1. Biodiversity at Risk

2. Essential Questions What factors influence changes in populations?
How do species interact with one another?
- How has the human population changed over time?
What is biodiversity?
How do human population dynamics threaten biodiversity?

3. Mass Extinctions 5 during the past 500,000,000 years Dinosaurs 65mya
Asteroid
Volcanism
Continental Drift
Competition from Mammals

4. Some scientists say we are going through another mass extinction
25% of species extinct since 1800

5. Endangered Species
Likely to become extinct if protective measures are not taken

6. Threatened Species
Declining population and is likely to become endangered

7. Endangered Species Act
1973

8. International Union for Conservation of Nature
Founded in 1948
1,100 member organizations
11,000 scientists

9. IUCN Red List 44,838 species assessed
868 species extinct or extinct in the wild
3,246 critically endangered
4,770 endangered
8,912 vulnerable

10. IUCN Red List 22% of mammals threatened 31% of amphibians threatened
Indicator species
27% of coral reefs threatened

11. How do humans cause extinctions?
Habitat Destruction
Invasive Species
Hunting
Pollution