Upper Midwest Environmental Sciences Center

Table 2. Frequency - lifeforms
Vegetation Update Title Page
tree_ftree_f Tables

Table 2.   Percent frequency of occurrence and abundance index or percent cover of submersed, rooted, floating–leaf, and emergent vegetation 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
Submersed aquatic vegetation
Rooted, floating-leaf vegetation
Emergent vegetation
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
506
1998
39.3
2.2
7.6
0.6
16.2
1.6
5.9 0.8
10.5
1.4
3.4 0.6
549
1999
37.3
2.1
5.9
0.4
12.1
1.4
2.2 0.4
8.3
1.2
2.6 0.5
631
2000
39.1
2.0
6.5
0.4
11.8
1.3
2.1 0.4
8.4
1.1
2.7 0.5
646
2001
36.9
1.9
6.0
0.4
9.7
1.2
1.5 0.3
8.7
1.1
2.9 0.5
630
2002
35.0
1.9
5.4
0.3
12.2
1.3
1.5 0.2
10.1
1.2
3.7 0.6
2003a
643
2004
30.9
1.8
5.3
0.4
12.0
1.3
2.2 0.4
12.1
1.3
6.0 0.8
446
2005
37.3
2.3
10.1
0.8
16.1
1.8
3.6 0.6
8.9
1.4
3.5 0.7
441
2006
43.7
2.4
10.0
0.7
17.4
1.8
5.7 0.8
13.9
1.7
7.0 1.0
438
2007
46.5
2.4
8.6
0.5
16.4
1.8
4.6 0.8
15.6
1.8
7.5 1.1
450
2008
52.2
2.4
10.9
0.6
18.1
1.8
3.4 0.5
15.7
1.7
6.1 0.9
449 2009 59.0 2.3 13.7 0.8 22.3 2.0 4.3 0.6 16.9 1.8 7.7 1.1
448 2010 62.5 2.3 13.0 0.7 21.4 1.9 3.6 0.5 17.2 1.8 6.1 0.9
449 2011 56.1 2.4 10.3 0.5 16.3 1.8 2.7 0.4 20.7 1.9 6.1 0.8
450 2012 43.8 2.4 9.2 0.6 16.5 1.8 2.7 0.4 20.1 1.9 4.7 0.7
449 2013 46.8 2.4 8.5 0.5 12.0 1.5 1.6 0.3 16.9 1.8 3.4 0.6
447 2014 48.7 2.4 8.9 0.6 16.4 1.8 1.9 0.2 17.8 1.8 4.0 0.6
aPoolwide analysis was not calculated because no data were collected for the isolated backwater and Lake Pepin strata.

 

Upper Pool 4a
Year
Submersed aquatic vegetation
Rooted, floating-leaf vegetation
Emergent vegetation
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
130
1998
23.0 3.7 3.0 0.5 2.7 1.4 2.5 1.3 5.8 2.1 2.4 1.0
148
1999
21.0 3.4 2.5 0.4 4.0 1.6 0.8 0.3 12.0 2.7 3.7 1.3
170
2000
12.4 2.5 1.3 0.3 3.4 1.4 2.5 1.1 7.8 2.1 3.0 1.1
170
2001
9.7 2.3 0.9 0.2 2.0 1.1 0.2 0.1 9.4 2.3 2.0 0.7
170
2002
12.3 2.5 1.6 0.4 4.1 1.5 0.5 0.2 6.8 1.9 4.5 1.5
2003b
174
2004
6.0 1.8 0.6 0.2 2.7 1.2 0.5 0.3 5.2 1.7 1.2 0.6
140
2005
9.8 2.5 1.5 0.4 4.5 1.8 0.5 0.2 3.8 1.6 1.0 0.5
140
2006
8.7 2.4 2.5 1.0 2.3 1.3 1.0 0.6 7.6 2.3 3.4 1.3
138
2007
21.3 3.5 3.0 0.6 3.8 1.6 2.7 1.2 15.8 3.1 6.6 1.7
140
2008
27.7 3.8 4.8 0.9 4.5 1.8 0.5 0.2 18.3 3.3 5.6 1.5
139 2009 37.4 4.1 5.8 0.8 2.3 1.3 0.5 0.3 16.7 3.2 9.2 2.2
140 2010 39.2 4.2 5.8 0.7 1.5 1.0 0.2 0.1 18.8 3.3 8.3 2.0
140 2011 44.0 4.2 6.6 0.8 1.5 1.0 0.2 0.1 11.7 2.7 1.3 0.3
140 2012 22.6 3.6 3.2 0.6 4.5 1.8 0.5 0.2 8.4 2.4 1.6 0.6
140 2013 25.9 3.7 3.2 0.5 3.4 1.5 0.3 0.2 10.0 2.6 2.0 0.8
139 2014 25.6 3.7 3.4 0.5 2.3 1.3 0.2 0.1 8.1 2.3 2.0 0.8
aDoes not include Lake Pepin
bAnalysis was not completed because no data were collected for the isolated backwater and Lake Pepin strata.

