Spatial-Stochastic: Difference between revisions
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= Stochasticity and Space Project = | = Stochasticity and Space Project = | ||
==Things we Need:== | |||
* Explicit hypotheses | |||
* links to papers, | |||
* state variables | |||
* definitions of agent traits w.r.t. space variables, | |||
* forcing conditions | |||
* sample code? | |||
Looks like we can do anything on a square grid in NetLogo, and even import GIS data. | |||
==Proposed: == | |||
===State variables:=== | |||
* Limiting resource (which can also be in excess)(E.g., water, nutrients) | |||
* Patch/cell/region ability to conserve resource (E.g., soil organic matter) | |||
* Patch connections (e.g., elevation -> horizontal flow) | |||
* Connectivity (i.e. how well patches are connected) | |||
===Agent characteristics:=== | |||
* Efficiency in capturing resource | |||
* Efficiency in surviving low-resource conditions | |||
* R-k strategy | |||
* Spatial reach, for getting resource or spreading offspring | |||
* Interactions? One kind of agent more efficient in the presence of another? | |||
* Threshold responses to external inputs, or saturation | |||
* What ecological processes does an agent do? (e.g. growth, water uptake, nutrient uptake, death, dispersal etc.) | |||
===Forcing conditions:=== | |||
* Input of resource, variable in space or time | |||
* Variance of input | |||
===Hypotheses:=== | |||
* Variable resource input favors different agent traits than reliable inputs with the same mean value | |||
* Agents develop spatial variability to gather sparse resources | |||
* Unreliable resources favor cooperative strategies (Demetrius, e.g.) | |||
* Hubler's hypotheses: with little noise, the system minimizes dissipation and is efficient; with much noise, the system maximizes dissipation and is robust. | |||
===Papers:=== | |||
* [http://igitur-archive.library.uu.nl/milieu/2008-0111-200810/rietkerk-04-self%20organised.pdf Self-Organized Patchiness and Catastrophic Shifts in Ecosystems] | |||
* [http://www.nature.com/nature/journal/v405/n6783/pdf/405228a0.pdf The diversity-stability debate] | |||
* [[File: Reinterpreting Space, time lags, and functional response in ecological models.pdf]] | |||
* [[File: Ecology of Tropical Dry Forest.pdf]] | |||
* [[File: Mechanism of plant survival and mortality during drought.pdf]] | |||
* [[File: Ecophysiology of trees of seasonally dry tropics.pdf]] | |||
* [http://onlinelibrary.wiley.com/doi/10.1111/j.1461-0248.2009.01404.x/abstract Field theory for biogeography] | |||
==Contact: == | |||
maybe we need emails to facilitate communications. | |||
* Xiaoli: xiaolidong2008@gmail.com | |||
* Xue: xue.feng@duke.edu | |||
* Χλοε: chlewis (at berkeley edu) | |||
we are looking for the unknown X in Xeriscapes. | |||
Latest revision as of 17:57, 20 June 2012
Stochasticity and Space Project
Things we Need:
- Explicit hypotheses
- links to papers,
- state variables
- definitions of agent traits w.r.t. space variables,
- forcing conditions
- sample code?
Looks like we can do anything on a square grid in NetLogo, and even import GIS data.
Proposed:
State variables:
- Limiting resource (which can also be in excess)(E.g., water, nutrients)
- Patch/cell/region ability to conserve resource (E.g., soil organic matter)
- Patch connections (e.g., elevation -> horizontal flow)
- Connectivity (i.e. how well patches are connected)
Agent characteristics:
- Efficiency in capturing resource
- Efficiency in surviving low-resource conditions
- R-k strategy
- Spatial reach, for getting resource or spreading offspring
- Interactions? One kind of agent more efficient in the presence of another?
- Threshold responses to external inputs, or saturation
- What ecological processes does an agent do? (e.g. growth, water uptake, nutrient uptake, death, dispersal etc.)
Forcing conditions:
- Input of resource, variable in space or time
- Variance of input
Hypotheses:
- Variable resource input favors different agent traits than reliable inputs with the same mean value
- Agents develop spatial variability to gather sparse resources
- Unreliable resources favor cooperative strategies (Demetrius, e.g.)
- Hubler's hypotheses: with little noise, the system minimizes dissipation and is efficient; with much noise, the system maximizes dissipation and is robust.
Papers:
- Self-Organized Patchiness and Catastrophic Shifts in Ecosystems
- The diversity-stability debate
- File:Reinterpreting Space, time lags, and functional response in ecological models.pdf
- File:Ecology of Tropical Dry Forest.pdf
- File:Mechanism of plant survival and mortality during drought.pdf
- File:Ecophysiology of trees of seasonally dry tropics.pdf
- Field theory for biogeography
Contact:
maybe we need emails to facilitate communications.
- Xiaoli: xiaolidong2008@gmail.com
- Xue: xue.feng@duke.edu
- Χλοε: chlewis (at berkeley edu)
we are looking for the unknown X in Xeriscapes.