BIOL 3130 Lecture : Conservation Biology - 10. PVAs
23 Mar 2012
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Document Summary
Small populations can go extinct even if the expected (b-d) > 0, there is safety in numbers. Quantitative methods are needed to assess viability of threatened and endangered populations in these plans. Population viability analysis is a set of tools for quantifying the current and future status of populations of conservation interest. Used to understand the persistence of populations over time. Requires long-term data sets and an in-depth understanding of the species" biology: dormancy, survival rates, seed bank dynamics, reproductive rates, age of reproductive maturity, impacts of stochastic events, mortality. Synthesis of knowledge about a species, its environment, and human actions in a model of population dynamics. Like most demographic analyses, pvas focus on key birth and death processes. Simpler models ignore immigration and emigration (although more complicated ones can include multiple populations with migration) Survival refers to remaining in an stage class (age class) Growth refers to going from one stage class (age class) to another.
