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Nearly Extinct Species: maybe only 100 individuals exist

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Presentation on theme: "Nearly Extinct Species: maybe only 100 individuals exist"— Presentation transcript:

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2 Nearly Extinct Species: maybe only 100 individuals exist

3 Yellowstone NP 63 mi 54 mi 466 mi of roads
950 mi of backcountry trails 97 trailheads 287 backcountry campsites

4 (1:10)

5 Wolves in Yellowstone National Park

6 The last wolves in Yellowstone (1920’s)

7 Wolves commonly live in packs

8 Packs can kill larger prey
Social vs Solo

9 Packs give the ability to obtain more food, but also mean sharing food, reduced chance of reproduction, and increased chance of diseases.

10 Wolves are very territorial and will kill intruders

11 Wolves were re-introduced to Yellowstone in 1995

12 Wolf relocation

13 “hard” release: directly to new location In Yellowstone used“soft” release: Kept in 1 acre pens to acclimate to new environment

14 Wolves were re-introduced to Yellowstone in 1995

15 Yellowstone area wolf packs 2004

16 Wolf deaths 38 deaths= 33%

17 The cost of wolves in Yellowstone NP:
Currently about 300 wolves 2003- 137 sheep and 66 cattle = $32,000 2004- 209 sheep, 57 cattle, and 6 other animals = $70,000

18 Estimate millions of dollars in increased visitors

19 Predator-predator interactions

20 Predator-predator interactions

21 Yellowstone Grizzly Bear population increases

22 Wolves are decreasing the elk population

23 Benefits of decreasing herbivore populations

24 Increased Riparian Habitat

25 Increased Riparian Habitat
Fig 2

26 Increased Riparian Habitat
Fig 2

27 Increased Riparian Habitat
Fig 3

28 Are wolves responsible?
year Fig 5

29 high risk low risk

30 high risk low risk

31 high risk low risk

32 Are wolves responsible?
year Fig 5

33 Protection vs herbivory
gully depth vs browsing Fig 6

34 The greatest difference has been in the deepest gullies, which are at the greatest risk of erosion.
Fig 6

35 The reintroduction of wolves to Yellowstone NP has had numerous positive benefits.

36 The reintroduction of wolves to Yellowstone NP has had numerous positive benefits: More food available for other carnivores

37 The reintroduction of wolves to Yellowstone NP has had numerous positive benefits: Increased Riparian Habitat Fig 3

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