Top Carnivore - Friend or Foe
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Transcript of Top Carnivore - Friend or Foe
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Top Carnivore - Friend or Foe
Review where we are in the courseLink to Wednesday lecture
Exponential vs. linear growthExplore: Top Carnivore: Friend or Foe
Food chainsFood WebsBioaccumulationCompetitor or friend of conservation
Readings: Yellowstone StoryLecture on Conservation
Concept of Shrinking Expectations
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Course Context
• Very simple diagram
Earth Systems• Biosphere• Hydrosphere• Lithosphere• Atmosphere
Air ResourcesWater Resources
Ecosystem Resourcese.g., forests
Other (Non- Renewable) Resourcese.g., oil
I. = P.A.T.
Population(# people)
Affluence(GDP/person)Technology(tons CO2/GDP)
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Yoram’s Final Two Statements“I am a technology realist”
“That is why I think a carbon tax is needed”
Vehicle fuel efficiency is target of proposed taxVehicle fuel efficiency is target of proposed taxCars blamed for global warming; Eyman fires back
By BRIAN SLODYSKOP-I REPORTER
February 7, 2008
OLYMPIA -- Seattle Mayor Greg Nickels and Sen. Ed Murray, D-Seattle, want car owners to warm to the inconvenient truth of cutting vehicle emissions.
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Pick an option for your summer job (50 days)
1 2
0%0%
1. $0.01, $0.02, $0.04, $0.08, etc.
2. $100.00, $100.00, $100.00, $100.00
Answer Now! 10
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• Day 20: Penny person = $10,486 ($5243)• Day 50: 11.259 trillion dollars
Outcome
• Day 20: $100 person = $2000 ($100)
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World Population (est.), -10,000 to 2300
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-10000 -7500 -5000 -2500 0 2500
Billions
18501900
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1950
1975
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1968: Garrett Hardin freaks out
Tom Hinckley 1968 Not freaking out
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Linear vs. exponential growth (or decay)
• Exponential: Nt = Noekt
• No - initial quantity• t - time• Nt - quantity after time to
• k - constant• e - exponential function (e is the base of the
natural log)
• Linear: Nt = N0*t
http://lectureonline.cl.msu.edu/~mmp/applist/decay/decay.htm
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Growth/Time 0 1 2 3 4 5 6 7 8 9 10Linear 2 4 6 8 10 12 14 16 18 20 22Exponential 2 4 8 16 32 64 128 256 512 1024 2048
Illustration/Reference
http://www.watersfoundation.org/index.cfm?fuseaction=home.main
Population Growth: Has been exponential
Population Growth is a function of a number of parameters
With each time interval:Linear: increases by 2 (+ 2)Exponential: doubles (*2)
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• 99th day
The parable of the lily pond: a test
• If lilies growing in a pond double every day, and on the 100th day they cover the whole pond, on what day do they cover half of the pond?
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Food Chains, Food Webs, Trophic Levels, Bioaccumulation
• Obey 1st & 2nd laws of Thermodynamics– Energy cannot be created or destroyed;
only its form can change.– Conversion of energy is inefficient
• Main source of energy is the sun.• Role of biogeochemical cycles.
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/F/FoodChains.html
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Trophic Pyramid
• Very simple diagram• 10% rule
Herbivores
Omnivores
Top CarnivoresDetritus or DecompositionChain
• Connections between levels: chain or web
Compounds from Biogeochemical
cycles
Producers
1 - 5%
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Food Web Example
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Bioaccumulation• As a consequence of energy flow through
a food chain (i.e., you must eat a lot!), certain compounds can accumulate.
• Examples– Fat soluble compounds
• DDT• Tetra-ethyl lead• Methyl mercury• Dioxin• PCBs
160
19
10
8.00001
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Top Carnivores: Friend or Foe
““Killing sea lions will not save Columbia River salmon”Killing sea lions will not save Columbia River salmon”By John Balzar
Special to The TimesFebruary 7, 2008
Foe
Friend• Reading for Today• Wolves in Yellowstone & Cougars in Zion N Park• Grizzly or wolf as an umbrella species
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Foe
• Shared space• Status• Fear• Competition
• Food• Space
• Example with sea lions
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Which of the following statements is false.
0%
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0% 1. Wolves were extirpated in 19262. Beavers returned after wolves
returned3. Elk browsing increases aspens &
willows4. Rivers became incised with elk
browsing5. Wolves are carnivores & predators
Answer Now! 10
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Impact is a trophic cascade!
http://www.forestry.oregonstate.edu/aspen/
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Visuals
W.J. Ripple photographs, OSU
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Impact is a trophic cascade!
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Zion National Park, Utah
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Summary: Top Carnivores
• Exponential vs. linear changes• First and second laws of thermodynamics• Energy from the sun• Biogeochemical Cycles• Food chains, webs, trophic cascades,
bioaccumulation• Foundation for Conservation Biology• Fundamental changes in how we think!
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Concept of Shrinking Expectations
Current Condition or state
Future Condition or state
Historical Condition or state
Russell Jim