Warm up 3/19Draw and label the graph for the Logistic

model.Show the exponential sectionShow the carrying capacityExplain how the carrying capacity is related

to density dependent and density independent factors.

19.3: Human Population Growth

By the end of this class 20,000 babies will have been born.

What has caused this rapid growth?

How long can this continue?

History of Human PopulationHunter-gatherer Lifestyle (500,000 years ago to 12,000 years ago)

History of Human PopulationHunter-gatherer Lifestyle (500,000 years ago to 12,000 years ago)Small nomadic groupsSlow growth rate

History of Human PopulationThe population explosion

Grew due to decline in deathIncreased sanitation and hygiene

Increased food supply and economics

Population Growth Today

20% of world’s population lives in developed countries (modern, industrialized)Growth rate is very low (.003 per capita)

80% of population live in developing countries High growth rate (.015 per capita)

Demographic TransitionModel showing how population can

stop growingStage I: birth and death rate at high levels and population size is stable

Demographic TransitionStage 2: population explosion occurs. Death rates decline as hygiene, nutrition, and education increase, but birth rates remain high.

Demographic TransitionStage 3: Birth rates decrease coming close to death rates which stabilizes population size.

Demographic TransitionStage 4: birth rate drops below death rate so population size decreases.

HomeworkDue Friday

Lab

Quiz- Friday (Tomorrow) Ecology – Energy Flow

Exam Wednesday 3/26. This math will be on the Test! You may use a calculator but

not your cell phone.So Bring a CALCULATOR

Intervention Monday Afternoon and Tuesday Morning.

HomeworkDue Wednesday

Read P 371- 374P 374 #1-5

Due Thursday Read p 383 – 387 P 389 Problems # 1-5 This math will be on the Test! You may use a calculator but

not your cell phone.So Bring a CALCULATOR

Exam Wednesday 3/26. Intervention Monday Afternoon and Tuesday Morning.

Class WorkEcology Vocab #2

Study Guide

Homework