2.2 Population Growth

Question 1

What is the difference between exponential and logistical growth?

Answer 1

Exponential is in an ideal environment and grows without limiting factors, logistical is the opposite and is limited due to various factors.

Question 2

Where is growth rate the highest on exponential and logistical growth?

Answer 2

At 1/2K (or half the carrying capacity)

Question 2

What is the difference between variables N and N0?

Answer 2

N is the current population size, and N0 is the original population size.

Question 3

What does r, K, and dN/dT mean?

Answer 3

r= per capita
K= carrying capacity
dN/dT= population growth rate (number change/ time change)

Question 4

What are 4 factors that can change a population size?

Answer 4

Positive- birth & immigration
Negative- death & emigration

Question 5

What happens when r is increased/decreased on a growth model?

Answer 5

Increased- the slope is faster (ex 1/2)
decreased- the slope is slower (ex 1/8)

Question 6

What happens when K is increased/decreased on a logistical growth model?

Answer 6

Increased- There can be a higher population, making the slope longer
Decreased- There needs to be a smaller population so it reaches the highest growth point faster

Question 7

What happens when N is increased/decreases on a growth model?

Answer 7

Increased- on a logistical it hits carrying capacity faster, on exponential it grows faster this is because it starts with more to reproduce with
Decreased- on a logistical is grows slower and hits carrying capacity slower, on exponential it grows slower and this is because it starts with a few reproducing