1. Chapter 10
Biodiversity

2. Lesson 10.1
What is Biodiversity??

3. Biodiversity Short for biological diversity.
The number and variety of different species in a given area.

4. Cataloging Number of species known to science 1.7 million
Most are insects.
Estimated number of species on Earth 10 million.

5. Attention to Species Some harder to study.
Receive less attention than larger more familiar species.
Less known about insects and fungi than trees and mammals.

6. 3 Levels of Diversity Species diversity Genetic diversity
Ecosystem diversity

7. Species Diversity
All the differences between populations of species as well as different species.

8. Ecosystem Diversity
The variety of habitats, communities, and ecological processes within and between ecosystems.

9. Genetic Diversity
All the different genes contained within all members of a population.

10. Benefits Stability of the ecosystem (keystone species).
Uses of a variety of species (medicines, foods, etc.)

11. Keystone Species
Species that is critical to the function of an ecosystem.
Hunters kill off otters in an area, sea urchin multiply, kelp (pharmaceuticals, food industry, etc.) goes down.

12. Medical Uses
1/4 of medicines prescribed in the US are derived from plants.
Almost all antibiotics are derived from fungi.

13. Section Review Questions page 244 #1-3.
Agricultural Uses
Most crops today derived from a few areas of high biodiversity.
Hybrids.
Famines have been caused when disease kills off crops in areas of low biodiversity.
Section Review Questions page 244 #1-3.

14. Lesson 10.2
Biodiversity at Risk…

15. Mass Extinction? Scientists warn of a current mass extinction
Extinc. Increase by 50X since 1800
Up to 25% of species
Humans primary cause

16. At Risk Species Those that migrate Need large or special habitat
Exploited by humans

17. The Road to Extinction
Endangered= likely to become extinct if not protected
Threatened= declining population and likely to become endangered if not protected

18. Human Causes Destruction of habitat Introduction of nonnative species
Pollution
Overharvesting

19. Habitat Destruction Cause of 75% of extinctions now occurring.
Florida Panther
p.246 fig 7

20. Exotic Species= nonnative species
Poaching= illegal hunting, fishing, harvesting, or trade of wildlife
Pollution- pesticides, cleaning agents, drugs, and other chemicals used by humans make their way into food webs

21. Section Review Questions: page 251 #1-4
Endemic Species= native to and found only in a limited area.
The rocky Alpine, Flett’s violet
Section Review Questions: page 251 #1-4

22. The Future of Biodiversity
Lesson 10.3
The Future of Biodiversity

23. Section review: page 257 #1-4
Saving Species
Captive breeding
Zoos aren’t all bad!
Preserving genetic material
Habitat preservation
Legal protection
International cooperation