by Miller & Levine
[complete Table of Contents]
the pull-down menu to jump to any of the Book's 40 Chapters:
web site with population statistics of countries worldwide, which includes
age-specific population data
chapter, you will read about patterns of population growth and the major
factors that affect the growth of populations. You will also find out
how biological and social factors affect the growth of human populations.
The links below lead to additional resources to help you with this chapter.
These include Hot Links to Web sites related to the topics in this
chapter, the Take It to the Net activities referred to in your
textbook, a Self-Test you can use to test your knowledge of this
chapter, and Teaching Links that instructors may find useful for
Section 5-1: How Populations Grow
characteristics of a population are its geographic distribution, density,
and growth rate.
Three factors affect population size:
the number of births, the number of deaths, and the number of individuals
that enter or leave the population.
Under ideal conditions and with unlimited
resources, a population will continue to grow in a pattern called exponential
growth. As resources are used up and population growth slows or stops,
the population exhibits logistic growth.
Section 5-2: Limits to Growth
Density-dependent limiting factors include
competition, predation, parasitism, and disease.
Unusual weather, natural disasters, seasonal
cycles, and certain human activitiessuch as damming rivers and clear-cutting
forestsare all examples of density-independent limiting factors.
Section 5-3: Human Population Growth
Like the populations of many other living
organisms, the size of the human population tends to increase with time.
The characteristics of populations, and
the social and economic factors that affect them, explain why some countries
have high population growth rates while populations of other countries
grow slowly or not at all.