exam #4 w 4/28 (bring cheat sheet) q&a t 4/27 5-7pm in wrw 102
DESCRIPTION
Exam #4 W 4/28 (bring cheat sheet) Q&A T 4/27 5-7pm in WRW 102. Nearly Extinct Species: maybe only 100 individuals exist. Extinct. Yellowstone NP. 63 mi. 54 mi. 466 mi of roads 950 mi of backcountry trails 97 trailheads 287 backcountry campsites. - PowerPoint PPT PresentationTRANSCRIPT
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Exam #4W 4/28(bring cheat sheet)
Q&AT 4/27 5-7pm in WRW 102
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Nearly Extinct Species:maybe only 100 individuals exist
Extinct
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63 mi
54 mi
•466 mi of roads •950 mi of backcountry trails•97 trailheads•287 backcountry campsites
Yellowstone NP
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http://www.youtube.com/watch?v=2aEULGJ05So&feature=fvw
http://www.bing.com/videos/watch/video/crying-wolf-in-yellowstone/6198y2q (1:10)
http://www.ksl.com/index.php?sid=3743475
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Wolves in Yellowstone National Park
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The last wolves in Yellowstone (1920’s)
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Wolves commonly live in packs
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Social vs Solo
Packs can kill larger prey
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Packs give the ability to obtain more food, but also mean sharing food, reduced chance of reproduction, and increased chance of diseases.
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Wolves are very territorial and will kill intruders
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Wolves were re-introduced to Yellowstone in 1995
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Wolf relocation
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“hard” release:directly to new location
In Yellowstone used“soft” release:Kept in 1 acre pens to acclimate to new environment
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Wolves were re-introduced to Yellowstone in 1995
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http://www.forwolves.org/ralph/historical.html
Yellowstone area wolf packs 2004
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Wolf deaths 1995-2005
38 deaths= 33%
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Currently about 300 wolves 2003- 137 sheep and 66 cattle = $32,000
2004- 209 sheep, 57 cattle, and 6 other animals = $70,000
The cost of wolves in Yellowstone NP:
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Estimate millions of dollars in increased visitors
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Predator-predator interactions
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Predator-predator interactions
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Yellowstone Grizzly Bear population increases
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Wolves are decreasing the elk population
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Benefits of decreasing herbivore populations
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Increased Riparian Habitat
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Fig 2
Increased Riparian Habitat
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Fig 2
Increased Riparian Habitat
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Fig 3
Increased Riparian Habitat
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Fig 5
Are wolves responsible?
year1998 1999 2000 2001 1998 1999 2000 2001
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high risk low risk
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high risk low risk
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high risk low risk
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Fig 5
Are wolves responsible?
year1998 1999 2000 2001 1998 1999 2000 2001
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Fig 6
Protection vs herbivory
gully depth vs browsing
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Fig 6
The greatest difference has been in the deepest gullies, which are at the greatest risk of erosion.
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The reintroduction of wolves to Yellowstone NP has had numerous positive benefits.
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The reintroduction of wolves to Yellowstone NP has had numerous positive benefits:More food available for other carnivores
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Fig 3
The reintroduction of wolves to Yellowstone NP has had numerous positive benefits:Increased Riparian Habitat
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Exam #4W 4/28(bring cheat sheet)
Q&AT 4/27 5-7pm in WRW 102