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Chapter 58 Conservation Biology. Biology 101 Tri-County Technical College Pendleton, SC. Human Impact. Accelerating pace of human-caused extinctions raises serious questions about future of biological diversity on Earth

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chapter 58 conservation biology

Chapter 58 Conservation Biology

Biology 101

Tri-County Technical College

Pendleton, SC

human impact
Human Impact
  • Accelerating pace of human-caused extinctions raises serious questions about future of biological diversity on Earth
  • Conservation biology is scientific study of how to preserve diversity of life
  • Estimated extinctions range from 10% to 50% by 2050
    • Hawaii, New Zealand, North America, Australia, and on and on
extinctions
Extinctions
  • Over 50% of all medicines contain natural plant or animal product
  • Extinctions deprive us of opportunity to study ecological relationships among organisms
  • Aesthetic pleasure
  • Continents versus islands
  • Rare species versus common species
most important factor
Most Important Factor
  • Habitat loss most important contributing factor to extinctions in U.S.
  • Traditional versus “sun-grown” coffee plantations
  • Introduced pests, predators, and competitors have eliminated many species
  • Overexploitation driven many to extinction
    • passenger pigeon; Steller’s sea lion
news not getting any better
News not getting any better…
  • Elephants and rhinoceroses
  • Orchids, parrots, reptiles, and tropical reef fishes
  • Loss of mutualists threaten some species
    • Plants and pollinators
  • Global warming threatens some species
  • > of only 1oC will shift temperature range 150 km north
warning warning
Warning…warning
  • Estimates are for a 2-5 degree C shift
  • Care to move 300-750 km north?
  • New climates will appear and old climates will disappear
  • We can make a difference but we must choose NOW!!
  • Design recovery plans
better to light a candle
Better to light a candle…
  • Captive propagation
  • Establishing parks and preserves
  • Restoring degraded ecosystems
  • Use less, reuse, recycle, and reclaim
  • Markets and conservation
  • Biodiversity from scientific, economic, and ethical point of view
    • We lose just one…any one…and we all suffer
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