Upper Midwest Environmental Sciences Center

Table 5. Frequency - species2
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Table 5. Percent frequency of occurrence and abundance index or percent cover of sago pondweed (Stuckenia pectinatus [L.] Boerner; submersed), American lotus (Nelumbo lutea Willd.; rooted, floating–leaf), and broadleaf arrowhead (Sagittaria latifolia Willd.; emergent) 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, Cov = percent cover). 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
Sago pondweed
American lotus
Broad-leaf arrowhead
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
506
1998
20.6 1.8 2.4 0.2 5.0 1.0 2.4 0.6 2.8 0.7 0.8 0.3
549
1999
15.8 1.6 2.1 0.2 1.9 0.6 0.3 0.1 3.4 0.8 0.6 0.2
631
2000
13.4 1.4 1.4 0.2 1.1 0.4 0.2 0.1 3.5 0.7 0.8 0.2
646
2001
11.5 1.3 1.4 0.2 1.1 0.4 0.3 0.1 5.2 0.9 1.2 0.3
630
2002
11.2 1.3 1.3 0.2 1.7 0.5 0.2 0.1 3.9 0.8 1.1 0.3
2003a
643
2004
8.3 1.1 1.0 0.1 2.6 0.6 0.6 0.2 5.7 0.9 2.1 0.5
446
2005
7.5 1.3 1.0 0.2 4.2 1.0 1.3 0.4 3.1 0.8 0.7 0.3
441
2006
13.4 1.6 1.9 0.3 6.2 1.2 2.1 0.5 6.6 1.2 2.5 0.6
438
2007
11.6 1.5 1.3 0.2 4.6 1.0 1.3 0.4 4.9 1.0 1.5 0.4
450
2008
17.3 1.8 2.2 0.3 3.6 0.9 1.2 0.4 6.7 1.2 2.0 0.5
449 2009 19.9 1.9 2.3 0.2 4.4 1.0 0.7 0.2 6.9 1.2 1.9 0.5
448 2010 18.0 1.8 2.2 0.2 1.8 0.6 0.2 0.1 8.5 1.3 2.3 0.5
449 2011 16.1 1.7 2.0 0.2 2.1 0.7 0.3 0.1 8.1 1.3 1.0 0.2
450 2012 9.8 1.4 1.2 0.2 2.4 0.7 0.2 0.1 3.6 0.9 0.5 0.2
449 2013 15.4 1.7 1.8 0.2 1.5 0.6 0.2 0.1 3.7 0.9 0.4 0.1
447 2014 13.1 1.6 1.5 0.2 1.5 0.6 0.2 0.1 3.4 0.9 0.4 0.2
aPoolwide estimates were not calculated because no data were collected for the isolated backwater and Lake Pepin strata.

 

Upper Pool 4a
Year
Sago pondweed
American lotus
Broad-leaf arrowhead
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
130
1998
22.1 3.7 2.8 0.5 0.0 0.0 0.0 0.0 1.5 1.1 0.3 0.2
148
1999
19.2 3.3 2.2 0.4 0.0 0.0 0.0 0.0 7.3 2.2 1.7 0.8
170
2000
10.4 2.4 1.0 0.3 0.0 0.0 0.0 0.0 2.6 1.2 0.5 0.3
170
2001
7.4 2.0 0.8 0.2 0.0 0.0 0.0 0.0 5.4 1.7 1.0 0.6
170
2002
10.7 2.4 1.2 0.3 0.0 0.0 0.0 0.0 2.7 1.3 1.1 0.7
 
2003a
174
2004
5.3 1.7 0.4 0.1 0.0 0.0 0.0 0.0 2.6 1.2 0.3 0.1
140
2005
6.8 2.1 0.8 0.3 0.0 0.0 0.0 0.0 2.3 1.3 0.4 0.2
140
2006
5.4 1.9 0.7 0.3 0.0 0.0 0.0 0.0 5.3 1.9 1.7 0.9
138
2007
16.6 3.2 1.8 0.4 0.0 0.0 0.0 0.0 8.0 2.3 2.3 0.8
140
2008
17.0 3.2 2.1 0.4 0.0 0.0 0.0 0.0 15.3 3.1 3.1 0.9
139 2009 25.5 3.7 3.3 0.5 0.0 0.0 0.0 0.0 12.6 2.8 5.0 1.4
140 2010 25.9 3.7 3.3 0.5 0.0 0.0 0.0 0.0 14.1 3.0 6.1 1.7
140 2011 26.3 3.7 3.2 0.5 0.0 0.0 0.0 0.0 6.5 2.1 0.6 0.2
140 2012 13.1 2.9 1.4 0.3 0.0 0.0 0.0 0.0 3.8 1.6 0.4 0.2
140 2013 20.3 3.4 2.6 0.5 0.0 0.0 0.0 0.0 2.3 1.3 0.2 0.1
139 2014 22.1 3.5 2.7 0.5 0.0 0.0 0.0 0.0 8.9 2.4 1.6 0.7
aAnalysis was not completed because no data were collected for the isolated backwater and Lake Pepin strata.

