He et at: Interactions of age-dependent mortality and selectivity functions in age-based stock assessment models 
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Figure 9 
True selectivity from simulation models and estimated selectivity from stock syn- 
thesis assessment models (run 9 to run 16). The run number is shown in the 
upper left of each graph. Solid lines are true selectivity and thick dashed lines are 
median selectivity from assessment models. Thin dashed lines are 2.5% and 97.5% 
quantiles from assessment outputs. Specifications for each panel are: M = constant 
M and MJO=high M in juvenile and old fish; L/L=logistic selectivity in both simu- 
lation and assessment models; D/D = double normal selectivity in both simulation 
and assessment models; D/L = double normal selectivity in simulation model, but 
logistic selectivity in assessment model; and L/D=logistic selectivity in simulation 
model, but double normal selectivity in assessment model. 
16), the results varied. For runs 13 and 15, in which 
a single natural mortality was used for all ages and 
was estimated in the assessment models, key assess- 
ment outputs, including spawning outputs, selectivity, 
and distributions of estimated h values, were very 
similar to runs 9 and 11 (Tables 3 and 4; Figs. 8-10). 
Estimated values of natural mortality (M) were also 
very close to the true underlying M values (Table 5). 
