Lecture_14_Pop Dynamics_25Feb2011

Lecture_14_Pop Dynamics_25Feb2011 -...

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What conditions must be met for evolution by  natural selection  to occur? 1. Population must have variability  in alleles for traits that  influence survival and reproductive success.   2. These traits must be heritable . 3. Individuals with certain traits survive and reproduce at higher  rates than those with other traits (selective advantage ). 4. Book adds: many more individuals are born than can be  supported by the environment 
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Chapter 10  Population Dynamics Photo courtesy of Vivien Jones
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Population Dynamics Dynamics =
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Population Dynamics Dynamics =  Change    What generates population dynamics?
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Population Dynamics Dynamics =  Change    Population dynamics are generated by  the difference between increases  and decreases  in  numbers of individuals
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What processes cause populations to   increase and decrease?
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What processes cause populations to   increase and decrease? Births  and  immigration  increase  populations Death  and  emigration  decrease  populations
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Terminology Life tables = Cohort =
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Terminology Life tables =  book keeping devices that list survival  and death rates   Cohort =  a group born a the same time      (e.g.  everyone born in 1982)
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Three methods to estimate patterns of  survival: 1.  2.  3. 
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Three methods to estimate patterns of  survival: 1.  Cohort life table 2.  Static life table   3.  Age distributions
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Three methods to estimate patterns of  survival: 1. Cohort life table -   follows a single group of  individuals from birth to death and records the  number dying at each age.  This method makes relatively few assumptions, but it can be impractical  
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This note was uploaded on 04/12/2011 for the course BIO 326 taught by Professor Gehring,c during the Spring '08 term at N. Arizona.

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Lecture_14_Pop Dynamics_25Feb2011 -...

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