 

Lower Pool 4a
Year
Submersed aquatic vegetation
Rooted, floating-leaf vegetation
Emergent vegetation
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
259
1998
58.1 3.1 11.9 0.9 30.2 2.9 10.6 1.5 18.0 2.4 6.2 1.2
267
1999
57.4 3.0 9.1 0.5 21.7 2.5 4.2 0.7 13.2 2.1 4.3 1.0
279
2000
57.2 3.0 9.3 0.6 20.8 2.4 2.4 0.3 13.8 2.1 4.4 0.9
276
2001
60.4 3.0 10.3 0.6 16.8 2.3 3.0 0.6 14.5 2.1 5.4 1.0
280
2002
56.3 3.0 8.5 0.5 21.1 2.4 2.6 0.4 15.2 2.2 5.4 1.0
2003b
283
2004
54.3 3.0 9.5 0.6 20.8 2.4 4.0 0.7 20.8 2.4 11.7 1.6
177
2005
68.0 3.5 20.5 1.6 30.8 3.5 7.2 1.3 14.4 2.7 6.9 1.7
180
2006
73.3 3.3 17.5 1.2 34.0 3.5 10.3 1.5 23.1 3.2 13.1 2.2
180
2007
76.1 3.2 15.3 0.8 31.6 3.5 8.2 1.5 21.7 3.1 10.5 1.9
180
2008
80.9 3.0 18.8 1.0 35.3 3.6 6.8 1.1 22.7 3.1 10.4 1.9
180 2009 83.7 2.8 23.4 1.4 44.0 3.7 8.4 1.1 27.5 3.3 11.9 2.0
179 2010 81.9 2.9 20.4 1.1 42.6 3.7 6.2 0.9 26.7 3.3 9.0 1.5
180 2011 77.4 3.1 15.6 0.8 30.6 3.4 5.1 0.8 36.8 3.6 12.4 1.9
180 2012 72.3 3.4 16.9 1.1 33.6 3.5 5.6 1.0 39.9 3.7 9.5 1.5
180 2013 71.2 3.4 14.5 0.8 22.3 3.1 3.1 0.7 32.0 3.5 6.8 1.3
179 2014 74.5 3.3 15.2 1.0 31.5 3.5 3.7 0.5 35.0 3.6 8.1 1.4
aDoes not include Lake Pepin
b
Analysis was not completed because no data were collected for the isolated backwater and Lake Pepin strata.


