Age-Structured Model

Age-Structured Model

Demographics A mathematical model which divides a population into different age classes in order to evaluate the effects of age-dependent infection, morbidity or mortality rates or age-specific vaccination schedules, and other factors.
Epidemiology A mathematical model that stratifies a study population into different age classes. See Population.
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ABSTRACT Exploitation rates for the Pacific geoduck commercial fishery in British Columbia are currently based on an age-structured model using geoduck age data derived from the ring-counting method.
Using the age-structured model, we back-calculated historical recruitment patterns and compared how the aging methods affected trends in recruitment over time.
We investigated the effectiveness of this measure by using a dynamic age-structured model.
Historic recruitment patterns were back calculated using an age-structured model.
We back-calculated historic recruitment patterns using an age-structured model, and simulated future recruitment from the estimated historic recruitment pattern.
A simple age-structured model (Appendix I) was set up to simulate a population for 20 years, starting from an unexploited population and generating catch, effort, and catch-at-age data.
The value of M estimated by the age-structure model was likely to be more accurate than estimated by the method of catch curve analysis of age frequency distributions, because the age-structured model takes into account the temporal variations in recruitment and young geoduck not fully vulnerable to fishing.
To derive h priors by using age-structured models would require some age-specific parameters, such as fecundity, growth, and possibly age-specific natural mortality rates.