Population Size

Competition Parasitism & Disease

Predation

Extreme Climate

Human Disturbance

Limits to Growth

Limiting FactorsSomething that causes population growth

to decrease

• Competition• Predation• Extreme Climate• Parasitism & Disease• Human Disturbance

Pandas eat bambooBamboo forests are being

destroyed by humansPanda populations are

decreasing

What type of limiting factor is this?

Gray wolves feed on deerHuman hunters begin

hunting deer in the gray wolf range

The gray wolf population decreases due to lack of food

What type of limiting factor is this?

Density-Dependent FactorsA limiting factor that depends on

population size (has more of an affect the bigger the population)

• Competition• Predation• Parasitism/Disease

Why do these affect larger populations?

Density-Independent FactorsFactors that affect a population, no

matter the size

• Human Disturbances• Extreme Weather

Human Population Growth

Turn to p129 in bookFig 5-10

Why does the population increase exponentially in the 1800’s?

What is missing from this graph?

Read p128 in Textbook:Does the Gray Wolf Population Need

Protection?

Read 2 more handouts on the issue

Answer Research & Decide #1 & 2 on p128 in spiral