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Landuse / Landcover Change

Landuse / Landcover Change. Implications of landuse/landcover change on earth’s energy balance. Implications of landuse/landcover change on hydrology. Effects of landuse/landcover change on river channels. How does landuse/landcover change affect biological diversity?. Island Biogeography.

brigitte-lennon
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Landuse / Landcover Change

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  1. Landuse / Landcover Change

  2. Implications of landuse/landcover change on earth’s energy balance

  3. Implications of landuse/landcover change on hydrology

  4. Effects of landuse/landcover change on river channels

  5. How does landuse/landcover change affect biological diversity?

  6. Island Biogeography

  7. Unique characteristics of islands • Isolation • Disturbances can be catastrophic • Less genetic diversity (than mainland settings)

  8. Charles Darwin (1809-1882)

  9. Example: Biological diversity of the Pacific Islands

  10. Species Diversity More species on bigger islands Fewer species on more isolated islands

  11. What determines the number of species on an island?

  12. Colonization of Islands As the number of species on an island increases, the rate of colonization will decline because available ecological niches become fewer Source: MacArthur and Wilson. The Theory of Island Biogeography

  13. Species Extinctions As the number of species on an island increases, the rate of extinction will increase because species compete for resources Source: MacArthur and Wilson. The Theory of Island Biogeography

  14. Species Equilibrium The number of species on an island represents a balance between colonization and extinction Source: MacArthur and Wilson. The Theory of Island Biogeography

  15. How does this relate to landuse/landcover change?

  16. Species Extinctions Source: World Conservation Monitoring Centre, "Global Biodiversity" Chapman & Hall, London, 1992)

  17. Biological Dynamics of Forest Fragments Project, Manaus, Brazil. Source: Dept. of Biology, Univ of North Carolina Chapel Hill.

  18. Source: Bolger et al., 1997. Response of rodents to habitat fragmentation in coastal southern California. Ecological Applications, 7(2): 552-563. (note: trend line added to rodents vs shrub size figure)

  19. Conservation initiatives

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