9466

• UCREFRP Catalog Number: 9466
• Author: McAda, C. W.
• Title: Population Size and Structure of Humpback Chub in Black Rocks, 1998-2000.
• USFW Year: 2002.
• USFW - Doc Type: Grand Junction.
• Copyright Material: NO

TABLE A-1.-Variation in population estimates for humpback chub in Black Rocks,
1998-2000 using different models. Model Mo was the best estimator based on the
selection criteria.
95% Model
Confidence Capture Selection
Model N SE CV Intervals Probability Criterias
1998 (all fish)
Mo 948 239 0.25 603-1,573 0.0685 0.87
Darroch M, 924 230 0.25 591-1
526 ,
0.37
Chao Mt 954 255 0.27 593-1,631 0.85
Chao Mh 1,495 446 0.30 869-2,691 0.85
Chao Min 1,293 541 0.42 632-2,928 0.46
Jacknife Mh 349 19 0.05 317- 390 0.85
__ Schnabel 435 78 0.18
------ 321- 639
----

1998 (>200 mm) ------------------------ ------------
Ma 764 172 0.23 S 12-1,206 0.0839 0.92
Darroch Mt 900 225 0.25 575-1,490 0.31
Chao Mt 926 247 0.27 576-1,583 0.31
Chao Mh 1,446 431 0.30 $41-2,603 O,gg
Chao Mtn 1,248 S22 0.42 611-2,826 0.43
Jacknife Mh 343 18 0.05 311- 383 O,gg
Schnabel 431 79 0.18 317- 637
1999
Mo 921 122
Darroch Mt 956 130
Chao Mt 889 125
Chao Mh 1,118 I73
Chao Mt,, 926 130
Jacknife Mh 643 31
Schnabel 635 78
0.13 723-1,208
0.14 746-1,262
0.14 690-1,187
0.15 843-1,531
0.14 718-1,234
0.05 588- 708 0.70
0.12 513- 824
0.0896 i.00
0.58
0.58
0.70
0.76
2000
Mo 539 290 0.54 223-1,497 0.0439 1.00
Darroch Mt 447 196 0.44 213-1,052 0.00
Chao Mt 416 196 0.47 193-1,039 0.00
Chao M,, 772 443 0.57 294-2,253 0.83
Chao M,,, 536 296 0.55 218-1,528 0.37
Jacknife M,, I32 12 0.09 113- 158 0.83
Schnabel 212 80 0.38 119- 468
8 Estimates for all models except Schnabel were done with program CAPTURE, which generates the selection
criteria.
A-1