Lake Pepin
Year
Submersed aquatic vegetation
Rooted, floating-leaf vegetation
Emergent vegetation
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
14.7 3.6 2.1 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
150
2000
23.3 3.5 2.7 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
150
2001
15.1 2.9 1.9 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
150
2002
12.7 2.7 1.6 0.4 1.2 1.1 0.1 0.1 1.3 0.9 0.1  
2003a
154
2004
8.1 2.2 1.1 0.3 0.0 0.0 0.0 0.0 0.9 0.8 0.1 0.1
109
2005
9.6 2.8 1.0 0.3 0.0 0.0 0.0 0.0 2.5 1.5 0.2 0.2
110
2006
17.7 3.7 2.3 0.5 0.0 0.0 0.0 0.0 1.2 1.1 0.1 0.1
110
2007
18.0 3.7 2.0 0.5 0.0 0.0 0.0 0.0 3.5 1.8 2.1 1.2
110
2008
22.4 4.0 2.7 0.5 0.0 0.0 0.0 0.0 1.2 1.1 0.1 0.1
110 2009 34.5 4.6 4.4 0.7 0.0 0.0 0.0 0.0 0.5 0.7 0.4 0.5
110 2010 46.2 4.8 6.7 0.8 0.0 0.0 0.0 0.0 1.2 1.1 0.4 0.3
110 2011 29.9 4.4 4.2 0.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
110 2012 12.4 3.2 1.5 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
109 2013 20.4 3.9 2.1 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
110 2014 20.9 3.9 2.4 0.5 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
Submersed aquatic vegetation
Rooted, floating-leaf vegetation
Emergent vegetation
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
516
1998
49.3
2.2
10.2
0.6
18.0
1.7
8.6 1.0 11.2 1.4 4.4 0.7
595
1999
58.1
2.0
10.5
0.5
19.0
1.6
7.9 0.9 15.0 1.5 7.0 0.8
649
2000
47.7
2.0
8.3
0.4
18.9
1.5
5.8 0.7 11.5 1.3 3.8 0.6
670
2001
47.5
1.9
7.8
0.4
18.1
1.5
4.9 0.6 9.9 1.2 2.7 0.4
644
2002
53.4
2.0
10.5
0.5
20.7
1.6
6.4 0.7 16.4 1.5 5.8 0.7
649
2003
55.2
2.0
9.9
0.4
21.4
1.6
8.4 0.9 17.7 1.5 8.3 0.9
649
2004
58.9
1.9
11.6
0.5
23.2
1.7
8.0 0.8 16.5 1.5 6.3 0.7
450
2005
70.6
2.2
16.7
0.6
29.1
2.2
8.0 0.9 20.0 1.9 7.3 0.9
444
2006
71.4
2.2
16.8
0.6
31.1
2.2
11.9 1.2 19.6 1.9 8.7 1.1
448
2007
70.9
2.2
17.0
0.7
38.8
2.3
14.0 1.3 24.0 2.0 13.8 1.4
447
2008
74.8
2.1
13.9
0.5
33.9
2.2
8.2 0.9 20.1 1.9 7.2 0.9
447 2009 80.4 1.9 17.0 0.6 39.4 2.3 9.8 0.9 26.8 2.1 11.9 1.2
444 2010 88.6 1.5 25.6 0.8 36.6 2.3 9.1 0.9 28.1 2.1 9.8 1.0
447 2011 77.6 2.0 14.8 0.5 26.8 2.1 6.2 0.8 18.6 1.8 4.2 0.6
450 2012 73.0 2.1 18.7 0.7 21.1 1.9 5.7 0.8 22.9 2.0 6.5 0.8
450 2013 70.2 2.2 14.4 0.6 27.3 2.1 5.5 0.7 27.8 2.1 6.3 0.7
449 2014 73.3 2.1 13.6 0.4 29.5 2.2 5.4 0.6 32.9 2.2 8.7 0.9

 

Pool 13
Year
Submersed aquatic vegetation
Rooted, floating-leaf vegetation
Emergent vegetation
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
531
1998
43.2 2.2 7.9 0.5 18.4 1.7 9.0 1.1 3.4 0.8 1.9 0.5
550
1999
42.1 2.1 8.0 0.5 20.4 1.7 10.0 1.1 4.8 0.9 1.5 0.4
578
2000
43.3 2.1 8.4 0.5 22.3 1.7 9.6 1.0 4.7 0.9 2.8 0.6
606
2001
42.0 2.0 9.4 0.6 23.9 1.7 11.1 1.1 5.8 1.0 3.1 0.6
579
2002
43.2 2.1 10.7 0.6 25.1 1.8 7.5 0.8 5.0 0.9 3.1 0.6
580
2003
40.6 2.0 9.9 0.6 27.5 1.9 9.7 1.0 7.2 1.1 4.1 0.7
648
2004
46.9 2.0 10.2 0.6 27.7 1.8 8.4 0.8 6.9 1.0 3.5 0.6
450
2005
56.9 2.4 13.8 0.7 29.2 2.2 9.9 1.1 6.0 1.1 2.8 0.6
450
2006
61.4 2.3 12.9 0.6 32.2 2.2 16.0 1.4 10.1 1.4 5.1 0.9
444
2007
59.6 2.3 15.4 0.8 30.5 2.2 16.0 1.5 11.4 1.5 5.5 0.9
448
2008
61.4 2.3 10.9 0.5 26.7 2.1 5.7 0.7 7.5 1.3 2.0 0.5
443 2009 63.5 2.3 16.1 0.8 34.6 2.3 13.9 1.3 10.0 1.4 6.0 1.0
448 2010 62.9 2.3 15.5 0.7 29.8 2.2 13.3 1.3 11.6 1.5 6.2 1.0
450 2011 57.6 2.3 12.1 0.6 25.4 2.1 5.8 0.8 11.2 1.5 3.3 0.6
448 2012 54.8 2.4 15.8 0.9 22.8 2.0 8.7 1.1 7.7 1.3 3.4 0.7
447 2013 53.2 2.4 11.7 0.7 30.0 2.2 6.6 0.8 9.2 1.4 3.1 0.6
449 2014 50.9 2.4 10.7 0.6 28.2 2.1 8.8 0.9 10.4 1.4 3.0 0.6

