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Ch 3 ecosystems
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Ch 3 ecosystems

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  • 1.  Found near the equator 6% land surface 50% world’s known terrestrial plant and animalspecies
  • 2.  ≥50% destroyed or disturbed by humans Cutting trees Growing crops Grazing cattle Building settlements
  • 3.  Consequences of disappearing tropicalrainforests:1. Decreased biodiversity as species become extinct2. Accelerated global warming (why??)fewer trees to remove carbon dioxide from theatmosphere1. Changes regional weather patterns: can lead toincrease in tropical grasslands
  • 4. Fig. 3-1, p. 39
  • 5.  The four major components of the earth’s life-support system are: 1. Atmosphere (air) 2. Hydrosphere (water) 3. Geosphere (rock, soil, sediment) 4. Biosphere (living things).
  • 6.  1. Atmosphere – Air Stratosphere – ozone layer – blocks sun’s harmful UV rays Troposphere – consist of ……… 78% Nitrogen 21% Oxygen 1%greenhouse gasses –(water, carbon dioxide,and methane)
  • 7.  Hydrosphere –All of the waterfound near oron earth’ssurface. Ex – liquid, polarice, icebergs,permafrost, andwater vapor
  • 8.  Geosphere –Rock / earth,includes theearth’s core.
  • 9.  Biosphere – parts of the other 3spheres where life is found. Goal of Ecology is to understand theinteractions that occur between these
  • 10. Fig. 3-2, p. 41RockCrustAtmosphereVegetationand animalsBiosphereMantleLithosphereSoilGeosphere(crust, mantle, core)MantleCoreCrust(soil and rock)Biosphere(living organisms)Atmosphere(air)Hydrosphere(water)
  • 11. 1. One-way flow of high-qualityenergy from the sun2. Cycling of matter or nutrientsthrough parts of the biosphere3. Gravity
  • 12. SolarradiationRadiated byatmosphereas heatReflected byatmosphereMostabsorbedby ozoneAbsorbedby the earthGreenhouseeffectVisiblelightUV radiationHeat radiatedby the earthHeatTroposphereLower Stratosphere(ozone layer)Fig. 3-3, p. 41