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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
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.umesc.usgs.gov/reports_publications/ltrmp/macro/tables/table06_mean_zebramussels.html
Page Contact Information: Contacting the Upper Midwest Environmental Sciences Center
Page Last Modified:
October 2, 2007
