1 / 49

Today: Grizzly Bears

Today: Grizzly Bears. We are only one of millions of species on earth. Ecological Interconnections. Grizzly Bears. Grizzly bears are big. How are bears related to each other?. Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 28.

lilly
Download Presentation

Today: Grizzly Bears

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Today: Grizzly Bears

  2. We are only one of millionsofspeciesonearth.

  3. Ecological Interconnections

  4. Grizzly Bears

  5. Grizzly bears are big.

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

  7. 12,000 years ago: the grizzly ancestor short-faced bear Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 15

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

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

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

  11. … mostly eat

  12. What do grizzly bears eat? Ray deLucia and the Grizzly Bear Fight AMNH photo # 296899 Courtesy of the American Museum of Natural History Library Services

  13. Different mouth and teeth structures can tell about an animal’s diet Fig 41.18

  14. Grizzly bear teeth

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

  16. Carnivores have a short digestive system Herbivores have a long digestive system Fig41.19

  17. Bears Humans Both humans and grizzly bears are omnivores. Our digestive systems can tell us about our ancestors. Fig 41.19

  18. About 75% of their diet is plants

  19. They also eat carrion.

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

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

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

  23. There is not much to eat in winter...

  24. Bears from temperate climates sleep over the winter in a den.(not hibernation)

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

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

  27. 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

  28. Grizzly Bear Reproduction

  29. 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

  30. 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

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

  32. 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

  33. Current Grizzly Bear range Habitat destruction and hunting have severely decreased grizzly populations in the U.S. Historical Grizzly Bear range

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

  35. Yellowstone Grizzly Bear population increases

  36. Yellowstone NP is not big enough to support a viable grizzly bear population

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

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

  39. Experiment Written Report: • Title- Concisely describe your experiment. • Author • Abstract- Summarize your work. Do not exceed 250 words. • Introduction- • Results- • Discussion- • Materials and Methods- • References- include: author name(s), article title, journal or book title, volume and page number, and year of publication Staple your approved proposal to the back of your written report.

  40. What is a reliable source? xkcd.com

  41. Building Blocks of Scientific Literature What is peer review? peer review

  42. In a peer reviewed journal each article is looked at by an editor, and then it is then sent to two anonymous reviewers. These reviewers send comments back to the editor.

  43. After each article is sent to the editor, it is then sent to two anonymous reviewers. These reviewers send comments back to the editor. They give suggestions for improvement as well as an opinion about whether it should be published or not.

  44. The editor then has three choices: Accept paper as is. (rare) Accept paper and ask for some changes. Reject paper. (20-80% rejection rate in physical sciences*) *Scholarly Consensus and Journal Rejection Rates. Lowell L. Hargens (Feb., 1988) American Sociological Review 53: 139-151 and Bang for Your Buck: Rejection Rates and Impact Factors in Ecological Journals. The Open Ecology Journal (2008) L.W. Aarssen, T. Tregenza, A.E. Budden, C.J. Lortie, J. Koricheva and R. Leimu 1: 14-19

  45. Who reviews papers? Other researchers knowledgeable in the field.

  46. What is a reliable source? xkcd.com

  47. What is a reliable source?

  48. What is a reliable source? Can be a great source of sources...

  49. What is a reliable source? Who was the author(s)? Why was it written? Where was it published? Who checked/reviewed the article? xkcd.com

More Related