Upper Midwest Environmental Sciences Center

UMESC - LTRMP Reports - Macroinvertebrate - Table 7. Mean number of zebra mussels per square meter by study reach and aquatic area
Macroinvertebrate Update Title Page
 Tables

Table 6.

Mean number of zebra mussels per square meter by study reach and aquatic strata. For sample sizes, refer to Table 1. SE=standard error.


Study reach
Year
Backwater
contiguous
±
1 SE
Impoundeda
±
1 SE
Side channel
±
1 SE
Main channel
border
±
1 SE
Pool 4
1995
1
1
34
34
0
0
17
17
 
1996
0
0
159
156
2
2
13
10
 
1997
3
2
1
1
7
5
673
603
 
1998
1
1
110
110
19
17
609
396
 
1999
17
10
45
40
21
17
17
14
 
2000
1
1
14
14
16
11
440
423
 
2001
2
1
321
302
0
0
0
0
 
2002
40
25
1
1
0
0
23
23
 
2003b
—
—
—
—
—
—
—
—
 
2004
1
0.5
3
2
2
2
8
3
aImpounded area for Pool 4 is Lake Pepin, a Tributary Delta Lake.
bSampling not conducted in 2003 because of budget constraints.


Study reach
Year
Backwater
contiguous
±
1 SE
Impounded
±
1 SE
Side channel
±
1 SE
Main channel
border
±
1 SE
Pool 8
1995
0
0
0
0
1
1
0
0
 
1996
0
0
1
1
1
1
0
0
 
1997
3
2
37
15
29
17
6
4
 
1998
1
1
43
27
1
1
56
39
 
1999
34
21
1553
1115
326
182
81
54
 
2000
1
1
825
413
1014
690
225
219
 
2001
8
6
1609
953
543
536
26
14
  2002
14
14
337
178
158
124
12
8
  2003
0
0
12
3
2
2
0
0
 
2004
5
4
15
6
5
5
0
0


Study reach
Year
Backwater
contiguous
±
1 SE
Impounded
±
1 SE
Side channel
±
1 SE
Main channel
border
±
1 SE
Pool 13
1995
1
1
17
10
5
5
18
15
 
1996
6
6
15
5
18
18
28
15
 
1997
2
1
755
685
7
6
1762
1141
 
1998
25
25
157
111
158
158
203
148
 
1999
171
155
974
503
12
6
399
399
 
2000
1
1
223
144
246
180
360
359
 
2001
4
2
898
306
3
3
308
271
 
2002
3
2
962
394
268
251
31
20
 
2003
0
0
3
2
3
3
5
5
 
2004
263
258
2388
691
69
40
96
70


Study reach
Year
Backwater
contiguous
±
1 SE
Impounded
±
1 SE
Side channel
±
1 SE
Main channel
border
±
1 SE
Pool 26
1995
0
0
4
3
—a
—
—a
—
 
1996
0
0
11
11
0
0
0
0
 
1997
0
0
0
0
2
1
1
1
 
1998
0
0
418
310
0
0
25
23
 
1999
0
0
7
7
0
0
2
2
 
2000
0
0
0
0
5
2
175
170
 
2001
0
0
6
4
14
13
4
3
 
2002
0
0
0
0
0
0
0
0
 
2003b
—
—
—
—
—
—
—
—
 
2004
0
0
0
0
5
4
0
0
aSampling not completed because of high water.
bSampling not conducted in 2003 because of budget constraints.

 

Study reach
Year
Side channel
±
1 SE
Main channel
border
±
1 SE
Open River Reach
1995
0
0
3
2
 
1996
3
2
0
0
 
1997a
—
—
—
—
 
1998
1
0
22
19
 
1999
1
1
113
84
 
2000
16
15
78
71
 
2001b
—
—
—
—
a Sampling not conducted in 1997 because of high water.
bSampling discontinued in 2001.

 

Study reach
Year
Backwater
contiguous
±
1 SE
Side channel
±
1 SE
Main channel
border
±
1 SE
La Grange Pool
1995
0
0
2
2
16
16
 
1996
0
0
1
1
1
1
 
1997
0
0
0
0
0
0
 
1998
0
0
8
4
3
1
 
1999
0
0
0
0
0
0
 
2000
0
0
0
0
2
2
 
2001
0
0
0
0
<1
<1
 
2002
0
0
0
0
0
0
 
2003a
—
—
—
—
—
—
2004
0
0
0
0
0
0
aSampling not conducted in 2003 because of budget constraints.

Content manager: Jennie Sauer

July 18, 2006
Page Last Modified: April 17, 2018