1. Section 5-2 Limits To Growth
Chapter 5 Populations
Section 5-2
Limits To Growth

2. Cause Population Growth to DECREASE!
Limiting Factors
Cause Population Growth to DECREASE!
Competition
Predation
Parasitism & Disease
Climate Extremes
Human Disturbances

3. Density Dependent Factors:
differ with the biome/environment
Amount food
Disease
Competition
Parasites
Versus Independent:
Abiotic factors
Habitat disruption

4. Density-Dependent Factors
Are Limiting Factors that depend on increased population size (density) for activation.
competition predation
parasitism disease

5. Between different species is a major force behind evolutionary change
Competition
Between different species is a major force behind evolutionary change
Results in the formation of NICHES

6. Competition

7. Predation Predator/Prey Relationship Balances, Stabilizes Populations
Wolves & Moose
50 kg Wolf needs 2700 kg Moose per year
Average Moose is 385 kg
How many Moose need to be eaten each year?

8. Predation 2700/385 = 7.01 Moose per Year
A pack of 8 wolves will kill how many Moose per year?

10. Makes Host Susceptible To Predation
Parasitism & Disease
Weaken Host
Makes Host Susceptible To Predation
May Kill Host.

11. Density-Independent Factors
Affect population regardless of size.
Unusual Weather
Natural Disasters
Seasonal Cycles
Human Activities
Dams
Clear Cutting

12. Density-Independent Factors
Result in crash in population size
May result in extinction

13. What sort of limiting factor is seen here?

14. Density dependent!

15. What sort of limiting factor is seen here?

16. Density independent