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
|
||