Table 2. Within-site temporal variance estimates (τ12), expressed as coefficients of variation. 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. Target codes are as in Fig. 2. Variance estimates are derived from data collected near Calling Lake, Alberta, Canada from 1993 to 1998.

Target species
No. surveys, four stations
  
No. surveys, nine stations
  
No. surveys, 16 stations

 

 

 
1
2
3
4
  
1
2
3
4
  
1
2
3
4
BCCH
2.389
2.327
2.274
2.188
2.020
2.003
1.903
1.903
  
2.185
2.120
1.922
1.834
1.732
1.657
1.570
1.570
  
2.035
1.887
1.740
1.610
1.455
1.385
1.264
1.264
 
BGNW
1.219
1.073
0.806
0.809
0.734
0.680
0.615
0.615
  
0.773
0.718
0.544
0.514
0.470
0.442
0.407
0.407
  
0.605
0.562
0.442
0.427
0.367
0.381
0.348
0.348
 
BHCO
1.978
2.096
1.747
1.887
1.689
1.730
1.629
1.629
  
1.659
1.839
1.464
1.516
1.448
1.349
1.229
1.229
  
1.422
1.578
1.399
1.314
1.331
1.102
0.925
0.925
 
GRJA
1.849
2.391
1.849
2.320
1.849
2.284
2.326
2.326
  
1.849
2.387
1.849
2.269
1.849
2.257
2.256
2.256
  
1.549
2.296
1.549
1.937
1.549
1.830
1.848
1.848
 
PIWO
2.449
2.406
2.449
2.322
2.449
2.260
2.064
2.064
  
2.449
2.410
2.449
2.269
2.449
2.131
1.857
1.857
  
2.449
2.256
2.449
1.977
2.449
1.607
1.314
1.314
 
WBNU
2.449
2.449
2.449
2.449
2.499
2.449
1.999
1.999
  
2.449
2.387
2.449
2.314
1.999
2.299
2.224
2.224
  
2.449
2.366
2.449
2.202
1.549
2.127
1.999
1.999
 
WTSP
0.671
0.615
0.468
0.460
0.406
0.391
0.357
0.357
  
0.573
0.513
0.383
0.383
0.353
0.340
0.313
0.313
  
0.484
0.439
0.350
0.346
0.327
0.304
0.276
0.276
 
YWAR
1.801
1.525
1.358
1.250
1.158
1.096
0.991
0.991
  
1.462
1.277
1.087
1.041
1.036
0.890
0.795
0.795
  
1.218
1.138
0.964
0.894
0.990
0.768
0.688
0.688
 
SR
0.206
0.234
0.153
0.162
0.143
0.139
0.122
0.122
  
0.141
0.200
0.100
0.139
0.099
0.111
0.105
0.105
  
0.117
0.186
0.089
0.123
0.092
0.099
0.086
0.086
 
GN
0.329
0.321
0.231
0.249
0.230
0.216
0.185
0.185
  
0.247
0.279
0.168
0.209
0.183
0.172
0.160
0.160
  
0.247
0.232
0.158
0.201
0.164
0.162
0.124
0.124
 
SW
0.100
0.129
0.069
0.077
0.057
0.057
0.046
0.046
  
0.062
0.080
0.044
0.054
0.035
0.043
0.033
0.033
  
0.047
0.069
0.029
0.046
0.023
0.033
0.026
0.026