2.2 Flashcards
What are the two methods of population increase?
Immigration and births
What are two methods of population decrease?
Emigration and death
What is the difference between exponential and logistic growth?
Exponential growth keeps going forever; logistic growth levels off a carrying capacity.
What does the variable ‘N’ stand for?
The population size at the current time.
What does ‘N0’ stand for?
The initial population size
What does ‘r’ stand for?
The maximum per Capita growth rate
What does ‘K’ stand for?
The carrying capacity
What does ‘dN/dt’ stand for?
The population growth rate
Are density-dependent factors usually biotic or abiotic?
Biotic
Are density-independent factors usually biotic or abiotic?
Abiotic
What is a density-dependent factor?
A limiting factor that changes depending on the population density.
What is a density-independent factor?
A limiting factor that does not change depending on the population density.
If ‘r’ increases, how would an exponential growth model change, and why?
In a graph of population size over time that uses the linear growth model, the slope would increase because the amount of offspring per each animal would be increasing.
