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Threats to Biodiversity and Extinction Crisis: Examining the Impacts and Challenges

This article discusses the key factors affecting biodiversity, including genetic and ecosystem diversity, habitat loss, competition, and the uneven distribution of resources. It also explores the potential for a massive die-off of tropical species and the impact of rural population decline and urban population growth on biodiversity. The article concludes by examining the need for conservation efforts and sustainable resource management.

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Threats to Biodiversity and Extinction Crisis: Examining the Impacts and Challenges

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  1. Exam 1 key posted Office Hours...

  2. Fig 25.14 New species and extinction

  3. Fig 56.3 Genetic Diversity Biodiversity- number of species within an area Ecosystem Diversity

  4. If a species loses genetic diversity, it can go extinct Fig 56.11

  5. Fig 56.10 Extinction vortex

  6. Fig55.6 Resources are not evenly distributed

  7. Fig 56.3 Genetic Diversity Biodiversity- number of species within an area Ecosystem Diversity

  8. Larger areas can support more biodiversity Fig 54.28 Islands

  9. Larger areas can support more biodiversity Fig 54.26 # bird species

  10. Water is critical for biodiversity Fig 54.25

  11. New species can have an affect throughout the ecosystem Fig 54.16

  12. Interactions include area, climate, competition...

  13. Increased numbers of one species can reduce the population of other species

  14. Fig 54.3 Competition limits where species can live

  15. Fig 54.3 niche- the specific environment where a species lives

  16. Niche overlap leads to competition.

  17. Prolonged direct competition is rare.

  18. Prolonged direct competition is rare.

  19. Fig 54.4 Where these species overlap, they do not compete.

  20. Changes in Extinctions and Biodiversity

  21. Have we overstated the tropical biodiversity crisis?William F. LauranceTrends in Ecology & EvolutionVol. 22: 65-70 February 2007

  22. Are we on the verge of a massive die-off of tropical species?

  23. Increased rural density leads to decreased forest.

  24. The good news? About 21–24% of species in the Asian tropics and 16–35% of species in the African tropics are threatened with possible extinction.

  25. Rural populations are expected to decline.

  26. Substantial areas of agricultural land are likely to be abandoned. This could enable significant forest regeneration, which could help buffer species losses from deforestation.

  27. Fig 56.13 Not all habitats are equal

  28. A third to a half of all old-growth species avoid younger (<30-year-old) regrowth.

  29. Technology means that more resources can be extracted by fewer people.

  30. Rural populations are expected to decline, but increased urban population will demand more resources.

  31. Exam 1 key posted Office Hours...

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