Browsing by Subject "Age-structured populations"
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Item A stochastic age-structured population model(Texas Tech University, 1998-05) Chowdhury, MarufulAge-structured models for biological species have received much study. In this thesis the age-structured population model is extended to a stochastic agestructured model. The model is solved numerically for two age-structured population examples. The calculational results are compared with Monte Carlo calculations. The results indicate that the two calculational methods are in agreement. Persistence times for two age-structured populations are then studied computationally. It is shown that persistence times increase as the number of age groups increases. Also, persistence times are higher for a stohastic age-structured population than for a nonstochastic (or deterministic) age-structured population.Item Deterministic and stochastic nonlinear age-structured models(Texas Tech University, 1998-12) Block, Garry L.The Leslie age-structured population model is reviewed, as well as its stochastic analogue. Nonlinear adjustments in the form of the Ricker and Beverton-Holt densitydependent factors are made to these models. The deterministic density-dependent nonlinear models are discussed and compared to their stochastic nonlinear analogs.