Lecture 14 - November 19, 2009 |
Essential |
Background |
Outline
- management using models
- model for maximum sustainable yield
- highly controlled "take" approach
- structural approach using reserves
Using viewers and Multiple Perspectives
Life lessons that our grandmas taught us:
Don't put all your eggs in one basket.
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Models and management
- models and hypotheses
- adaptive management
- make a change in practice as an experiment
- determine outcome
- adapt strategies
- examples
- water and fertilizer use on a farm plot
- stream pollution - oxygen depletion and distance downstream
- habitat fragmentation - cooridors and reserves
- natural resource exploitation (pastures, forests, fisheries)
- global carbon budget and GCM
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models |
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Growth and harvest model
- "Logistic" model
- example of a deer population
- intrinsic growth rate
- carrying capacity
- normal growth curves
- harvest
- maximum sustainable yield (theoretical)
- other factors
- habitat degradation
- age structure
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on board
systems-sustainability
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Managing the "take"
- control the harvest or take
- if you know the carrying capacity - sort of easy
- if the carrying capacity varies or is uncertain - problem
- simulations can help learn about the system
- high "flux" systems can get out of control quickly
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refuge models |
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Structural methods to regulate population
- Ashby's law of requisite complexity
- traditional ecological knowledge
- taboos in many cultures
- sacred groves
- example with simulation models
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sacred groves
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