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Putting Animal Physiology and Ecology together… Grizzly Bears

Putting Animal Physiology and Ecology together… Grizzly Bears. Ecological Interconnections. CB 54.2. Interconnections. We are only one of millions of species on earth. Why are species going extinct?. 2%. 36%. 39%. 23%. Nearly Extinct Species: maybe only 100 individuals exist. CB 55.3.

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Putting Animal Physiology and Ecology together… Grizzly Bears

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  1. Putting Animal Physiology and Ecology together… Grizzly Bears

  2. Ecological Interconnections

  3. CB 54.2 Interconnections

  4. We are only one of millionsofspeciesonearth.

  5. Why are species going extinct? 2% 36% 39% 23%

  6. Nearly Extinct Species:maybe only 100 individuals exist CB 55.3

  7. Habitat loss and fragmentation has been extensive in the US due to human modification of the environment

  8. What responsibility do we have for the well-being of non-humans? Under what circumstance should we put the needs of non-humans above the needs of humans?

  9. Grizzly Bears

  10. How are bears related to each other? Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 28

  11. 12,000 years ago: the grizzly ancestor short-faced bear Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 15

  12. Short-faced vs grizzly bears Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 17 and 23

  13. How closely related are these bear species? Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 28

  14. Grizzly-Polar bear hybrid (from a zoo) Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 200

  15. Grizzly bears live most of their lives alone Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 78

  16. Grizzly bears live most of their lives alone. What do they do? Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 78

  17. About 75% of their diet is plants

  18. They also eat carrion.

  19. Some grizzlies are excellent predators, but most eat carrion. Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 85

  20. Bears from temperate climates sleep over the winter in a den.

  21. Grizzlies have an amazing ability to gain and lose weight. Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 62 and 63

  22. Grizzlies constant search for food can lead to conflicts with humans. Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 186

  23. Grizzlies constant search for food can lead to conflicts with humans. Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 215

  24. Different teeth and diets grizzly cat dog panda Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 54

  25. Grizzly reproduction Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 59

  26. Grizzly Bear Reproduction

  27. Grizzly cubs are born in the den and are very small (~1 lb) Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 58

  28. Female Grizzly Bear reproductive cycle den w/ mother fall juveniles on own winter summer young born fertiliz-ation spring Females are not fertile when caring for offspring

  29. Female bears are very protective of their young Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 76

  30. Infanticide: males will try to kill young so that mother will become fertile Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 77

  31. Human-Bear Interactions

  32. Current Grizzly Bear range Historical Grizzly Bear range

  33. Hunting Grizzlies

  34. Hunters Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 216

  35. Studying Grizzlies CB55.11

  36. Yellowstone NP 63 mi 54 mi • 466 mi of roads • 950 mi of backcountry trails • 97 trailheads • 287 backcountry campsites

  37. Yellowstone Grizzly Bear population increases CB 55.12

  38. Artificial corridors allow animals to cross fragmented areas CB 55.16 CB 55.16

  39. CB 55.18 Where do grizzly bears fit? Are they important? How much of our resources should we share with grizzly bears?

  40. Animal behavior is unpredictable and inexplicable Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 231

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