1. Goal 2.7.3 Ecology and Human Interaction
Human Impact on the Environment

2. Humans and the Biosphere – Negative Aspects
Loss of Biodiversity
Extinction
Endangered Species
Threatened Species

3. Threats to Biodiversity
Habitat Loss
Overhunting
Deforestation

4. Figure 55.0 Deforestation of tropical forests

5. Figure 55.00x Deforestation in the United States

6. Deforestation

7. Habitat Fragmentation
Separation of habitats due to development, farming, etc.

8. Habitat corridors – protected parts of habitats that allow migration of organisms from one area to another

9. Figure 55.5 Fragmentation of a forest ecosystem

10. Habitat Degradation
Damage due to pollution
Acid Rain
Water
Land
Air

11. Think-Pair-Share

12. Answers 22. fragmentation or loss 23. loss 24. fragmentation
25. degradation
26. degradation
27. loss
28. degradation

13. ACID RAIN!!!!

14. How have pH levels changed??
And in 2003??

16. Acid Rain

17. Figure 3.10x2 Acid rain damage to statuary, 1908 & 1968

18. Water Pollution

19. Biomagnification - Higher concentrations of toxins accumulate at higher trophic levels
This is also called bioaccumulation!

21. Biological Magnification
The concentration effect occurs because DDT and other toxins are metabolized and excreted much more slowly than the nutrients that are passed from one trophic level to the next. So DDT accumulates in the bodies (especially in fat).

22. Figure 54.25 Biological magnification of DDT in a food chain

23. Air Pollution

24. Land Pollution

25. Exotic Species (introduced or nonnative species)
Organisms are not native to the particular area
In 2005, 95 pythons were captured in the Everglades. In 2006, more than 154 have been picked up.

26. 13 foot python, 6 foot gator Python Python Gator
Python
Python
Gator

27. Nonnative species video

28. Purple Loosestrife

30. Purple Loosestrife Predators
Biological control – using
natural predators
to rid of pests.

31. Defoliated Purple Loosestrife

32. Figure 55.7x Zebra mussels

34. Zebra Mussels Get Around!!

35. Predators of Zebra Mussels: Redhorse Suckers & Common Carp

36. Figure Disastrous species introductions: Nile perch (top left), brown tree snake (top right), Argentine ants (bottom left), seaweed Caulerpa (bottom right)

37. What is a very common exotic species here in NC?

38. Exploitation of Wildlife

39. Positive Aspects Population Control Conservation of Resources
Pollution Control
Species Preservation
Biological Control – using a natural predator to control a population instead of pesticides

40. Ozone Depletion Ozone protects us from the sun’s harmful UV rays
Consequences – skin cancer, mutations in algae

41. Figure 54.27a Erosion of Earth’s ozone shield: The ozone hole over the Antarctic

42. Greenhouse Effect – the sun’s heat gets trapped inside the CO2 layer, so Earth’s temperature is increasing