264 
Fishery Bulletin 113(3) 
May 
June 
July 
200 
150 
in 
100 
50 
* * 
150 
125 
100 
75 
50 
25 
0 
0 1 2 3 4 5 6 7 
150 
125 
100 
75 
50 f ] 
25 
0 
■111 
0 1 2 3 4 5 6 7 
300 
250 
200 
150 
100 
50 
0 
100 
80 
60 
40 
20 
0 
August 
Holiday 
200 
150 
100 
50 
0 
0 1 2 3 4 5 6 7 
★ 
0 1 2 3 4 5 6 7 
300 
250 
200 
150 
100 
50 
0 
01234567 01 
100 
80 
60 
, 
2 3 4 5 6 7 
Pillar 
■ 
40 
20 
0 
01234567 01234567 
150 
200 
300 
100 
125 
* 
* 250 
80 
150 
100 
200 
60 
75 
100 
150 
40 
50 
100 
25 
* 50 
50 
20 
Q 
slilb 
c 
>1 2 3 4 5 6 7 C 
>1234567 01234567 0 
150 
200 
300 
100 
Womens 
125 
100 
75 
50 
25 
0 
0 1 2 3 4 5 6 7 
150 
100 
50 
0 
HHMHB 
250 
200 
150 
100 
50 
0 
0 1 2 3 4 5 6 7 
0 12 3 
80 
60 
40 
* 20 
5 6 7 0 1 
§§gg 
2 3 4 5 6 7 
Kalsin 
11111 ®^ 
2 3 4 5 6 7 
Molt stage (C1-C6) 
Figure 9 
Frequency distribution of molt stages of southern Tanner crabs (Chionoecetes bairdi ) from each of the 4 sites around Ko- 
diak Island, Alaska, that were surveyed during May, June, July, and August 2011. An asterisk (*) indicates presumed age-1 
crabs, which were excluded from statistical analysis. Columns are months (May-August). Rows are sites (Holiday Beach, 
Pillar Creek Cove, Womens Bay, Kalsin Bay). Note that the y-axes are different among months. 
mixture of C2 and C3 instars were dominant at Pillar 
(X 2 =291.00, df=12, P<0.001). As in July, the ranking of 
sites by mean carapace width was Womens > Kalsin 
> Holiday > Pillar, and all sites differed significantly 
from each other (Kruskal-Wallis: P<0.001; multiple 
comparisons: P<0.05). Molt-stage composition varied 
with the interaction of month, depth, and study site; 
however, there was no discernible pattern, and, there- 
fore, we did not explore this interactive effect further. 
Although the relative abundance of molt stages 
largely controlled differences in mean carapace width 
among sites, for crabs at given molt stages there were 
also small but significant differences between sites. 
Considering only Cl crabs, we found that there was 
no difference in mean carapace width between sites 
(F[ 3 , 928 ] = l-34, P=0.261). However, among C2 crabs, 
mean carapace width was greater at Womens (4.93 
mm [SE 0.03]) than at Kalsin (4.82 mm [SE 0.02]) and 
Holiday (4.78 mm [SE 0.02]), where the means in turn 
were larger than the mean at Pillar (4.70 mm [SE 
0.02]); Kruskal-Wallis: P<0.001; multiple comparisons: 
P<0.05). Among C3 instars, those at Womens (7.13 mm 
[SE 0.04]) and Kalsin (6.98 mm [SE 0.03]) had greater 
mean carapace widths than those at Holiday (6.67 mm 
[SE 0.03]), where the mean in turn was larger than 
the mean at Pillar (6.55 mm [SE 0.03]); Kruskal-Wallis: 
P<0.001; multiple comparisons: P<0.05). Lastly, among 
C4 instars, those at Womens (9.77 mm [SE 0.03]) and 
Kalsin (9.82 mm [SE 0.05]) again had greater mean 
carapace widths than those at Holiday (9.51 mm [SE 
0.08]), where the mean was in turn greater than that 
at Pillar (9.08 mm [SE 0.09]); P[ 3 ; 503]=26.6, PcO.001). 
Crabs in the C5 and C6 molt stages were too few in 
number to provide meaningful comparisons. 
