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cartoon. Activity: Should we drill in the Artic National Wildlife Refuge?. pretty picture. Comparison of ANWR to Continental US. Map. Pictures. Predators. Snow geese. Porcupine caribou. Vegetation. Muskoxen. Oil. Oil consumption. A Country’s wealth. Material Cultural Biological.

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  1. cartoon

  2. Activity: Should we drill in the Artic National Wildlife Refuge? pretty picture

  3. Comparison of ANWR to Continental US

  4. Map

  5. Pictures Predators Snow geese Porcupine caribou Vegetation Muskoxen Oil

  6. Oil consumption

  7. A Country’s wealth • Material • Cultural • Biological

  8. The value of biodiversity • Intrinsic value • American spend $18.2 billion to watch wildlife (vs. 5.8 billion on movie tickets and $5.9 billion on professional sporting events) • Economic value • Wildlife tourism generates $30 billion worldwide each year • Male lion living to 7 years old in Kenya - $500,000 • Elephant living to 60 years old in Kenya - $1 million • Coral reefs off Florida – $1.6 billion/year

  9. What do tropical forests provide? The economics! • 50-90% of world’s species • ½ world’s supply of • Hardwood • Food products like coffee, tea, cocoa, spices, nuts, fruits, natural rubber, resins, dyes, oils. bananas coffee

  10. Medicines • Active ingredients for 25% of all prescription drugs are derived from plants, most of which are in tropical forest. • Drugs with active ingredients from these plants generate $100 billion/year worldwide ($15.5 billion/ year in US) • 70% of plant derived cancer-fighting drugs

  11. Example: rosy periwinkle • From Madagascar • childhood leukemia and Hodgkin's disease.

  12. Drugs from frog skins • Painkiller hundreds of times more potent than morphine • New class of powerful and versatile antibiotics • Cancer-detecting hormone • And less than 5% of all frogs have been investigated.

  13. Examples Gastric brooding frog Broads in young in its stomach. Applications to treating stomach ailments? African clawed frog. Antimicrobial compound that disinfects everything it touches

  14. Sustainable use of rainforests • Sustainable harvesting of these food products over 50 years would produce • 2 times as much $ as timber production • 3 times as much $ as conversion to cattle ranching.

  15. Why is tropical deforestation going on?

  16. Why is tropical deforestation going on? • Related to population growth, poverty, government policies • Road-building • Increases accessibility • Clearing • Farming • Cattle ranching • Mining and drilling for oil • Logging – wood and firewood • Increased susceptibility to fires

  17. Species extinctions • To survive and be successul, populations must have: • Critical population density • Minimum viable population size • Background extinctions • A certain level of species extinction is normal. • Populations that do not survive environmental changes will go extinct.

  18. Extinctions in the horse lineage

  19. Past extinctions in the fossil record • Mass extinctions • Many, many species become extinct simultaneously • Causes • Climate change • Volcanic eruptions • Disease • Extraterrestrial impacts

  20. Some of the biggest extinctions • Over what time periods? • 225 million years ago >90% of all species • 65 million years ago 50% of all species

  21. Fig/ mass extinctions

  22. Lessons from the fossil record • Extinctions are irreversible • Usually followed by a period of adaptive radiation – diversity of life increased, • but different species evolved. • Recovery time may be > 10 million years

  23. Current extinctions • 20% by 2022, 50% by 2042 • Loss of species due to human impacts • Difficult to determine how many, which ones

  24. Estimates using small-scale field data • Annual loss of tropical forest habitat 1.8% • = 0.5% species loss If there are 5 million species - 25,000 species/year If there are 20 million species – 100,000 species/year If there are 100 million species – 500,000 species/year.

  25. Threats to biodiversity

  26. Habitat loss • Deforestation – tropical and temperate • Wetland loss • Coral reef destruction

  27. Example: Deforestation in Brazil

  28. Example: Deforestation in Brazil

  29. Habitat fragmentation • Often accompanies habitat loss • Division of formerly continuous landscape into smaller, often isolated pieces • Edge effects • Invasion by exotics • Hotter, drier, windier conditions • Proximity to humans • Smaller area • Large carnivores need large areas

  30. Exotic species • Introduced, non-native species • Out-compete/exclude native species • Often, no predators in new environment

  31. Example: Purple loosestrife • Replaces cattails, willows, horsetails, other plants • Eliminates food and cover for ducks, geese, muskrats, mink, bog turtle, sandhill cranes, others • Manual control unsuccessful. • Now trying biological control with introduced beetles

  32. Hunting

  33. Hunting • Decreases population size • Can remove top predator or keystone species

  34. Example: Northern right whale • Hunted because • Easy to find • Slow • Lots of oil • Hunting reduced population by 97% to 600 individuals • Protected in 1949, now threatened by habitat degradation

  35. Environmental degradation

  36. Environmental degradation • Air pollution • Water pollution • Noise and light pollution • Climate change • Warming, precipitation • Land degradation • Erosion from deforestation, poor farming practices • Removes nutrient-rich top-soil • Dumps sediment into rivers and lakes

  37. Example: Sea turtles • Come on shore to lay eggs. • Disturbed by bright lights, tend to choose darker beaches. • Hatchlings are confused by lights, head in the wrong direction.

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