25. Extinction Processes in Small Populations

25. Extinction Processes in Small Populations - Extinction...

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Unformatted text preview: Extinction Processes in Small Populations How can we avoid sending endangered species into the “Extinction Vortex”? Topics for Today • Stochastic vs deterministic factors in the extinction process • Processes that can accelerate declines in small populations (Density Dependence and Allee effects) • Population dynamics in fragmented landscapes (Metapopulations) Deterministic vs Stochastic Factors • Deterministic factors : factors that change population size in a relatively predictable manner such as habitat loss. • Stochastic factors : factors that result in less predictable changes in population size (e.g., weather, food supplies) • Why are stochastic factors important? Populations that, on average, are ”stable” will always go extinct under the influence of stochastic factors. Genetic Stochasticity • Unpredictable changes in populations due to, for example, inbreeding and inbreeding depression. Demographic Stochasticity • Unpredictable changes in populations due the random nature of sex ratios, survival, and reproductive events...
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This note was uploaded on 12/17/2011 for the course ZOO 360 taught by Professor Staff during the Fall '08 term at University of Wisconsin.

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25. Extinction Processes in Small Populations - Extinction...

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