Upper Midwest Environmental Sciences Center

UMESC - LTRMP Reports - Macroinvertebrate - Table 4. Mean number of mayflies per square meter by study reach and aquatic area
Macroinvertebrate Update Title Page
 Tables

Table 3.

Mean number of mayflies per square meter by study reach and aquatic strata. For sample sizes, refer to Table 1. The wash frame sieve size was changed from a U.S. Standard Sieve no. 30 (0.595 µm), used in 1992, to a U.S. Standard Sieve no. 16 (1.18 mm) in 1993. SE=standard error.

Study reach
Year
Backwater
contiguous
±
1 SE
Impoundeda
±
1 SE
Side channel
±
1 SE
Main channel
border
±
1 SE
Pool 4
1992
104
22
48
15
30
11
32
28
 
1993
74
18
150
42
29
21
2
2
 
1994
104
21
236
54
104
102
25
25
 
1995
56
13
218
39
21
12
58
58
 
1996
76
23
163
41
2
2
2
2
 
1997
80
19
76
24
0
0
3
2
 
1998
148
26
242
43
2
2
182
179
 
1999
65
15
74
17
63
49
0
0
 
2000
79
18
284
46
61
45
2
2
 
2001
39
11
135
24
0
0
0
0
 
2002
75
24
110
36
12
12
0
0
  2003b
—
—
—
—
—
—
—
—
 
2004
85
18
91
25
71
51
2
2
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
1992
51
14
47
26
11
6
15
6
 
1993
149
65
124
25
111
61
0
0
 
1994
105
30
111
35
62
36
2
2
 
1995
62
20
82
16
8
7
2
2
 
1996
22
11
64
15
11
6
0
0
 
1997
87
22
82
15
53
17
6
6
 
1998
111
32
146
34
115
58
8
8
 
1999
133
47
239
42
339
134
2
2
 
2000
52
17
395
79
285
126
58
51
 
2001
111
24
130
34
52
27
51
32
  2002
45
16
107
24
32
18
79
77
 
2003
65
29
99
24
34
17
14
8
 
2004
71
21
134
24
126
54
0
0


Study reach
Year
Backwater
contiguous
±
1 SE
Impounded
±
1 SE
Side channel
±
1 SE
Main channel
border
±
1 SE
Pool 13
1992
75
16
200
45
54
25
35
15
 
1993
91
24
223
42
147
57
64
48
 
1994
392
60
138
33
23
11
1
1
 
1995
154
32
250
56
135
62
110
88
 
1996
186
34
95
21
407
156
4
3
 
1997
235
43
138
30
154
92
88
43
 
1998
219
48
181
41
140
92
19
13
 
1999
136
40
263
37
66
43
165
89
 
2000
47
22
220
38
232
94
164
125
 
2001
73
20
112
20
10
7
28
22
  2002
314
68
246
58
89
43
22
15
 
2003
103
37
83
18
10
7
53
29
 
2004
63
18
215
51
59
36
109
92



Study reach
Year
Backwater
contiguous
±
1 SE
Impounded
±
1 SE
Side channel
±
1 SE
Main channel
border
±
1 SE
Pool 26
1992
1
1
48
23
21
10
21
9
 
1993
38
10
121
37
0
0
0
0
 
1994
156
33
118
36
9
4
5
3
 
1995
5
3
21
11
—a
—
—a
—
 
1996
8
4
24
9
18
12
11
11
 
1997
120
40
55
15
18
15
0
0
 
1998
74
49
38
23
26
19
18
10
 
1999
21
19
21
6
22
12
32
16
 
2000
3
2
24
9
32
11
28
12
 
2001
7
4
54
18
17
8
0
0
 
2002
9
4
19
5
10
4
65
33
  2003b
—
—
—
—
—
—
—
—
 
2004
6
3
64
28
0
0
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
1992
48
20
18
11
 
1993a
—
—
—
—
 
1994
7
3
21
9
 
1995
10
3
12
6
 
1996
17
7
10
6
 
1997a
—
—
—
—
 
1998
15
10
11
8
 
1999
3
2
3
2
 
2000
17
6
8
5
 
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
1992
21
10
9
3
8
4
 
1993
17
7
22
7
6
3
 
1994
45
13
67
15
12
5
 
1995
2
1
13
4
8
5
 
1996
5
2
29
7
1
1
 
1997
14
6
12
3
4
2
 
1998
12
7
8
4
7
5
 
1999
12
7
9
3
7
5
 
2000
6
6
10
4
8
5
 
2001
5
2
8
4
2
1
 
2002
5
4
12
3
2
1
 
2003b
—
—
—
—
—
—
 
2004
20
10
8
4
3
2
aSampling not conducted in 2003 because of budget constraints.

Content manager: Jennie Sauer


Page Last Modified: April 17, 2018