Spatial06

Spatial06 - Demographic PVA in a nutshell Create life-cycle...

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Demographic PVA in a nutshell Create life-cycle graph Convert it to a transition matrix Estimate parameters for year-specific (if available) and average matrices For average matrix: Calculate λ 1 Calculate CI of λ 1 Calculate sensitivities of λ 1 to vital rates If multiple years of data: Calculate log λ S Use simulations to estimate extinction risk Use sensitivity analysis of λ 1 to guide explorations of the effects of changing various vital rates on extinction risk If population is small: Create models with demographic stochasticity (with or without ES)
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If you find yourself doing a lot of demographic analysis… Learn Matlab or R Get Hal Caswell’s book: Caswell, H. 2001. Matrix Population Models: Construction, Analysis, and Interpretation. Sinauer Press, 722 pp.
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Terminology for spatial PVA Site: discrete patch of habitat that has some potential to maintain the species Local Population: group of individuals living at a site Global (Multi-Site) Population: individuals living at all sites Metapopulation: multi-site population characterized by frequent local extinction and recolonization
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Endpoints Probability of global extinction Importance of given population for global persistence Value of increasing or maintaining dispersal between sites (e.g. through corridors)
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Scenarios Independent populations Mainland-island One highly viable site Other sites depend on immigration from “mainland” site Archipelago All sites with moderate viability, some dispersal Metapopulation Local extinction frequent Recolonization by dispersers frequent
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This note was uploaded on 08/06/2008 for the course ESM 211 taught by Professor Kendall during the Winter '08 term at UCSB.

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Spatial06 - Demographic PVA in a nutshell Create life-cycle...

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