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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
7.6
1.0
10.5
1.4
4.5
0.7
549
1999
37.3
2.1
5.9
0.4
12.1
1.4
3.4
0.5
8.3
1.2
3.5
0.6
631
2000
39.1
2.0
6.5
0.4
11.8
1.3
3.3
0.4
8.4
1.1
3.5
0.6
646
2001
36.9
1.9
6.0
0.4
9.7
1.2
2.5
0.4
8.7
1.1
3.8
0.6
630
2002
35.0
1.9
5.4
0.3
12.2
1.3
2.7
0.3
10.1
1.2
4.7
0.7
–
2003a
–
–
–
–
–
–
–
–
–
–
–
–
643
2004
30.9
1.8
5.3
0.4
12.0
1.3
3.4
0.4
12.1
1.3
7.2
0.9
446
2005
37.3
2.3
10.1
0.8
16.1
1.8
5.2
0.7
8.9
1.4
4.4
0.8
441
2006
43.7
2.4
10.0
0.7
17.4
1.8
7.4
0.9
13.9
1.7
8.4
1.2
438
2007
46.5
2.4
8.6
0.5
16.4
1.8
6.3
0.9
15.6
1.8
9.0
1.2
450
2008
52.2
2.4
10.9
0.6
18.1
1.8
5.2
0.6
15.7
1.7
7.7
1.0
aPoolwide analysis was not calculated because no data were collected for the isolated backwater and Lake Pepin strata.

 

Upper 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
187
1998
21.8
3.0
2.6
0.4
1.1
0.8
1.1
0.8
2.3
1.1
1.2
0.6
213
1999
18.5
2.7
2.4
0.4
1.6
0.9
0.5
0.3
4.7
1.5
1.9
0.8
245
2000
13.8
2.2
1.3
0.2
1.3
0.7
1.1
0.7
3.1
1.1
1.5
0.7
245
2001
7.0
1.6
0.6
0.2
0.8
0.6
0.2
0.1
3.7
1.2
1.1
0.5
245
2002
9.7
1.9
1.1
0.2
1.6
0.8
0.4
0.2
3.5
1.2
2.2
0.9
–
2003a
–
–
–
–
–
–
–
–
–
–
–
–
251
2004
7.1
1.6
1.0
0.2
1.0
0.6
0.3
0.2
2.8
1.1
0.8
0.4
199
2005
10.0
2.1
1.2
0.3
2.8
1.2
0.6
0.2
3.5
1.3
0.9
0.4
200
2006
14.6
2.5
2.5
0.6
0.9
0.7
0.5
0.4
4.0
1.4
1.8
0.8
198
2007
17.5
2.7
2.1
0.4
1.5
0.9
1.2
0.7
8.2
2.0
4.4
1.3
200
2008
25.1
3.1
3.5
0.6
1.8
0.9
0.4
0.2
8.2
2.0
3.1
1.0
aAnalysis was not completed because no data were collected for the isolated backwater and Lake Pepin strata.

 

Lower 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
288
1998
49.1
3.0
10.0
0.8
24.9
2.6
11.3
1.5
14.8
2.1
6.6
1.2
302
1999
48.9
2.9
7.8
0.5
17.9
2.2
5.2
0.8
10.9
1.8
4.7
1.0
354
2000
55.3
2.7
8.8
0.5
17.1
2.0
3.7
0.5
11.4
1.7
4.8
0.9
351
2001
57.1
2.7
9.6
0.5
13.8
1.8
3.8
0.6
11.9
1.7
5.7
1.0
355
2002
50.9
2.7
7.7
0.4
17.4
2.0
3.9
0.5
12.8
1.8
5.7
1.0
–
2003a
–
–
–
–
–
–
–
–
–
–
–
–
360
2004
46.4
2.6
8.0
0.5
17.2
2.0
5.0
0.7
17.2
2.0
11.3
1.5
227
2005
57.4
3.3
17.1
1.4
25.4
2.9
8.5
1.3
11.8
2.2
6.9
1.5
230
2006
63.3
3.2
14.7
1.0
28.0
3.0
11.3
1.5
19.0
2.0
12.7
2.0
230
2007
67.3
3.1
13.2
0.7
26.1
2.9
9.4
1.4
18.6
2.6
11.1
1.8
230
2008
70.2
3.0
16.0
0.9
29.1
3.0
8.5
1.1
18.7
2.6
10.4
1.7
aAnalysis 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
10.4
1.2
11.2
1.4
5.6
0.8
595
1999
58.1
2.0
10.5
0.5
19.0
1.6
9.8
1.0
15.0
1.5
8.5
0.9
649
2000
47.7
2.0
8.3
0.4
18.9
1.5
7.7
0.8
11.5
1.3
4.9
0.7
670
2001
47.5
1.9
7.8
0.4
18.1
1.5
6.7
0.7
9.9
1.2
3.7
0.5
644
2002
53.4
2.0
10.5
0.5
20.7
1.6
8.5
0.9
16.4
1.5
7.4
0.8
649
2003
55.2
2.0
9.9
0.4
21.4
1.6
10.6
1.0
17.7
1.5
10.1
1.0
649
2004
58.9
1.9
11.6
0.5
23.2
1.7
10.3
0.9
16.5
1.5
8.0
0.9
450
2005
70.6
2.2
16.7
0.6
29.1
2.2
10.9
1.1
20.0
1.9
9.3
1.0
444
2006
71.4
2.2
16.8
0.6
31.1
2.2
15.0
1.4
20.0
1.9
10.6
1.3
448
2007
70.9
2.2
17.0
0.7
38.8
2.3
17.9
1.4
24.0
2.0
16.2
1.5
447
2008
74.8
2.1
13.9
0.5
33.9
2.2
11.5
1.0
20.1
1.9
9.2
1.0

