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Chapter 10 Section 2

Chapter 10 Section 2. Biodiversity at Risk. Objectives. Define and give examples of endangered and threatened species Describe several ways that species are being threatened with extinction globally Explain which types of threats are having the largest impact on biodiversity

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Chapter 10 Section 2

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  1. Chapter 10 Section 2 Biodiversity at Risk

  2. Objectives • Define and give examples of endangered and threatened species • Describe several ways that species are being threatened with extinction globally • Explain which types of threats are having the largest impact on biodiversity • List areas of the world that have high levels of biodiversity and many threats to species • Compare the amount of biodiversity in the US to that of the rest of the world

  3. Species Prone to Extinction • Rate of extinction is estimated to have increased by a multiple of 50 since 1800 • Humans are primary cause of the extinctions

  4. Species Prone to Extinction • Species with small populations in limited areas can easily become extinct • Those that migrate, need large or special habitats, those exploited by humans

  5. Species Prone to Extinction • Endangered species: species that is likely to become extinct if protective measures are not taken immediately • Threatened species: species that has declining population and likely to become endangered if it is not protected

  6. How Do Humans Cause Extinction • Human population growth has accelerated and so has the rate of extinction • Major causes of extinction are destruction of habitats, introduction of nonnative species, pollution, and overharvesting of species

  7. How Do Humans Cause Extinction • Habitat Destruction and Fragmentation • As human population grows, use more land to build homes and harvest resources

  8. How Do Humans Cause Extinction • Invasive Exotic Species • Exotic species: species that is not native to a particular region • Exotic species can threaten native species that have no natural defenses against them

  9. How Do Humans Cause Extinction • Harvesting, Hunting, Poaching • Excessive harvesting and hunting of species can lead to extinction • Poaching: illegal hunting, harvesting, and trade of wildlife

  10. How Do Humans Cause Extinction • Pollution • Pesticides, cleaning agents, drugs, and other chemicals used by humans are making their way into food webs around the globe

  11. Areas of Critical Biodiversity • Endemic species: species that are native to and found only within a limited area • Large amounts = biodiversity

  12. Areas of Critical Biodiversity • Tropical Rain Forest

  13. Areas of Critical Biodiversity • Coral Reefs and Coastal Estuaries

  14. Areas of Critical Biodiversity • Islands

  15. Biodiversity Hotspots • Biodiversity hotspots: the most threatened areas of high species diversity on Earth

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