373All habitat loss
Invasive species
Utilization
Accidental mortality
Persecution
Pollution
Natural disasters
Disease
Human disturbance
Changes in native sp. dynamics
Fires
Unknown
None
0 1000 2000 3000 4000
Number of species
Nonthreatened
ThreatenedThreats to Global Amphibian SpeciesDesignated statusJoel Sartore/NG Image CollectionInternational Union for Conservation of Nature (IUCN), 2008.Joel Sartore/NG Image CollectionCHAPTER OUTLINE
Species Richness and Biological Diversity 374
s How Many Species Are There?
s Why We Need Biodiversity
s Importance of Genetic Diversity
Endangered and Extinct Species 378
s Endangered and Threatened Species
s Areas of Declining Biological Diversity
■ EnviroDiscovery: Is Your Coffee Bird Friendly®?
s Earth’s Biodiversity Hotspots
■ What a Scientist Sees: Where Is Declining
Biological Diversity the Most Serious?
s Human Causes of Species Endangerment
■ Environmental InSight: Threats to Biodiversity
Conservation Biology 386
s Protecting Habitats
s Restoring Damaged or Destroyed Habitats
s Conserving Species
■ Environmental InSight: Efforts to Conserve
Species
Conservation Policies and Laws 390
s The Endangered Species Act
s International Conservation Policies and Laws
■ Case Study: The Challenges of Protecting Rare
SpeciesCHAPTER PLANNER✓✓
❑ Study the picture and read the opening story.
❑ Scan the Learning Objectives in each section:
p. 374 ❑ p. 378 ❑ p. 386 ❑ p. 390 ❑
❑ Read the text and study all figures and visuals.
Answer any questions.Analyze key features
❑ EnviroDiscovery, p. 380
❑ What a Scientist Sees, p. 381
❑ Environmental InSight, p. 383 ❑ p. 389 ❑
❑ Case Study, p. 393
❑ Stop: Answer the Concept Checks before
you go on:
p. 377 ❑ p. 386 ❑ p. 390 ❑ p. 392 ❑End of Chapter
❑ Review the Summary and Key Terms.
❑ Answer What is happening in this picture?
❑ Answer the Critical and Creative Thinking Questions.Interpreting Data
Which threats are having the greatest impact on
threatened species? on nonthreatened ones?