2.2 Flashcards
What 2 factors have a positive effect on population growth?
Births and immigration
What 2 factors have a negative effect on population growth?
deaths and emigration
What does N represent?
population size scale
What does N⁰ represent?
Initial population size
What does r represent?
maximum per capita growth rate
What does t represent?
time
What does k represent?
carrying capacity
What does dn/dt represent?
change in N relative to change in t
What is exponential growth?
population growth increases as population size increases ( steady incline)
What is logistic growth?
Growth rate decreases once population reaches carrying capacity.
What does density dependent mean?
effect is dependent on the density of the population
What does density independent mean?
effect is not related to/is independent of the density of the population
What happens when you increase/decrease r?
If you increase r, the population will grow faster and steeper. The opposite is true for a decrease in r.
What is the formula for calculating r?
growth/individuals
births-deaths/N⁰
N⁰-original size of the population
How do you find dN/dt?
rN- r=per capita rate of growth
N=population size
