Upper Midwest Environmental Sciences Center

UMESC - LTRMP Reports - Macroinvertebrate - Table 6. Mean number of midges per square meter by study reach and aquatic area
Macroinvertebrate Update Title Page
 Tables

Table 5.

Mean number of midges 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
1993
203
32
364
38
87
50
40
34
 
1994
233
61
182
22
135
80
23
21
 
1995
116
17
78
14
12
5
10
6
 
1996
47
12
37
11
33
17
25
13
 
1997
81
20
190
43
5
4
7
7
 
1998
98
12
324
51
24
14
2
2
 
1999
107
22
243
36
33
17
56
46
 
2000
82
14
59
12
77
22
77
65
 
2001
32
9
88
15
31
20
0
0
 
2002
90
20
68
15
52
36
0
0
 
2003b
—
—
—
—
—
—
—
—
 
2004
89
15
113
20
44
28
64
30
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
1993
40
11
66
8
42
13
10
8
 
1994
38
11
12
7
57
50
3
2
 
1995
12
4
13
4
9
7
0
0
 
1996
19
6
20
5
1
1
4
3
 
1997
20
7
39
7
10
6
6
6
 
1998
100
18
82
11
83
40
33
15
 
1999
46
16
53
14
24
7
38
34
 
2000
84
23
20
7
32
13
19
12
 
2001
97
25
26
7
8
4
0
0
  2002
72
13
68
17
36
18
54
32
  2003
92
32
13
3
6
2
2
2
 
2004
87
25
625
138
141
67
4
4


Study reach
Year
Backwater
contiguous
±
1 SE
Impounded
±
1 SE
Side channel
±
1 SE
Main channel
border
±
1 SE
Pool 13
1993
237
56
916
130
18
9
190
135
 
1994
144
43
43
33
8
4
50
40
 
1995
93
18
19
7
2
2
3
2
 
1996
53
14
5
3
12
8
4
4
 
1997
213
99
19
6
0
0
10
9
 
1998
148
37
61
29
3
2
33
22
 
1999
698
220
11
4
5
4
4
4
 
2000
1664
223
63
30
25
18
8
4
 
2001
56
14
22
21
3
3
0
0
 
2002
570
137
12
6
3
2
0
0
 
2003
416
80
4
2
0
0
0
0
 
2004
625
135
137
67
11
4
0
0


Study reach
Year
Backwater
contiguous
±
1 SE
Impounded
±
1 SE
Side channel
±
1 SE
Main channel
border
±
1 SE
Pool 26
1993
81
17
136
26
0
0
0
0
 
1994
90
26
46
15
2
1
9
8
 
1995
48
18
31
15
—a
—
—a
—
 
1996
112
37
48
10
6
4
11
7
 
1997
106
46
39
11
0
0
6
4
 
1998
34
11
30
12
1
1
1
1
 
1999
59
19
42
10
9
6
1
1
 
2000
82
14
78
15
27
8
17
6
 
2001
267
68
149
22
18
6
0
0
 
2002
255
58
313
52
19
9
28
9
 
2003b
—
—
—
—
—
—
—
—
 
2004
104
24
453
53
14
11
15
8
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
1993a
—
—
—
—
 
1994
4
2
8
4
 
1995
41
12
10
4
 
1996
21
4
3
2
 
1997a
—
—
—
—
 
1998
5
2
4
2
 
1999
2
1
6
3
 
2000
119
30
9
4
 
2001b
—
—
—
—
aSampling not conducted in 1993 or 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
1993
92
22
26
5
27
10
 
1994
51
9
75
14
58
10
 
1995
54
24
50
14
15
4
 
1996
97
21
136
38
175
64
 
1997
188
58
55
27
64
22
 
1998
244
68
21
9
25
6
 
1999
120
43
25
7
13
4
 
2000
177
62
25
6
18
4
 
2001
132
30
73
26
12
4
 
2002
264
51
90
31
21
5
 
2003a
—
—
—
—
—
—
 
2004
167
41
110
27
30
8
aSampling not conducted in 2003 because of budget constraints.

Content manager: Jennie Sauer


Page Last Modified: April 17, 2018