L12 ch 56

# L12 ch 56 - Lecture 12 Chapter 56 Lecture Guide Population...

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Lecture 12: Chapter 56 Lecture Guide Population Ecology-II Population Dynamics Interaction of factors associated with demography and population growth Population Cycles Life Tables Summarizes the probability that an individual will survive and reproduce in any given year over the course of its lifetime Number alive (n x ): number of individuals alive at the start of a time period. Number dying (d x ): number of individuals that die from one year to the next. Survivorship (l x ) : individuals surviving to a specific age (age x) l x = n x /n o Life Tables Reproduction Rate ( Age-Specific Fertility ) ( m x ): Number of female offspring born to a mother of age x Contribution of each age class to the overall population growth rate ( l x m x ) Net reproductive rate (R 0 ) : sum of l x m x R 0 >1; growth R 0 <1; decline R 0 =1; equilibrium Age class-a group of individuals of a specific age Cohort-all individuals of the same age Survivorship Curve for N. American Beaver

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L12 ch 56 - Lecture 12 Chapter 56 Lecture Guide Population...

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