 

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
18.2
1.7
10.8
1.2
3.4
0.8
2.3
0.6
550
1999
41.9
2.1
8.0
0.5
20.4
1.7
12.1
1.2
4.7
0.9
2.0
0.5
578
2000
43.0
2.1
8.3
0.5
22.0
1.7
11.8
1.1
4.6
0.9
3.2
0.7
606
2001
41.7
2.0
9.4
0.6
23.7
1.7
13.4
1.2
5.7
0.9
3.6
0.7
579
2002
43.0
2.1
10.7
0.6
25.0
1.8
10.0
0.9
5.0
0.9
3.5
0.7
580
2003
40.5
2.0
9.9
0.6
27.4
1.9
12.5
1.1
7.3
1.1
4.9
0.8
648
2004
46.6
2.0
10.1
0.5
27.4
1.8
11.0
1.0
7.0
1.0
4.3
0.7
450
2005
56.3
2.3
13.7
0.7
28.8
2.1
12.7
1.2
6.0
1.1
3.4
0.7
450
2006
60.8
2.3
12.8
0.6
31.8
2.2
19.1
1.6
10.1
1.4
6.3
1.1
444
2007
59.5
2.3
15.3
0.8
30.2
2.2
18.9
1.7
11.3
1.5
6.6
1.1
448
2008
60.6
2.3
10.8
0.5
26.1
2.1
8.2
0.9
7.6
1.3
2.8
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
1.5
0.3
4.4
0.9
1.5
0.4
647
1999
0.6
0.3
<0.1
<0.1
1.5
0.5
0.7
0.3
4.1
0.8
3.0
0.6
397
2000
5.7
1.2
1.3
0.3
4.3
1.0
1.0
0.2
5.7
1.2
2.5
0.6
413
2001
2.4
0.8
0.3
0.1
4.8
1.1
2.1
0.6
7.8
1.3
3.2
0.7
417
2002
2.3
0.7
0.4
0.1
4.0
1.0
1.8
0.6
10.1
1.5
6.4
1.1
420
2003b
9.4
1.4
3.3
0.6
6.9
1.2
2.2
0.5
17.5
1.9
11.6
1.4
550
2004
0.6
0.3
0.1
0.0
2.1
0.6
0.6
0.2
9.8
1.3
4.7
0.8
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
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
0.4
0.2
4.6
1.2
1.7
0.5
437
1999
0.1
0.1
<0.1
<0.1
1.1
0.5
0.3
0.1
7.3
1.3
5.4
1.0
257
2000
0.2
0.3
<0.1
<0.1
2.7
1.0
0.6
0.2
7.5
1.7
3.9
1.0
279
2001
0.0
0.0
0.0
0.0
0.8
0.5
0.2
0.1
1.6
0.8
0.6
0.3
277
2002
0.2
0.3
<0.1
<0.1
2.5
0.9
0.8
0.4
7.4
1.6
5.0
1.2
280
2003b
0.0
0.0
0.0
0.0
1.5
0.7
0.5
0.3
6.9
1.5
4.3
1.1
362
2004
0.0
0.0
0.0
0.0
2.8
0.9
0.9
0.3
10.9
1.6
6.0
1.1
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
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
3.1
0.8
4.2
1.4
1.4
0.6
210
1999
1.4
0.8
0.1
0.1
2.1
1.0
1.3
0.6
0.0
0.0
0.0
0.0
135
2000
12.4
2.8
2.9
0.8
6.2
2.1
1.4
0.5
3.5
1.6
0.9
0.4
134
2001
5.4
2.0
0.7
0.3
9.8
2.6
4.6
1.4
15.6
3.2
6.4
1.6
140
2002
5.0
1.9
0.8
0.3
5.9
2.0
2.9
1.2
13.4
2.9
8.1
2.1
140
2003b
21.0
3.5
7.4
1.6
13.4
2.9
4.4
1.3
30.6
3.9
20.6
3.1
188
2004
1.3
0.8
0.2
0.1
1.3
0.8
0.3
0.2
8.5
2.0
3.1
0.9
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
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
0.1
0.1
2.6
0.7
1.1
0.4
538
1999
0.0
0.0
0.0
0.0
0.5
0.3
0.1
0.1
3.1
0.8
3.1
0.8
368
2000
0.0
0.0
0.0
0.0
6.0
1.2
1.2
0.3
1.3
0.6
0.7
0.4
357
2001
0.0
0.0
0.0
0.0
0.3
0.3
0.2
0.2
0.9
0.5
0.9
0.5
369
2002
0.0
0.0
0.0
0.0
2.2
0.8
0.5
0.2
2.6
0.8
2.1
0.7
347
2003b
0.0
0.0
0.0
0.0
1.3
0.6
0.4
0.2
2.6
0.9
1.7
0.6
471
2004
0.0
0.0
0.0
0.0
1.0
0.5
0.3
0.2
0.3
0.3
0.2
0.2
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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