Biol 201 - Notes - 3.25.09

Biol 201 - Notes - 3.25.09 - Population ecology Population:...

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Population ecology Population : all individuals of a given species in a prescribed area Components of population growth: Nnow = Nthen + B – D + I – E B = births D = deaths  I = immigration E = emigration Metapopulation: a group of populations linked by dispersal Survivorship : Survivorship curves: graphically describe how a given population decreases as it ages Type I curve: stays high until old age, then drops off very quickly Type II: die at equal rates regardless of age Type III: die at high rate as juveniles then at lowers rates in old age Static life table:  Ends up as a type I curve here, though there is a bit of infant mortality Fecundity / fertility schedule: birth rates vry with age Mx = avg number of offspring produced by an individual of age x Ix = fraction of population surviving to each age IxMx = avg number of offspring produced per individual during age
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This note was uploaded on 09/24/2009 for the course BIOL 201 taught by Professor Mitchell during the Spring '07 term at UNC.

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Biol 201 - Notes - 3.25.09 - Population ecology Population:...

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