1. A Changing Landscape--How humans have impacted ecosystems  How have we changed the landscape?  What are the consequences of these changes?  How have we changed the landscape?  What are the consequences of these changes?

2. What was the Green Revolution?  1950s--> Increase food production  HOW?  1) New, highly productive varieties of crops (High yield wheat & corn)  2) Monoculture--Growing the same crop  3) Chemical pesticides & fertilizers  4) Heavy equipment  1950s--> Increase food production  HOW?  1) New, highly productive varieties of crops (High yield wheat & corn)  2) Monoculture--Growing the same crop  3) Chemical pesticides & fertilizers  4) Heavy equipment

3. Industrial and Agricultural Chemicals  High concentrations can cause serious problems for wildlife and humans. Widespread DDT use in the 1950s threatened fish-eating birds like pelicans, osprey, falcons, and bald eagles. It caused females to lay eggs with thin, fragile shells, reducing hatching rates and causing a drop in birth populations. Since DDT was banned in the 1970s, bird populations are recovering.  Still a concern is mercury, which accumulates in the bodies of certain marine fish such as tuna and swordfish.  High concentrations can cause serious problems for wildlife and humans. Widespread DDT use in the 1950s threatened fish-eating birds like pelicans, osprey, falcons, and bald eagles. It caused females to lay eggs with thin, fragile shells, reducing hatching rates and causing a drop in birth populations. Since DDT was banned in the 1970s, bird populations are recovering.  Still a concern is mercury, which accumulates in the bodies of certain marine fish such as tuna and swordfish.

4. In the highest trophic levels, pollutant concentrations may reach 10 million times their original concentration in the environment.

5. Biological Magnification

6. Eutrophication  excessive nutrients in a lake or other body of water, usually caused by runoff of nutrients (animal waste, fertilizers, sewage) from the land...

7. Stages of Lake Succession

8. Ozone Layer Thinning

9. The Ozone Hole

10. Biodiversity--Types  Species Diversity--The variety of species within a community  Genetic Diversity-- the genetic variability within a species.  Ecosystem Diversity-- the organization of species in an area into distinctive plant and animal communities.  Species Diversity--The variety of species within a community  Genetic Diversity-- the genetic variability within a species.  Ecosystem Diversity-- the organization of species in an area into distinctive plant and animal communities.

11. THREATS TO BIODIVERSITY

13. Services of an Ecosystem ( What an Ecosystem does for us)  Solar Energy  Production of oxygen  Storage & Recycling nutrients  Regulation of climate  Purification--H2O & Air  Storage of fresh H2O  Food Production  Nursery habitats for wildlife  Detox. waste  Natural Pest & Disease control  Solar Energy  Production of oxygen  Storage & Recycling nutrients  Regulation of climate  Purification--H2O & Air  Storage of fresh H2O  Food Production  Nursery habitats for wildlife  Detox. waste  Natural Pest & Disease control

14. HEAVY METALS Why are they harmful?  Lead (Pb)  Mercury (Hg)  Cadmium (Cd)  All interfere with normal nervous system function(s)  Note--Some heavy metals are important in our diet--Fe (iron) Ca (calcium)  Lead (Pb)  Mercury (Hg)  Cadmium (Cd)  All interfere with normal nervous system function(s)  Note--Some heavy metals are important in our diet--Fe (iron) Ca (calcium)

15. BIODIVERSITY HOT SPOTS

16. CONSERVING BIODIVERSITY  Identify & Protect habitat  HOW?  National Parks & wildlife refuges  Captive breeding programs  Identify & Protect habitat  HOW?  National Parks & wildlife refuges  Captive breeding programs