9.2 Pop Eco

Question 1

How does death, birth, immigration, and emigration affect pop size?

Answer 1

Increase: birth and immigration
Decrease: death and emigration

Question 2

What is the difference between an exponential graph and a logistic graph?

Answer 2

Exponential: larger the population, larger it grows, happens in ideal conditions with few limiting factors
Logistic: pop growth is slow in beginning and when pop nears carrying capacity

Question 3

What does the variables N, N0, r, t, K, dN/dt stand for in the growth models?

Answer 3

N= pop size
N0= initial pop size
r= max per capita growth rate
t= time
K= carrying capacity
dN/dt= pop growth rate

Question 4

What is the definition of density-dependent?

Answer 4

Effect is dependent on the density of the pop

Question 5

What is an example of density-dependent?

Answer 5

Disease, competition, predation

Question 6

What is the definition of density-independent?

Answer 6

Effect is not related to the pop

Question 7

What is an example of density-independent?

Answer 7

Climate, natural resources, pollution

Question 8

How does exponential and logistic growth models change when r, N, or K change and why?