BSC 2011 Lecture 5: 5 Populations 2
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Department
Biology - Biological Sciences
Course
BSC 2011
Professor
Jennie Demarco
Semester
Spring

Description
5 Populations 2 Wednesday, March 29, 201710:38 AM Population changes over time • Emigration • Immigration • Births • Death Population growth models • Birth death • BS model ○ Changes in population size depends on the # of births and deaths over a given time • Population size = ○ #current individuals(N)+ #births (B)-#deaths (D) Population growth rate • How fast population is changing • (B-D)/1= B-D Estimating changes in population size: • Per capita=per individual • b ○ Per capita birth rate § Number of offspring a average individual produces • d ○ Per capital death • r= b-d ○ Per capita growth rate § Number of offspring a average individual produces • d ○ Per capital death • r= b-d ○ Per capita growth rate § Average individuals contribution to total population growth rate ○ Change N/ change T = rNt Where does r come from? • Timetable of individuals organisms life • Life span • Age at maturity • Parity ○ Number of reproductive events • Fecundity ○ Number f offspring per event • Time table ○ Modified by environment Life history • Schedule of an organisms growth development reproduction and survival • Parental investment ○ Amount of time and energy given to an offspring by its parent • Longevity ○ Life expectancy ○ Life span of organism Availability of resources and physical conditions shape life histories • Individual organisms require resources and physical conditions they can tolerate • Rate at which organism can quire resources increases with the availability of the resources • Resource • Conditions Principle of allocation of the resources • Resource • Conditions Principle of allocation • Once an organism has acquired a unit of some resource, it can be used for only one function at a time • Functions: ○ Maintenance ○ Foraging ○ Growth ○ Defense ○ Reproduction Populations change over time • Estimating future population size • N(t+1)= Nt+ rNt • Births= • Deaths= • If b>d r>0 ○ Population grows • B=d, r=0 ○ Population size doesn’t change Population growth • Growth rate ○ Number of new individuals produce in a given amount of time minus the number of individual that die § Births-deaths ○ Intrinsic growth rate ( r) § Highest possible per capita g
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