 

Lower Pool 4a
Year
Sago pondweed
American lotus
Broad-leaf arrowhead
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
259
1998
18.1 2.4 1.9 0.3 11.3 2.0 5.4 1.1 5.5 1.4 1.7 0.6
267
1999
11.3 1.9 1.5 0.3 4.2 1.2 0.7 0.3 4.7 1.3 0.8 0.3
279
2000
9.4 1.8 0.9 0.2 2.5 0.9 0.4 0.2 5.9 1.4 1.4 0.4
276
2001
14.3 2.1 1.7 0.3 2.6 1.0 0.6 0.3 8.6 1.7 2.2 0.6
280
2002
9.0 1.7 1.0 0.2 3.8 1.1 0.4 0.1 6.8 1.5 1.9 0.6
 
2003a
283
2004
7.3 1.6 0.8 0.2 5.8 1.4 1.3 0.4 10.4 1.8 4.4 1.0
177
2005
5.3 1.7 0.9 0.3 9.4 2.2 2.9 1.0 4.2 1.5 1.3 0.6
180
2006
9.7 2.2 1.4 0.4 14.1 2.6 4.7 1.1 11.0 2.3 5.0 1.4
180
2007
6.9 1.9 0.8 0.2 10.3 2.3 3.0 1.0 4.1 1.5 0.4 0.1
180
2008
14.5 2.6 1.8 0.4 8.2 2.1 2.6 0.8 7.9 2.0 3.0 1.0
180 2009 10.4 2.3 1.1 0.3 10.0 2.2 1.7 0.5 8.6 2.1 1.4 0.4
179 2010 12.5 2.5 1.3 0.3 4.2 1.5 0.6 0.2 11.4 2.4 2.5 0.8
180 2011 8.3 2.1 0.8 0.2 4.8 1.6 0.6 0.2 13.4 2.6 1.8 0.4
180 2012 9.3 2.1 1.1 0.3 5.5 1.7 0.5 0.2 5.1 1.7 0.7 0.2
180 2013 12.8 2.5 1.5 0.3 3.4 1.4 0.5 0.2 5.2 1.7 0.5 0.2
179 2014 9.0 2.2 0.8 0.2 3.5 1.4 0.3 0.1 2.8 1.2 0.3 0.1
aAnalysis was not completed because no data were collected for the isolated backwater and Lake Pepin strata.


Lake Pepin
Year
Sago pondweed
American lotus
Broad-leaf arrowhead
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
86
1998
17.2 4.1 2.0 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
100
1999
13.1 3.4 1.8 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
150
2000
16.1 3.0 1.7 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
150
2001
4.8 1.8 0.5 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
150
2002
7.6 2.2 0.7 0.2 0.0 0.0 0.0 0.0 0.4 0.5 0.0 0.0
2003a
154
2004
7.8 2.2 1.0 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
109
2005
7.8 2.6 0.8 0.3 0.0 0.0 0.0 0.0 1.2 1.1 0.1 0.1
110
2006
15.5 3.5 2.0 0.5 0.0 0.0 0.0 0.0 1.2 1.1 0.1 0.1
110
2007
14.1 3.3 1.5 0.4 0.0 0.0 0.0 0.0 1.2 1.1 1.1 0.9
110
2008
16.2 3.5 2.1 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
110 2009 25.0 4.2 2.7 0.5 0.0 0.0 0.0 0.0 0.5 0.7 0.1 0.1
110 2010 18.4 3.7 2.2 0.5 0.0 0.0 0.0 0.0 1.2 1.1 0.1 0.1
110 2011 15.9 3.5 2.2 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
110 2012 5.8 2.3 0.7 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
109 2013 12.8 3.2 1.3 0.3 0.0 0.0 0.0 0.0 1.2 1.1 0.1 0.1
110 2014 11.1 3.0 1.1 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
a Analysis was not completed because no data were collected for the isolated backwater and Lake Pepin strata.

