BIOL
8 Population Growth (1) (1)

# 8 Population Growth (1) (1) - Population Growth Student...

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• mdurke1
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Population Growth Student Resource Manual: Agar (pg.1), Bacteria (pg.2-7), Growth (22-23), Sterile Technique (pg. 3) Serial Dilution Instructions (Moodle)

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Population Growth Reproduction is the main feature of all living organisms Population size is a dynamic process - always changing over time Population growth rate : rate at which the number of individuals in a population increase Rate = (Population at end of period – Population at beginning of period) Population at beginning of period
Two important models of population growth based on reproduction of organisms IMPORTANCE: How long will it take for a population to grow to a specific size? What will population size be after n years (or generations)? What happens when there are limited resources ? Population growth models Exponential Growth Logistic Growth Assumptions are different

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LAG INFINITE? Exponential Growth Population size expands by ever increasing increments during successive intervals (TIME) Growth is proportional to the current population size (N) The larger the population gets, the more individuals there are to reproduce, the faster it grows LAG at small size J- shaped curve ulation/exponent.html - population-ecology-introduction-to-population-modeling
Generation Elapsed Time (mins.) Population (N) 1 0 1 2 30 2 3 60 4 4 90 8 5 120 16 6 150 32 7 180 64 8 210 128 9 240 256 10 270 512 11 300 1024 Exponential Growth of Bacteria ΔN/Δt = rN 0 Time Lag E x p o n e nti a l G row t h REMEMBER: Growth is proportional to the current population size

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Exponential Growth ΔN = change in population size Δt = change in time r = intrinsic rate of increase (difference between the birth rate and the death rate) N 0 = initial # of individuals Equation: ΔN/Δt = rN 0 Assumptions: Continuous reproduction (e.g., no seasonality) All organisms are identical (e.g., no age structure- all are able to reproduce at a given time) Environment is constant in space and time (e.g., resources are unlimited) IS THIS REAL??
Changes in Population Size Intrinsic aspects of a population: I mmigration adds individuals E migration subtracts individuals B irths add individuals D eaths subtract individuals I + B - E - D = populations size

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