PCB 3044 Chapter 10 - Chapter 10 Population Dynamics...

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Chapter 10: Population Dynamics Patterns of Population Growth Delayed Density Dependence Population Extinction Metapopulations Introduction Populations can change in size as a result of four processes: Birth, death, immigration, and emigration. N sub t+1 = (N sub t) + B – D + I – E o N sub t=Population size at time t o Number of births o Number of Deaths o Number of immigrants o Number of emigrants Patterns of Population Growth Concept 10.1: Populations exhibit a wide range of growth patterns, including exponential growth, logistic growth, fluctuations, and regular cycles. Delayed density dependence: Delays in the effect that density has on population size. Delayed density dependence can contribute to population fluctuations. The logistic equation can be modified to include time lags: o dN/dt=rn [1- N(t-t)/K] o N sub t-t= population size at time t-t Population Extinction Concept 10.3: The risk of extinction increases greatly in small populations. Genetic Drift:
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PCB 3044 Chapter 10 - Chapter 10 Population Dynamics...

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