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Biodiversity And Biological Magnification
 

Biodiversity And Biological Magnification

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    Biodiversity And Biological Magnification Biodiversity And Biological Magnification Presentation Transcript

    • Launch
      • Using the words producer , herbivore and carnivore , rank them in order of energy from greatest to least energy.
      • Besides getting their chemical energy, what other molecule do primary consumers get from eating producers.
      • Are energy and nutrients recycled in an ecosystem?
      • Which action by humans has had the most positive ecological impact on the environment?
          • A. Introduction of snakes to the Hawaiian islands
          • B. Slash and burn farming for agriculture
          • C. Hunting of wolves to increase deer populations
          • D. Preserving old growth forests
    • Launch
      • Using the words producer , herbivore and carnivore , rank them in order of energy from greatest to least energy.
        • Producer  Herbivore  Carnivore
      • Besides getting their chemical energy, what other molecule do primary consumers get from eating producers.
        • Nitrogen!
      • Are energy and nutrients recycled in an ecosystem?
        • No!
      • Which action by humans has had the most positive ecological impact on the environment?
          • D. Preserving old growth forests
    • B 2 Biodiversity and Biological Magnification
    • Biodiversity!
      • Variety of life in an area
      • Why is it important to us?
      • Because we are part of complex food webs and energy cycles that all organisms share so decrease in biodiversity affects us too!
    • Magnification
      • To make bigger
    • Biological Magnification
      • is a process where certain substances such as pesticides or heavy metals move up the food chain and become more and more concentrated (potent) as they move up from organism to organism in the food chain.
    • Biological Magnification
      •      In food chains, webs, and pyramids: the lower the trophic level, the less amount of biological magnification that has occurred.  The higher the trophic level, the more biological magnification that has occurred.  
    •  
    •  
    • The DDT example
      • DDT was a pesticide used mainly to kill mosquitoes and pests that ruined crops (had a positive impact)
      • But what happened as DDT was used more often? The Bald Eagle was going extinct.
      • Why? DDT ruined the bird’s egg shells. No new eagles.
      • Why eagles? They were at the top of the food chain- more pollution for them.
    • Energy Pyramids
      • Energy decreases are you go up trophic levels
      • Biological Magnification (chemicals) increases as you up trophic levels
    • Quick Question!
      • Which animal will have accumulated more pollution?
        • The iguana (lizard) OR the snail
      • Which animal will have the most pollution in their bodies?