Lecture sixteen Flashcards
What does the geometric model assume?
Discrete breeding
What are population growth models used for?
To estimate population size many generations into the future
What is the typical pattern of growth for the geometric model?
Population size in the future (Nt) will depend on the growth rate of the population and the size sometime in the past (N0)
What does the exponential model assume?
Continuous breeding
What is “r”?
Exponential growth rate
Why are the 5 underlying assumptions of the exponential model?
All individuals have same b and d rates B and d are constant through time B and d occur continuously No migration (population closed) Resources are unlimited
What is r equal to?
Average birth rate - average death rate
Is r constant or variable?
Constant
When is exponential population growth normally observed?
When population size is low
When is r=0?
When ppo size is high, competition increases, resources limited
Why is exponential growth not typically observed?
Because underlying assumptions are violated