 

Pool 8
Year
Sago pondweed
American lotus
Broad-leaf arrowhead
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
516
1998
18.8 1.7 2.5 0.3 7.5 1.2 3.7 0.7 5.3 1.0 2.5 0.6
595
1999
20.4 1.7 2.6 0.2 6.6 1.0 2.8 0.5 9.0 1.2 4.3 0.7
649
2000
13.9 1.4 1.5 0.2 5.4 0.9 1.4 0.3 4.8 0.8 2.0 0.4
670
2001
17.3 1.5 2.2 0.2 5.4 0.9 0.8 0.2 6.0 0.9 1.4 0.3
644
2002
14.5 1.4 1.6 0.2 6.9 1.0 1.4 0.3 8.2 1.1 3.3 0.6
649
2003
13.5 1.3 1.5 0.2 7.4 1.0 2.6 0.5 10.0 1.2 4.6 0.7
649
2004
16.7 1.5 2.0 0.2 8.2 1.1 3.0 0.5 9.3 1.1 3.3 0.6
450
2005
9.1 1.4 1.0 0.2 10.0 1.4 3.5 0.7 12.4 1.6 4.3 0.7
444
2006
17.1 1.8 1.8 0.2 12.2 1.6 5.3 0.9 9.4 1.4 5.7 1.0
448
2007
18.2 1.8 2.1 0.2 13.3 1.6 5.4 0.8 14.1 1.7 7.2 1.0
447
2008
15.2 1.7 1.7 0.2 7.5 1.2 2.3 0.5 12.8 1.6 3.4 0.5
447 2009 12.7 1.6 1.5 0.2 8.2 1.3 2.7 0.6 11.5 1.5 5.0 0.8
444 2010 6.9 1.2 0.7 0.1 4.0 0.9 0.8 0.3 14.8 1.7 4.3 0.6
447 2011 22.0 2.0 2.7 0.3 2.8 0.8 0.7 0.2 6.3 1.2 0.8 0.2
450 2012 6.7 1.2 0.7 0.1 2.5 0.7 0.7 0.2 4.6 1.0 1.5 0.5
450 2013 11.1 1.5 1.2 0.2 5.1 1.0 0.9 0.2 6.6 1.2 1.1 0.2
449 2014 11.3 1.5 1.3 0.2 1.0 0.5 0.2 0.2 5.8 1.1 1.3 0.4

 

Pool 13
Year
Sago pondweed
American lotus
Broad-leaf arrowhead
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
529
1998
22.0 1.8 2.5 0.2 16.1 1.6 7.5 1.0 2.8 0.7 1.4 0.4
549
1999
25.0 1.9 3.6 0.3 18.3 1.7 8.4 1.0 3.9 0.8 1.1 0.3
575
2000
21.8 1.7 2.9 0.3 18.3 1.6 7.3 0.9 3.7 0.8 1.8 0.5
599
2001
21.9 1.7 3.4 0.3 21.3 1.7 9.1 1.0 5.1 0.9 2.6 0.6
578
2002
22.9 1.8 3.2 0.3 21.4 1.7 6.5 0.8 4.5 0.9 2.5 0.6
579
2003
18.7 1.6 2.7 0.3 22.9 1.7 7.7 0.9 6.1 1.0 3.1 0.6
644
2004
21.1 1.6 2.8 0.2 22.6 1.7 6.2 0.7 6.1 0.9 2.3 0.5
447
2005
22.4 2.0 3.3 0.3 21.9 2.0 6.9 0.9 4.1 0.9 2.1 0.6
447
2006
22.9 2.0 2.9 0.3 25.5 2.1 10.6 1.1 7.1 1.2 4.1 0.9
442
2007
22.4 2.0 2.7 0.3 22.5 2.0 9.9 1.2 7.7 1.3 3.9 0.8
443
2008
20.5 1.9 2.6 0.3 15.3 1.7 2.2 0.4 8.9 1.4 1.6 0.4
443 2009 25.3 2.1 3.3 0.3 19.7 1.9 5.5 0.8 6.7 1.2 4.0 0.8
448 2010 13.2 1.6 1.6 0.2 16.9 1.8 5.2 0.8 7.9 1.3 3.7 0.8
450 2011 23.6 2.0 3.0 0.3 10.3 1.4 1.4 0.3 6.1 1.1 1.7 0.4
448 2012 18.2 1.8 2.5 0.3 10.7 1.5 2.3 0.5 4.4 1.0 2.1 0.5
447 2013 21.5 2.0 2.7 0.3 14.9 1.7 3.1 0.6 6.3 1.2 1.6 0.4
449 2014 20.7 1.9 2.8 0.3 21.4 1.9 5.1 0.7 8.2 1.3 1.3 0.3

