1. Overexploitation
Tokyo Tuna Market

2. Commercial exploitation

3. Morel Mushrooms for Sale

4. Coral harvested for jewelry

5. Rhinoceros exploitation

6. Rhino horn
Products –
Dagger market
in Yemen

7. Rhino Horn in Traditional Medicine

8. Wild Blueberries

9. Wild Salmon

10. Egret plumes and feathered hat

11. Tragedy of the Commons

12. Japanese Whaling Ships

13. Subsistence exploitation

14. Subsistence Hunting

15. Recreational exploitation

16. Hunting as Recreation

17. Shell Collection

18. Gordon Alcorn

19. Photographic safari

20. Cheetah on Land Rover

21. Incidental exploitation

22. Kemp’s Ridley Sea Turtle

23. Trawling

24. Shrimp net with TED – turtle exclusion device

25. Indirect exploitation

26. Domestic cats preying on small birds

27. Pet market

28. Tropical Fish for Aquarium Trade

29. Cactus Market

30. Saguaro Cactus

31. Consequences of Overexploitation
Population Effects
- Reduction in population size
- Age structure
- Sex ratio
- Genetic structure
2. Ecosystem Effects

32. Age Structure: A – fish in typical population B – fish taken by fishing

33. Sex Ratios – The Fisher

34. Fisher Distribution

35. Genetic Structure – Coho Salmon

36. Genetic Structure – Coho Salmon

37. Ecosystem Structure – Loss of Large Trees

38. Planting Sequoias

39. Giant Redwood

40. Redwood Forest in the Air

41. Ecosystem Structure – Loss of Snags

42. Loss of Keystone Species - Sea Otter with Sea Urchin

44. Loss of Keystone Species - Glyptodont

45. Exotic Species

46. Mrs. Black Horse, Cheyenne Nation, and dog travois

48. American Chestnut

49. Cracking From Chestnut Blight

50. Exotic Species
Conservation biologists typically call introduced species “exotic species” - species which live outside their natural range
Botanists typically refer to exotic plants as alien species
Other terms you may see include biological invaders, introduced species, invasive species, non-indigenous species, non-native species (my preferred term)

51. How Do Exotic Species Get Dispersed?
1. Stowaways
2. Subsistence and Commerce
Recreation
Whimsy or aesthetics
Science
Biological Control

52. Norway Rat as ship rat

53. Earthworms and pre-exotic distribution

54. Cars transport seeds via mud stuck to car

55. Ballast Water Discharge

58. Commerce and Subsistence

59. Commerce and Subsistence

60. Monterey Pine

61. Blue Gum Eucalyptus

62. Feral Pig - Florida