Biology Essentials- Logistic Growth (S-shaped curve)
1: What is N?
N is the population size.
2: What is r? What is the equation for r?
r is growth rate.
r=(births-deaths)/N
3: What did Darwin realize about elephants and their reproductive rate?
Darwin realized that if you let elephants keep breeding from 30 years old to 90 years old, they reproduce to have 3 pairs of young. By the time they end their reproduction, the elephants will have 15 million elephants descended from first pair.
4: What is K?
K is carrying capacity.
5: What is the equation for exponential growth (j shaped curve)?
The equation for exponential growth is dN/dt=r N.
6: For logistic growth, what changes from exponential growth?
(K-N)/K is added to the exponential growth equation.
7: What happens if r is bigger than 0?
If r is bigger than 0 then it will show exponential growth.
8: What is an r selected species?
Species that loves to grow as quickly as it can.
9: What is a K selected species? Give an example.
Growth rate of these species is slow and the offspring are cared for.
10: What kind of selected species are humans?
Humans are a K selected species because we care for our children.
1: What is N?
N is the population size.
2: What is r? What is the equation for r?
r is growth rate.
r=(births-deaths)/N
3: What did Darwin realize about elephants and their reproductive rate?
Darwin realized that if you let elephants keep breeding from 30 years old to 90 years old, they reproduce to have 3 pairs of young. By the time they end their reproduction, the elephants will have 15 million elephants descended from first pair.
4: What is K?
K is carrying capacity.
5: What is the equation for exponential growth (j shaped curve)?
The equation for exponential growth is dN/dt=r N.
6: For logistic growth, what changes from exponential growth?
(K-N)/K is added to the exponential growth equation.
7: What happens if r is bigger than 0?
If r is bigger than 0 then it will show exponential growth.
8: What is an r selected species?
Species that loves to grow as quickly as it can.
9: What is a K selected species? Give an example.
Growth rate of these species is slow and the offspring are cared for.
10: What kind of selected species are humans?
Humans are a K selected species because we care for our children.