854 
Fishery Bulletin 96(4), 1 998 
Table 5 
Estimated stock composition of five 200-fish mixtures of coho salmon from several regions in British Columbia using a 34-stock 
baseline. Each mixture was generated 50 times, and stock composition of the mixture was estimated by randomly resampling 
each baseline population, with replacement, to derive a new estimation of the fish mixture composition. The mean and standard 
deviations of 50 estimations are reported for each population. Individual population estimates are followed by the sum of contri- 
butions from a region (bold type). 
Mix 1 
Mix 2 
Mix 3 
Mix 4 
Mix 5 
True 
Mean 
SD 
True 
Mean 
SD 
True 
Mean 
SD 
True 
Mean 
SD 
True 
Mean 
SD 
Pallant 
0 
0.02 
0.02 
0 
0.01 
0.01 
0 
0.00 
0.01 
0 
0.00 
0.01 
0 
0.01 
0.01 
Atnarko 
0 
0.01 
0.01 
0.13 
0.11 
0.02 
0 
0.00 
0.01 
0 
0.02 
0.02 
0 
0.02 
0.02 
Kitimat 
0 
0.01 
0.02 
0.13 
0.10 
0.02 
0 
0.01 
0.01 
0 
0.02 
0.02 
0.20 
0.16 
0.04 
C Coast 
0 
0.02 
0.02 
0.26 
0.21 
0.03 
0 
0.01 
0.01 
0 
0.04 
0.03 
0.20 
0.18 
0.04 
Cluxewe 
0 
0.01 
0.01 
0 
0.01 
0.01 
0 
0.00 
0.01 
0 
0.00 
0.01 
0 
0.01 
0.01 
Stephens 
0.13 
0.10 
0.02 
0 
0.00 
0.00 
0 
0.01 
0.01 
0 
0.01 
0.01 
0 
0.01 
0.02 
Waukwaas 
0.17 
0.12 
0.03 
0 
0.00 
0.00 
0 
0.01 
0.01 
0 
0.00 
0.01 
0 
0.00 
0.01 
NCVI 
0.30 
0.23 
0.03 
0 
0.01 
0.01 
0 
0.02 
0.02 
0 
0.01 
0.01 
0 
0.02 
0.02 
Nitinat 
0.13 
0.10 
0.02 
0 
0.00 
0.00 
0 
0.00 
0.01 
0 
0.00 
0.00 
0 
0.00 
0.00 
Robertson 
0.13 
0.12 
0.03 
0 
0.00 
0.00 
0.15 
0.13 
0.01 
0 
0.00 
0.01 
0 
0.00 
0.00 
WCVI 
0.26 
0.22 
0.03 
0 
0.00 
0.01 
0.15 
0.13 
0.01 
0 
0.00 
0.01 
0 
0.00 
0.01 
Quinsam 
0.17 
0.15 
0.05 
0 
0.02 
0.03 
0 
0.01 
0.01 
0 
0.01 
0.01 
0 
0.03 
0.04 
Big Qualic 
0.26 
0.22 
0.04 
0.17 
0.14 
0.03 
0 
0.01 
0.02 
0 
0.01 
0.01 
0.25 
0.19 
0.04 
ECVI 
0.43 
0.37 
0.06 
0.17 
0.16 
0.04 
0 
0.02 
0.02 
0 
0.02 
0.02 
0.25 
0.22 
0.05 
Toboggan 
0 
0.00 
0.00 
0.26 
0.24 
0.03 
0 
0.00 
0.00 
0.14 
0.15 
0.03 
0 
0.01 
0.01 
Cedar 
0 
0.01 
0.01 
0 
0.01 
0.01 
0 
0.00 
0.01 
0.13 
0.09 
0.03 
0.20 
0.13 
0.03 
Babine 
0 
0.00 
0.01 
0.17 
0.16 
0.02 
0 
0.00 
0.00 
0.26 
0.25 
0.04 
0 
0.00 
0.00 
Clearwater 
0 
0.00 
0.01 
0 
0.00 
0.01 
0 
0.00 
0.00 
0.17 
0.14 
0.03 
0 
0.01 
0.01 
Sustut 
0 
0.00 
0.00 
0 
0.01 
0.01 
0 
0.00 
0.00 
0.13 
0.10 
0.03 
0 
0.00 
0.01 
Skeena 
0 
0.01 
0.02 
0.43 
0.42 
0.03 
0 
0.00 
0.00 
0.83 
0.73 
0.04 
0.20 
0.15 
0.03 
Tseax 
0 
0.01 
0.01 
0 
0.00 
0.01 
0 
0.01 
0.01 
0 
0.01 
