 11.0 1.5 1.1 0.2 12.4 1.6 1.8 0.2
449 2011 42.8 2.3 6.7 0.4 6.4 1.2 0.7 0.1 19.9 1.9 2.9 0.3
450 2012 30.5 2.2 5.5 0.4 8.1 1.3 1.0 0.2 18.4 1.8 3.1 0.3
449 2013 29.8 2.2 4.6 0.4 8.6 1.3 1.1 0.2 19.1 1.9 3.0 0.3
447 2014 32.3 2.2 5.1 0.5 8.4 1.3 1.1 0.2 18.8 1.9 2.9 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
130
1998
 2.7 1.4 0.4 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
148
1999
 2.7 1.3 0.4 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
170
2000
 2.7 1.3 0.3 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
170
2001
 2.3 1.1 0.2 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
170
2002
 5.0 1.7 0.6 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
–
2003a
–
–
–
–
–
–
–
–
–
–
–
–
174
2004
 0.7 0.6 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
140
2005
 5.3 1.9 1.1 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
140
2006
 4.5 1.8 2.0 1.0 0.8 0.7 0.1 0.1 0.0 0.0 0.0 0.0
138
2007
 7.0 2.2 1.6 0.6 0.0 0.0 0.0 0.0 0.8 0.7 0.1 0.1
140
2008
 16.4 3.2 3.2 0.8 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
139 2009 20.2 3.4 3.2 0.6 1.5 10 0.2 0.1 0.0 0.0 0.0 0.0
140 2010 25.3 3.7 3.7 0.6 0.8 0.7 0.1 0.1 0.0 0.0 0.0 0.0
140 2011 31.3 3.9 4.6 0.8 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
140 2012 13.6 2.9 2.2 0.6 0.0 0.0 0.0 0.0 0.8 0.7 0.1 0.1
140 2013 4.1 1.7 0.5 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
139 2014 11.9 2.8 1.2 0.3 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
259
1998
 35.0 3.0 5.8 0.7 17.9 2.4 2.2 0.3 31.8 2.9 5.0 0.5
267
1999
 32.3 2.9 4.2 0.4 21.0 2.5 2.3 0.3 27.1 2.7 3.7 0.4
279
2000
 25.4 2.6 3.8 0.5 19.8 2.4 2.2 0.3 29.4 2.7 4.0 0.4
276
2001
 35.9 2.9 5.0 0.5 18.7 2.4 2.1 0.3 28.3 2.7 4.4 0.5
280
2002
 28.7 2.7 3.6 0.4 23.2 2.5 2.9 0.3 32.4 2.8 4.6 0.4
–
2003a
–
–
–
–
–
–
–
–
–
–
–
–
283
2004
 33.3 2.8 4.8 0.5 18.2 2.3 2.2 0.3 24.4 2.6 3.8 0.4
177
2005
 49.7 3.8 9.6 0.9 33.6 3.6 4.4 0.5 34.4 3.6 5.3 0.6
180
2006
 64.6 3.6 11.4 0.8 32.0 3.5 4.1 0.5 37.2 3.6 5.1 0.5
180
2007
 62.6 3.6 11.8 0.8 28.2 3.4 3.0 0.4 24.8 3.2 3.6 0.5
180
2008
 75.7 3.2 14.7 0.9 35.1 3.6 4.0 0.4 35.5 3.6 5.4 0.6
180 2009 76.8 3.2 15.2 0.9 40.6 3.7 5.1 0.5 28.6 3.4 4.3 0.5
179 2010 76.6 3.2 14.6 0.9 23.6 3.2 2.3 0.3 23.6 3.2 3.5 0.5
180 2011 66.7 3.5 10.8 0.7 13.4 2.6 1.5 0.3 36.1 3.6 5.4 0.6
180 2012 55.0 3.7 10.2 0.8 18.2 2.9 2.3 0.4 36.5 3.6 6.2 0.7
180 2013 55.0 3.7 8.7 0.7 17.9 2.9 2.3 0.4 39.2 3.7 6.2 0.6
179 2014 55.1 3.7 9.1 0.9 19.0 2.9 2.4 0.4 37.1 3.6 5.7 0.6
aAnalysis was not completed because no data were collected for the isolated backwater and Lake Pepin strata.


