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.
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
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
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
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
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
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.
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