Table 4. Mean abundance θ estimates for species and community metrics selected as targets for sample design evaluation. Two estimates are provided for each species at each within-site effort level. The first estimate was generated using fixed timing of surveys, whereas the second estimate was generated using variable timing of surveys. The number of surveys is indicated by r. Target codes are as in Fig. 2. Variance estimates are derived from data collected near Calling Lake, Alberta, Canada from 1993 to 1998.

Target
Four stations
 
Nine stations
 
16 stations
 
 
 
 
r = 1
r = 2
r = 3
r = 4
 
r = 1
r = 2
r = 3
r = 4
 
r = 1
r = 2
r = 3
r = 4
BCCH
0.299
0.291
0.163
0.214
0.163
0.163
0.153
0.153
 
0.380
0.377
0.259
0.341
0.258
0.287
0.281
0.281
 
0.500
0.572
0.347
0.525
0.417
0.457
0.458
0.458
 
BGNW
1.694
1.598
1.729
1.574
1.483
1.575
1.579
1.579
 
3.880
3.638
3.963
3.586
3.392
3.652
3.639
3.639
 
7.139
6.420
7.181
6.561
6.185
6.566
6.563
6.563
 
BHCO
0.293
0.294
0.228
0.205
0.181
0.183
0.172
0.172
 
0.463
0.461
0.407
0.394
0.333
0.374
0.365
0.365
 
0.806
0.718
0.667
0.637
0.556
0.601
0.604
0.604
 
GRJA
0.389
0.334
0.194
0.186
0.130
0.140
0.108
0.108
 
0.389
0.349
0.194
0.215
0.130
0.154
0.125
0.125
 
0.500
0.440
0.250
0.364
0.167
0.286
0.229
0.229
 
PIWO
0.250
0.208
0.125
0.118
0.083
0.084
0.077
0.077
 
0.375
0.252
0.188
0.158
0.125
0.125
0.117
0.117
 
0.417
0.336
0.208
0.206
0.139
0.194
0.188
0.188
 
WBNU
0.167
0.182
0.083
0.092
0.056
0.063
0.049
0.049
 
0.167
0.211
0.083
0.115
0.083
0.080
0.066
0.066
 
0.167
0.236
0.083
0.134
0.111
0.099
0.083
0.083
 
WTSP
4.426
5.108
4.632
5.041
4.972
5.092
5.076
5.076
 
9.926
11.27
10.44
11.35
11.16
11.37
11.38
11.38
 
17.33
20.09
18.22
19.89
19.42
19.90
19.91
19.91
 
YWAR
0.637
0.997
0.757
0.928
0.798
0.923
0.922
0.922
 
1.273
1.992
1.581
1.979
1.671
1.988
1.998
1.998
 
1.944
3.085
2.375
3.133
2.602
3.144
3.146
3.146
 
SR
11.81
11.19
15.29
15.63
17.24
18.43
20.43
20.43
 
16.73
15.84
20.57
21.05
23.14
24.44
26.77
26.77
 
20.39
19.34
24.58
25.63
27.44
29.16
31.64
31.64
 
GN
3.898
3.635
4.588
4.668
4.903
5.282
5.731
5.731
 
4.972
4.700
5.556
5.881
5.954
6.580
7.139
7.139
 
5.611
5.437
6.222
6.848
6.722
7.628
8.306
8.306
 
SW
3.179
3.062
3.417
3.409
3.486
3.562
3.640
3.640
 
3.558
3.459
3.689
3.705
3.742
3.798
3.855
3.855
 
3.733
3.641
3.814
3.838
3.860
3.918
3.956
3.956