0.01 
0 
0.01 
0.01 
Zolzap 
0 
0.00 
0.01 
0 
0.01 
0.01 
0 
0.00 
0.01 
0 
0.01 
0.01 
0 
0.01 
0.01 
Meziadin 
0 
0.01 
0.01 
0 
0.01 
0.01 
0 
0.00 
0.00 
0.17 
0.13 
0.03 
0 
0.01 
0.01 
Nass 
0 
0.02 
0.03 
0 
0.02 
0.02 
0 
0.01 
0.00 
0.17 
0.15 
0.03 
0 
0.03 
0.02 
Coldwater 
0 
0.00 
0.00 
0 
0.00 
0.00 
0 
0.03 
0.02 
0 
0.00 
0.00 
0 
0.00 
0.00 
Salmon 
0 
0.00 
0.00 
0 
0.00 
0.00 
0 
0.00 
0.01 
0 
0.00 
0.00 
0.10 
0.09 
0.01 
Eagle 
0 
0.00 
0.00 
0 
0.00 
0.00 
0 
0.01 
0.01 
0 
0.00 
0.00 
0 
0.00 
0.00 
Spius 
0 
0.00 
0.00 
0 
0.00 
0.00 
0.20 
0.16 
0.03 
0 
0.00 
0.00 
0 
0.00 
0.00 
Lemieux 
0 
0.00 
0.00 
0 
0.00 
0.00 
0 
0.00 
0.01 
0 
0.00 
0.00 
0 
0.00 
0.00 
Dunn 
0 
0.00 
0.00 
0 
0.00 
0.00 
0 
0.00 
0.00 
0 
0.00 
0.00 
0 
0.00 
0.00 
Louis 
0 
0.01 
0.01 
0 
0.00 
0.00 
0 
0.01 
0.01 
0 
0.00 
0.00 
0 
0.00 
0.00 
Deadman 
0 
0.01 
0.01 
0 
0.00 
0.00 
0 
0.00 
0.00 
0 
0.00 
0.00 
0 
0.01 
0.00 
Bridge 
0 
0.00 
0.00 
0 
0.00 
0.00 
0 
0.00 
0.00 
0 
0.00 
0.00 
0 
0.00 
0.00 
TR 
0 
0.02 
0.01 
0 
0.01 
0.01 
0.20 
0.21 
0.01 
0 
0.01 
0.01 
0.10 
0.10 
0.01 
Chilliwack 
0 
0.04 
0.03 
0 
0.01 
0.01 
0.10 
0.10 
0.04 
0 
0.00 
0.01 
0 
0.02 
0.03 
Chehalis 
0 
0.01 
0.02 
0 
0.01 
0.02 
0.25 
0.18 
0.03 
0 
0.01 
0.01 
0 
0.02 
0.03 
Stave 
0 
0.01 
0.02 
0 
0.02 
0.02 
0 
0.02 
0.02 
0 
0.01 
0.02 
0 
0.03 
0.03 
Upper Pitt 
0 
0.01 
0.01 
0 
0.01 
0.01 
0 
0.01 
0.02 
0 
0.00 
0.01 
0.10 
0.08 
0.04 
Nicomen 
0 
0.01 
0.02 
0 
0.01 
0.01 
0.10 
0.10 
0.03 
0 
0.00 
0.01 
0 
0.01 
0.02 
Norrish 
0 
0.01 
0.02 
0 
0.01 
0.02 
0 
0.02 
0.02 
0 
0.01 
0.02 
0 
0.03 
0.03 
Inch 
0 
0.01 
0.01 
0.13 
0.09 
0.03 
0.20 
0.17 
0.03 
0 
0.00 
0.01 
0.15 
0.11 
0.03 
L Fr 
0 
0.10 
0.04 
0.13 
0.16 
0.03 
0.65 
0.60 
0.03 
0 
0.04 
0.03 
0.25 
0.30 
0.05 
of our study on the basis of only three microsatellite 
loci, albeit ones selected for high levels of intra- and 
interpopulation polymorphism. The four major re- 
gional components of diversity in B.C. coho salmon 
almost certainly constitute the phylogeographic 
legacy of the last ice age, which ended 10-15,000 
years ago. When the headwaters of the neighboring 
Columbia River system were in contact with the up- 
per reaches of the Thompson-Fraser watershed, Co- 
lumbia River coho salmon recolonized the Thomp- 
son and upper Fraser River (McPhail and Lindsey, 
1986; Wehrhahn and Powell, 1987; Small et al., 
1998). Coho salmon from the northern Bering Sea- 
Yukon River glacial refuge dispersed southward by 
