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week 5

by: Dani
Penn State
GPA 3.3
Population Dynamics
David Miller

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About this Document

Population Dynamics
David Miller
Class Notes
25 ?




Popular in Population Dynamics

Popular in Wildlife Studies

This 2 page Class Notes was uploaded by Dani on Sunday February 15, 2015. The Class Notes belongs to WFS 446 at Pennsylvania State University taught by David Miller in Spring2015. Since its upload, it has received 56 views. For similar materials see Population Dynamics in Wildlife Studies at Pennsylvania State University.


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Date Created: 02/15/15
2915 0 Age structured models 0 Variation in vital rates with age Survival Growth Reproduction Movement 0 Agestructure models capture this variation when making predictions 0 Survival 0 Conditional Survival of individuals from age x1 to age x o Agedependentsurvival o 3 reasons why survival might vary with age 0 What do you think mortality versus age looks like for Humans Salmon Sea turtle Deer mouse 0 What are the ways these species might differ Why should they 21115 0 Age Structured Models 0 Survival Conditional 0 Survival of individuals from age x1 to age x o Denote as Sx 0 Age specific mortality mX 1Sx Unconditional 0 Survival of individuals from age 0 to age x o Denote as lX x lx i0 Si 0 Agedependent reproduction Age at first reproduction 0 Many species do not mature in the first year 0 Reproduction is 0 until age of first reproduction Reasons for decline with age 0 Reproductive senescence Reasons for increase with age 0 Learning 0 Dominance better territory 0 Growth 0 Timing of measurements I Birthpulse models 0 Assumes reproduction for all animals occurs around the same time I Prebreeding or prebirthpulse model 0 Population sizes in each age class measured just before breeding I Postbreeding or postbirthpulse model 0 Population sizes in each age class measured just after breeding o Representingabundance I Total number of animals no longer sufficient I Need to keep track of number in each age class at each time period nxt o x age 0 t timeyear o n population size I usually to only keep track of females I Usually group all individuals greater than some age together 0 We want to predict population structure in time t1 based on the population structure in time t I If we know the agespecific survival rate we could multiply survival rate by previous age group ex age 1 to get the approximate population structure for the next year ex age 2


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