 

Pool 26 - alla
Year
Submersed aquatic vegetation
Rooted, floating-leaf vegetation
Emergent vegetation
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
519
1998
6.1 1.1 1.6 0.3 5.2 1.0 1.0 0.3
4.4
0.9
1.1 0.3
647
1999
0.6 0.3 0.0 0.0 1.5 0.5 0.6 0.2
4.1
0.8
2.6 0.6
397
2000
5.7 1.2 1.3 0.3 4.3 1.0 0.5 0.1
5.7
1.2
2.0 0.5
413
2001
2.4 0.8 0.3 0.1 4.8 1.1 1.7 0.5
7.8
1.3
2.4 0.6
417
2002
2.3 0.7 0.4 0.1 4.0 1.0 1.3 0.5
10.1
1.5
5.3 1.0
420
2003b
9.4 1.4 3.3 0.6 6.9 1.2 1.5 0.4
17.5
1.9
9.8 1.3
550
2004
0.6 0.3 0.1 0.0 2.1 0.6 0.4 0.2
9.8
1.3
3.7 0.7
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
Submersed aquatic vegetation
Rooted, floating-leaf vegetation
Emergent vegetation
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
312
1998
0.5 0.4 0.1 0.1 1.2 0.6 0.3 0.2 4.6 1.2 1.2 0.4
437
1999
0.1 0.1 0.0 0.0 1.1 0.5 0.2 0.1 7.3 1.3 4.6 0.9
257
2000
0.2 0.3 0.0 0.0 2.7 1.0 0.3 0.1 7.5 1.7 3.2 0.9
279
2001
0.0 0.0 0.0 0.0 0.8 0.5 0.1 0.1 1.6 0.8 0.4 0.3
277
2002
0.2 0.3 0.0 0.0 2.5 0.9 0.6 0.3 7.4 1.6 4.2 1.1
280
2003b
0.0 0.0 0.0 0.0 1.5 0.7 0.3 0.2 6.9 1.5 3.7 1.0
362
2004
0.0 0.0 0.0 0.0 2.8 0.9 0.6 0.3 10.9 1.6 5.0 1.0
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
Submersed aquatic vegetation
Rooted, floating-leaf vegetation
Emergent vegetation
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
207
1998
14.1 2.4 3.9 0.8 10.9 2.2 2.0 0.6 4.2 1.4 0.9 0.5
210
1999
1.4 0.8 0.1 0.1 2.1 1.0 1.0 0.6 0.0 0.0 0.0 0.0
135
2000
12.4 2.8 2.9 0.8 6.2 2.1 0.8 0.3 3.5 1.6 0.5 0.3
134
2001
5.4 2.0 0.7 0.3 9.8 2.6 3.7 1.2 15.6 3.2 4.8 1.4
140
2002
5.0 1.9 0.8 0.3 5.9 2.0 2.3 1.1 13.4 2.9 6.7 1.8
140
2003b
21.0 3.5 7.4 1.6 13.4 2.9 3.0 1.1 30.6 3.9 17.5 2.8
188
2004
1.3 0.8 0.2 0.1 1.3 0.8 0.1 0.1 8.5 2.0 2.2 0.8
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
Submersed aquatic vegetation
Rooted, floating-leaf vegetation
Emergent vegetation
n
 
Frq
± SE
AI
± SE
Frq
± SE
Cov
± SE
Frq
± SE
Cov
± SE
464
1998
0.0 0.0 0.0 0.0 0.3 0.3 0.0 0.0 2.6 0.7 0.9 0.3
538
1999
0.0 0.0 0.0 0.0 0.5 0.3 0.1 0.1 3.1 0.8 2.8 0.7
368
2000
0.0 0.0 0.0 0.0 6.0 1.2 0.7 0.1 1.3 0.6 0.6 0.3
357
2001
0.0 0.0 0.0 0.0 0.3 0.3 0.1 0.1 0.9 0.5 0.8 0.5
369
2002
0.0 0.0 0.0 0.0 2.2 0.8 0.3 0.1 2.6 0.8 1.9 0.6
347
2003b
0.0 0.0 0.0 0.0 1.3 0.6 0.2 0.1 2.6 0.9 1.4 0.5
471
2004
0.0 0.0 0.0 0.0 1.0 0.5 0.2 0.1 0.3 0.3 0.2 0.1
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