growth models what are the assumptions for an exponential growth model? is this realistic?
TRANSCRIPT
Population Ecology
GROWTH MODELSBIDE modelChange in population size over a specific time period
Births + Immigration – Death – Emigration = pop size
Exponential growth
GROWTH MODELS
GROWTH MODELS
What are the assumptions for an exponential growth model?Is this realistic?
GROWTH MODELS
There is a limit to the number of organisms a habitat can support.
Carrying capacity (K)Logistic growth
LOGISTIC GROWTH PRACTICE
Starting population size of 10
= 1.0 (per individual per year)
Carrying capacity = 1,500
Record data for 12 years.
Create a line graph showing the population growth.
GROWTH MODELS
Logistic growth in the real world…
GROWTH MODELS
LIMITING FACTORS
Density dependent
When factors directly affect birth and
death rates.
LIMITING FACTORSDensity dependent prey/predator relationship
DISPERSIONInfluences growth of populations
Influenced by limiting factors (especially density-dependent)
DISPERSION
AGE STRUCTURES
AGE STRUCTURES http://
www.prb.org/Multimedia/Video/2013/population-structure-engage-short.aspx
http://grist.org/population/2011-09-25-7-billion-in-7-minutes-science-magazine-explains-it-all-video/