Lake Pepin
Year
Coontail
Eurasian watermilfoil
Wild celery
n
 
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
86
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
100
1999
 0.8 0.9 0.1 0.1 0.0 0.0 0.0 0.0 1.5 1.2 0.2 0.2
150
2000
 0.7 0.7 0.1 0.1 0.7 0.7 0.1 0.1 1.1 0.8 0.1 0.1
150
2001
 1.0 0.8 0.1 0.1 0.0 0.0 0.0 0.0 3.2 1.5 0.2 0.2
150
2002
 1.1 0.8 0.1 0.1 0.0 0.0 0.0 0.0 2.9 1.4 0.2 0.2
–
2003a
–
–
–
–
–
–
 – –
–
–
 – –
154
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
109
2005
 0.5 0.7 0.0 0.0 0.0 0.0 0.0 0.0 1.1 1.0 0.1 0.1
110
2006
 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.6 1.2 0.2 0.2
110
2007
 3.0 1.6 0.3 0.1 0.0 0.0 0.0 0.0 2.7 1.6 0.2 0.1
110
2008
 5.4 2.2 0.5 0.2 0.0 0.0 0.0 0.0 3.8 1.8 0.5 0.3
110 2009 4.2 1.9 0.3 0.1 0.0 0.0 0.0 0.0 7.2 2.5 0.7 0.3
110 2010 4.9 2.1 0.3 0.1 0.5 0.7 0.0 0.0 5.7 2.2 0.6 0.3
110 2011 11.5 3.1 1.2 0.3 1.2 1.1 0.1 0.1 11.2 3.0 1.5 0.4
110 2012 0.5 0.7 0.0 0.0 0.0 0.0 0.0 0.0 6.1 2.3 0.8 0.3
109 2013 4.9 2.1 0.3 0.1 0.0 0.0 0.0 0.0 5.0 2.1 0.7 0.3
110 2014 5.3 2.1 0.4 0.2 0.0 0.0 0.0 0.0 6.6 2.4 1.0 0.4
a Analysis 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 2.2 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
447 2009 64.6 2.3 10.1 0.5 23.1 2.0 2.4 0.2 33.7 2.2 5.8 0.4
444 2010 79.6 1.9 13.7 0.5 26.1 2.1 2.6 0.2 41.6 2.3 7.4 0.5
447 2011 50.0 2.4 7.0 0.4 7.8 1.3 0.8 0.1 35.6 2.3 5.4 0.4
450 2012 49.0 2.4 7.6 0.5 11.3 1.5 1.3 0.2 40.6 2.3 9.4 0.6
450 2013 40.1 2.3 6.7 0.5 12.8 1.6 1.5 0.2 36.3 2.3 6.6 0.4
449 2014 40.1 2.3 5.9 0.4 9.0 1.4 0.9 0.2 35.8 2.3 5.9 0.4

Pool 13
Year
Coontail
Eurasian watermilfoil
Wild celery
n
 
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
Frq
± SE
AI
± SE
529
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
549
1999
 19.2 1.7 3.4 0.4 6.8 1.1 0.7 0.1 13.4 1.5 2.5 0.3
575
2000
 25.3 1.8 4.3 0.4 15.1 1.5 1.8 0.2 16.0 1.5 2.9 0.3
599
2001
 27.8 1.8 5.4 0.5 9.0 1.2 1.0 0.1 14.6 1.4 2.9 0.3
578
2002
 24.6 1.8 4.5 0.4 14.1 1.5 1.8 0.2 16.2 1.5 4.4 0.5
579
2003
 26.6 1.8 5.3 0.5 17.0 1.6 2.1 0.2 15.1 1.5 3.3 0.4
644
2004
 27.3 1.8 4.9 0.4 14.9 1.4 1.9 0.2 19.3 1.6 3.6 0.3
447
2005
 29.1 2.2 4.6 0.4 18.5 1.8 2.3 0.3 22.3 2.0 5.3 0.5
447
2006
 40.6 2.3 6.8 0.5 19.5 1.9 2.2 0.2 24.1 2.0 4.8 0.5
442
2007
 40.3 2.3 7.1 0.5 21.1 2.0 2.5 0.3 26.7 2.1 6.5 0.6
443
2008
 40.9 2.3 6.0 0.4 5.4 1.1 0.5 0.1 25.2 2.1 4.5 0.4
443 2009 37.7 2.3 6.3 0.5 10.4 1.5 1.6 0.3 28.5 2.1 7.3 0.6
448 2010 48.2 2.4 7.7 0.4 17.8 1.8 2.2 0.2 26.2 2.1 6.6 0.6
450 2011 37.5 2.3 6.2 0.5 4.8 1.0 0.5 0.1 25.7 2.1 5.0 0.4
448 2012 25.6 2.1 4.7 0.5 11.3 1.5 1.7 0.2 26.0 2.1 6.9 0.7
447 2013 22.6 2.0 3.1 0.4 7.3 1.2 1.2 0.2 29.0 2.2 6.2 0.5
449 2014 25.0 2.1 3.3 0.4 2.0 0.7 0.2 0.1 27.0 2.1 5.6 0.5

 

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 0.0
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.

Content manager: Danelle Larson


Page Last Modified: April 17, 2018