Population Ecology II 2011

Population Ecology II 2011 - Outline Mortality- life tables...

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Unformatted text preview: Outline Mortality- life tables and survivorship curves Natality- fecundity schedule and natality curves How do we use this information? Conservation Mortality The Mechanics of a Life Table Cohort Life Table Start with 1000 individuals, all the same age (just born), and then follow them until they all die. Conditions: 1. Must be able to distinguish these 1000 individuals from all others through time. 2. Must be able to count all of these individuals once every year. 3. No individuals leave the cohort except through death (no emigration). Our ultimate goal is to understand how the probability of death is related to age. q = probability of dying, or age-speciFc mortality = probability of dying, or age-speciFc mortality rate. rate. 0.747 747 5 0.167 150 0.897 897 4 0.0 0.897 897 3 0.021 19 0.916 916 2 0.084 84 1.00 1000 1 q x d x l x N x x Example: q 2 = 19/916 = 0.021 Who CARES?!...
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Population Ecology II 2011 - Outline Mortality- life tables...

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