 

Pool 26 - alla
Year
Sago pondweed
American lotus
Broad-leaf arrowhead
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
519
1998
5.6 1.0 1.3 0.3 2.7 0.7 0.5 0.2 0.2 0.2 0.0 0.0
647
1999
0.6 0.3 0.0 0.0 1.5 0.5 0.5 0.2 0.8 0.3 0.1 0.1
392
2000
4.3 1.0 0.8 0.2 2.5 0.8 0.3 0.1 0.3 0.3 0.1 0.1
413
2001
0.8 0.4 0.1 0.1 3.3 0.9 1.5 0.4 0.0 0.0 0.0 0.0
417
2002
1.6 0.6 0.2 0.1 2.5 0.8 1.1 0.4 1.5 0.6 0.4 0.2
420
2003b
7.1 1.3 1.2 0.2 4.9 1.1 1.2 0.4 0.9 0.5 0.3 0.2
550
2004
0.0 0.0 0.0 0.0 1.3 0.5 0.3 0.2 1.0 0.4 0.3 0.2
aAnalysis includes Pool 26 of the Mississippi River and lower Alton Pool of the Illinois River.
b
Data 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
Sago pondweed
American lotus
Broad-leaf arrowhead
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
312
1998
0.0
0.0
0.0
0.0
0.2 0.2 0.1 0.1 0.4 0.3 0.0 0.0
437
1999
0.1
0.1
<0.1
<0.1
1.1 0.5 0.2 0.1 1.4 0.6 0.3 0.1
262
2000
0.0
0.0
0.0
0.0
1.0 0.6 0.1 0.1 0.5 0.4 0.2 0.2
279
2001
0.0
0.0
0.0
0.0
0.3 0.3 0.1 0.1 0.0 0.0 0.0 0.0
215
2002
0.2
0.3
<0.1
<0.1
0.4 0.4 0.2 0.2 2.1 0.9 0.4 0.2
280
2003b
0.0
0.0
0.0
0.0
0.8 0.5 0.2 0.2 1.5 0.7 0.5 0.3
362
2004
0.0
0.0
0.0
0.0
1.8 0.7 0.4 0.3 1.7 0.7 0.6 0.3
aPool 26, Mississippi River
b
Data 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
Sago pondweed
American lotus
Broad-leaf arrowhead
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
207
1998
13.6 2.4 3.1 0.6 6.3 1.7 1.0 0.4 0.0 0.0 0.0 0.0
210
1999
1.4 0.8 0.1 0.1 2.1 1.0 0.9 0.5 0.0 0.0 0.0 0.0
135
2000
9.7 2.6 1.8 0.6 4.4 1.8 0.6 0.3 0.0 0.0 0.0 0.0
134
2001
1.8 1.2 0.3 0.2 7.1 2.2 3.2 1.1 0.0 0.0 0.0 0.0
140
2002
3.4 1.5 0.3 0.2 5.0 1.9 2.2 1.1 0.8 0.8 0.4 0.4
140
2003b
16.0 3.1 2.6 0.6 10.1 2.6 2.4 1.0 0.0 0.0 0.0 0.0
188
2004
0.0 0.0 0.0 0.0 0.6 0.6 0.1 0.1 0.0 0.0 0.0 0.0
aLower Alton Pool, Illinois River
b
Data 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
Sago pondweed
American lotus
Broad-leaf arrowhead
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± 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
0.5 0.3 0.1 0.1 0.0 0.0 0.0 0.0
368
2000
0.0
0.0
0.0
0.0
6.0 1.2 0.7 0.1 0.0 0.0 0.0 0.0
357
2001
0.0
0.0
0.0
0.0
0.3 0.3 0.1 0.1 0.0 0.0 0.0 0.0
369
2002
0.0
0.0
0.0
0.0
1.9 0.7 0.2 0.1 0.4 0.3 0.1 0.1
347
2003b
0.0
0.0
0.0
0.0
0.8 0.5 0.1 0.0 2.1 0.8 0.9 0.4
471
2004
0.0
0.0
0.0
0.0
0.7 0.4 0.1 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.
b
Data were provided by the Illinois Natural History Survey based on a grant from the Illinois Department of Natural Resources.

 


Content manager: Dr. Yao Yin


Page Last Modified: April 3, 2018