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Chapter 10: Biodiversity

Chapter 10: Biodiversity

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Chapter 10: Biodiversity

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  1. Chapter 10: Biodiversity Mr. Manskopf Notes also are at http://www.manskopf.com

  2. Chapter 10 Biodiversity Big Ideas • There is a huge diversity of life on Earth that is critical to all species. . • There are some factors about species that make them prone to extinction. • Human activities are causing large numbers of species to go extinct.

  3. Section 1: What is biodiversity? • How many species live on Earth? • Describe the types of biodiversity. • Explain why biodiversity is important. • Terms: biodiversity, genes, keystone species, ecotourism

  4. About 1.7 million species are known • Estimates vary from greater than 10 million • Why so many unknown?

  5. Biodiversity Which species rule the world?

  6. Biodiversity • Biodiversity: the number of different species in a given area • Tropical rain forests • What factors lead to biodiversity?

  7. Types of Biodiversity Species Biodiversity: number of different species in an area Ecosystem Diversity how many types of habitats in an area Genetic Diversity the number of genes in all members of a population

  8. Ecosystem diversity often leads to species diversity and often genetic diversity

  9. What is a gene? • Gene: a piece of DNA code for a specific trait inherited • Tall, short, brown eyes, etc. Genetic Diversity among corn

  10. Why is genetic diversity important? Cavendish banana “ The fungus Fusarium oxysporum wiped out the previous species of bananas (the Gros Michel) in the 1950s. Now it’s back, having evolved to be able to take on the previously resistant “back-up” species of banana — the Cavendish — that replaced the superior Gros Michel banana after it was wiped out. “

  11. Benefits of Diversity Keystone Species: species that is critical to ecosystem survival • Sea otter • Grey Wolf • Beaver

  12. Keystone Species Food Web Depends Upon Krill

  13. Benefits of Diversity • Genetic Diversity Key To Survival • small isolated populations unlikely to survive • Genetic mutations from inbreeding can occur • More diversity = more likely to survive

  14. Benefits of Diversity • Medical, Industrial, Agricultural uses • Food, cloths, shelter, chemicals and medicine often comes from variety of organisms See table 1 pages 261

  15. Benefits of Biodiversity • Ethics, Aesthetics and Recreation • Moral, religious purposes for all species • Personal enjoyment Dolphin Tour Off NJ Beaches

  16. Benefits of Biodiversity • Ecotourism: tourisms that supports conservation • Wildlife, birding, wilderness hiking • People make $ by having people view wildlife

  17. Section 1 Review • How many species live on Earth? • Describe the types of biodiversity. • Explain why biodiversity is important. • Terms: biodiversity, genes, keystone species, ecotourism

  18. Section 2: Biodiversity at Risk • What does it mean when a species is threatened or endangered? • What makes some species more prone to extinction? • What are the largest threats to biodiversity? • What areas are likely to have high biodiversity? • Terms: endangered species, threatened species, exotic species, endemic species, poaching

  19. Biodiversity has increased over time, but mass extinctions are also natural events (5 major events) How do we get this data?

  20. Extinctions • Species gone forever • NORMAL • Mass Extinction: short period of time when large number of species go extinct (65 MYA) • Currently in mass extinction…caused by humans • Rapid climate change

  21. Extinctions Certain traits make some species more vulnerable: • Small populations • Specialized • Need large range • Migration • Valuable to humans

  22. Species squeezed into smaller and smaller fragmented habitat

  23. Current Extinctions • Endangered Species: is likely to go extinct if actions not taken • Threatened: population declining and likely to become endangered

  24. Current Extinctions • TNC estimates 1/3rd of 21,000 identified U.S. animal and plant species are vulnerable. • 30,000 of the world’s species and 1,200 in U.S. are officially endangered.

  25. Types of endangered species worldwide

  26. How do humans cause extinctions? • “HIPPO” • Habitat destruction • Invasive species • Population (humans) growth • Pollution • Overharvesting

  27. Habitat Loss/Fragmentation

  28. Humans Causing Extinctions • Habitat Destruction causes 75% maybe • Large creatures need lot of land • Invasive Species: exotic species not native to area can destroy an ecosystem

  29. Invasive Species

  30. Invasive Species CA Agricultural Checkpoints

  31. Humans Causing Extinction • Over-harvesting excessive hunting (bison in U.S.) • Poaching: illegal hunting • Common in poor countries for food, medicines, income • Pollution air, water, land

  32. Areas of Critical Biodiversity • Hotspots: areas threatened that contain high biodiversity • Roughly 25 worldwide • Madagascar • Parts of California

  33. Hotspots Large numbers of endemic species: species native to that area

  34. US Hotspots

  35. Areas of Critical Biodiversity • Tropical Rain Forests • Coral Reefs • Coastal Ecosystems • Islands Why these areas????

  36. Section 2 Review • What does it mean when a species is threatened or endangered? • What makes some species more prone to extinction? • What are the largest threats to biodiversity? • What areas are likely to have high biodiversity? • Terms: endangered species, threatened species, exotic species, endemic species, poaching

  37. Section 3: Future of Biodiversity • List and describe efforts to save individual species. • Explain the advantages of protecting entire ecosystems rather than individual species. • Describe the main parts of the Endangered Species Act. • Terms: Endangered Species Act, habitat conservation plans, CITES

  38. Saving Individual Species Captive Breeding Programs: breeding species in captivity with hopes of reintroducing into native habitats Germ Plasm: saving genetic material for possible future use (seeds, eggs, DNA) Zoos and Aquariums

  39. Saving Individual Species • Does little to preserve species • Captive individuals may not survive in wild • Small populations have difficult time with inbreeding, diseases • Last resorts

  40. Preserving Habitat and Ecosystems • Most effective way to save a species is protect its habitat. • Some species require large areas • What about when they leave protected areas? (Wolves in Yellowstone

  41. Legal Protections • Many countries have laws to protect wildlife • Some weak some strong • U.S. law Endangered Species Act (ESA)

  42. ESA Endangered Species Act • Passed 1973 • Protect plant and animals in danger of extinction • List created of those threatened and endangered • Currently 1,272 listed

  43. Some listed species include