Mitigation for the Construction and Operation of Libby Dam

Table A11. Mean zooplankton densities (no./l) (top line) and variances (bottom line) estimated
from 10-20 m. vertical tows made in the Canada area of Libby Reservoir during 2002.
Epischura and Leptodora were measured as number per m 3 .
Month (N) Daphnia Bosmina Diaptomus Cyclops Leptodora Epischura Diaphanosoma
April (3) 0.01
0.01
0.01
0.10
0.00
1.73
0.01
0.00
0.00
0.00
0.01
0.00
3.14
0.00
May (3) 0.22
0.17
0.13
1.53
1.89
67.53
0.08
0.07
0.02
0.03
2.86
10.68
1,931.37
0.01
July (3) 2.15
0.02
0.06
2.82
12.73
11.60
0.10
0.75
0.00
0.00
3.89
54.02
72.30
0.01
August
(3) 2.41
0.02
0.40
10.95
1.90
31.12
0.78
1.03
0.00
0.00
25.49
7.29
2,905.99
0.22
September (3) 0.60
0.15
0.77
10.86
0.00
191.76
6.12
0.10
0.01
0.26
3.35
0.00
17,461.88
5.52
November (3) 3.15 1.37
1.36
3.32
0.00
95.18
0.09
11.95
1.43
2.27
4.24
0.00
16,299.22
0.01
Table A12. Mean zooplankton densities (no./l) (top line) and variances (bottom line) estimated
from 10-20 m. vertical tows made in the Canada area of Libby Reservoir during 2001.
Epischura and Leptodora were measured as number per m 3 .
Month (N) Daphnia Bosmina Diaptomus Cyclops Leptodora Epischura Diaphanosoma
April (3) 0.11 0.06 0.04 4.02 0.00 0.00 0.00
0.00 0.00 0.00 4.37 0.00 0.00 0.00
May (3) 0.23 0.50 0.02 10.02 0.24 62.24 0.01
0.08 0.17 0.00 88.93 0.17 3,105.76 0.00
June (3) 1.36
1.21
1.41
1.30
0.00
0.00
7.88
38.31
6.05
22.31
0.39
0.46
0.00
0.00
July (3) 3.28
3.12
0.05
0.00
0.10
0.00
4.78
3.92
7.55
33.20
6.22
116.19
0.04
0.00
August (3) 2.33
0.56
0.23
0.02
0.41
0.09
2.89
3.09
2.93
8.00
61.40
1,610.80
0.31
0.09
September (3) 5.47
12.65
0.56
0.36
0.50
0.03
3.77
2.51
3.12
5.79
102.47
16,696.95
0.72
0.80
October (3) 0.91
0.06
0.51
0.02
0.93
0.08
5.36
3.21
0.24
0.17
0.00
0.00
0.72
0.07
November (3) 1.59
0.87
0.24
0.03
1.00
0.45
8.19
42.09
0.00
0.00
52.15
984.09
0.12
0.01
157