Populations: Human Population Growth

Name: ______Period: ______

Populations: Human Population Growth

Historical Overview

·  Like the populations of many other living organisms, ______.

·  For most of human existence, ______.

·  ______ kept population sizes low.

·  About ______, the human population began growing more rapidly.

·  Life was made easier and safer by advances in ______.

·  Death rates were dramatically reduced due to ______.

Patterns of Population Growth

·  The scientific study of human populations is called ______.

·  Demography examines the characteristics of human populations and attempts to ______.

·  ______ help predict why some countries have high growth rates while other countries grow more slowly.

The Demographic Transition

·  Over the past century, population growth in the United States, Japan, and much of Europe has ______.

·  According to demographers, these countries have completed the______, a dramatic change in birth and death rates.

·  The demographic transition has ______.

o  In stage 1, ______.

o  In stage 2, ______. ______.

o  In stage 3, ______.

Age Structure

·  Population growth depends, in part, ____________.

·  Demographers can predict future growth using models called ______.

·  Age-structure diagrams show the population of a country broken down by ______.

Future Population Growth

·  To predict human population growth, demographers must consider the ______.

·  If growing countries move toward the demographic transition, ______.

·  Ecologists suggest that if growth does not slow down, there could be ______.

·  Economists assert that ______ may control the negative impact of population growth.

Survivorship

·  A survivorship curve is a graph showing ______ (e.g. males/females).

·  Survivorship curves can be constructed for a given ______(a group of individuals of roughly the same age) based on a life table

·  Survivorship curves tell us something about ______. There are basically three types of survivorship curves:

Type I survivorship curves are for species that have a high survival rate of the young, live out most of their expected life span and die in old age.

Examples: ______

Type II survivorship curves are for species that have a ______. Death could be due to hunting or diseases.

Examples : coral, squirrels, honey bees, birds, and many reptiles.

Type III survivorship curves are found in species that ______.

Examples: Plants, oysters and sea urchins