Updated Jan. 2005Created by C. Ippolito January, 2005 Chapter 5 Populations Pages

Updated Jan. 2005Created by C. Ippolito January, 2005 Chapter 5 Section 1 How Populations Grow What characteristics are used to describe a population? What factors affect population size? What are exponential and logistical growth? 2

Updated Jan. 2005Created by C. Ippolito January, 2005 Objectives 1.List the characteristics used to describe a population. 2.Identify the factors that affect population size. 3.Differentiate between exponential and logistic growth. 3

Updated Jan. 2005Created by C. Ippolito January, 2005 Characteristics of Population  Geographic Distribution (range) Is the area inhabited by a population  Population Density Is the number of individuals per unit area  Growth Rate Is how quickly a population increases its numbers  Age Structure How many individuals of different ages make up the population 4

Updated Jan. 2005Created by C. Ippolito January, 2005 Factors Affecting Population Growth  Birth Rate Populations grow when births outnumber deaths  Death Rate Populations shrink when deaths outnumber births  Immigration Individuals enter into population  Emigrations Individuals leave a population 5

Updated Jan. 2005Created by C. Ippolito January, 2005 Exponential Growth  Ideal conditions with unlimited resources. Individuals reproduce at a constant rate J-shaped graph 6

Updated Jan. 2005Created by C. Ippolito January, 2005 Logistical Growth  Growth slows or stops as resources become less available Changes in birth/death rates Immigration emigration S-shaped curve  Stable at Carrying Capacity 7

Updated Jan. 2005Created by C. Ippolito January, 2005 Population Growth can be represented bycharacterized by represented by which cause a Exponential growth Logistic growth Falling growth rate S-shaped curve Limits on growth No limits on growth J-shaped curve Constant growth rate Unlimited resources Section 5-1 Concept Map Go to Section: 8

Updated Jan. 2005Created by C. Ippolito January, 2005 Homework Complete Checkpoint Question on page 121 and Questions 1-6 from Section Assessment 5-1 on page 123 9

Updated Jan. 2005Created by C. Ippolito January, 2005 Chapter 5 Section 2 Limits to Growth What factors limit population growth? How do density-dependent limiting factors differ from density-independent limiting factors? 10

Updated Jan. 2005Created by C. Ippolito January, 2005 Objectives 1.Identify the factors that limit population growth. 2.Differentiate between density- dependent and density-independent limiting factors. 11

Updated Jan. 2005Created by C. Ippolito January, 2005 Limiting Factors  Cause population growth to decrease 12 Population Size CompetitionPredationParasitismDisease Climate Extremes Human Disturbance

Updated Jan. 2005Created by C. Ippolito January, 2005 Density-Dependent Factors  Strongest when population large, dense Competition Predation Parasitism Disease 13

Updated Jan. 2005Created by C. Ippolito January, 2005 Density-Independent Factors  Affect all large and small populations in same way Human Activities  Clear cutting forests  Building projects Climactic Extremes  Droughts  Frosts 14

Updated Jan. 2005Created by C. Ippolito January, 2005 Homework Complete Checkpoint Question on page 125 and Questions 1-4 from Section Assessment 5-2 on page

Updated Jan. 2005Created by C. Ippolito January, 2005 Chapter 5 Section 3 Human Population Growth How has the size of the human population changed over time? Why do population growth rates differ in countries throughout the world? 16

Updated Jan. 2005Created by C. Ippolito January, 2005 Objectives 1.Describe how the size of the human population has changed over time. 2.Explain why population growth rates differ in countries throughout the world. 17

Updated Jan. 2005Created by C. Ippolito January, 2005 Agriculture begins Plowing and irrigation Bubonic plague Industrial Revolution begins Section 5-3 Human Population Growth Go to Section: Human Population Growth 18

Updated Jan. 2005Created by C. Ippolito January, 2005 Patterns of Population Growth  Demography Studies how human populations change over time  Demographic Transition Hypothesis Explains industrial nations growth slow down 19

Updated Jan. 2005Created by C. Ippolito January, 2005 Age Structure  predict growth 20

Updated Jan. 2005Created by C. Ippolito January, 2005 Homework Complete Checkpoint Question on page 131 and Questions 1-5 from Section Assessment 5-4 on page