Density dependence

Question 1

Implications of logistic model

Answer 1

• birth rate
• death rate
• immigration rate
• change in population density

Question 2

birth rate and death rate at higher density?

Answer 2

• lower birth rate
• higher death rate

Question 3

Equilibrium density =

Answer 3

Carrying capacity (K)

Question 4

Low densities =

Answer 4

Higher birth rate than death

Question 5

High densities =

Answer 5

Higher death rate than birth (pop declines)

Question 6

Equilibrium density means what

Answer 6

Where the line crosses and birth and death rates are equal so pop shouldn’t grow or decline

Question 7

Intra-specific competition for resources leads to…

Answer 7

higher pop density, fewer resources, higher mortality rate

Question 8

Intra- specific competition comes in 2 forms:

Answer 8

1. Contest
2. Scramble

Question 9

Contest =

Answer 9

some individuals hog all resources and do well
leads to stable equilibrium

Question 10

Scramble =

Answer 10

All individuals race to get what they can
Most do well or most end up with insufficient resources
Leads to fluctuating populations

Question 11

Disease transmission

Answer 11

High density - more contacts - higher transmission