simulating plant community dynamics
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Simulating Plant Community Dynamics. Processes of plant communities - Competition - Facilitation - Mutualism - Resilience. Temporal Components - Climax Communities - Stable States - Dynamic Equilibrium. Spatial Components - PowerPoint PPT PresentationTRANSCRIPT
Simulating Plant Community Dynamics
Processes of plant communities - Competition - Facilitation - Mutualism - Resilience
Simulating Plant Community Dynamics
Temporal Components - Climax Communities - Stable States - Dynamic Equilibrium
D’Odorico et al. Global desertification: Drivers and feedbacks..
www.nature.comPlatt W.J. 1994.
Simulating Plant Community Dynamics
Spatial Components - Environmental filters - Local interactions - Distributions - Biodiversity
http://www.saguaro-juniper.com/i_and_i/san_pedro/ecoregions/plant_distribution.html
Konza LTER
http://aknhp.uaa.alaska.edu/botany/rare-plant-species-information/
Simulating Plant Community Dynamics
Experimental Design - Rarely includes spatial data - Small scale plots - Sessile organisms – long timescale
University of Houston: mobile ecosystems
Cedar Creek, MN. LTER.
Simulating Plant Community Dynamics
Simulated Data - Test hypotheses - Suggest future experiments
Two Methods Discussed - Cellular Automata -Point process model simulation
Parrott. 2004
Silvertown. 1996.
Colosanti & Hunt. 2004..
Levin. 1997..
Common Model Frameworks - Probabilistic - Mechanistic - Phenomenological
Simulating Plant Community Dynamics
Cellular Automata
Simulating Plant Community Dynamics
Cellular Automata: GAMA - Four main sections
The Ruderal functional group (green) can be thought of as simulating the performance of annual species.
Competitors (blue) and Stress tolerators (red) can be thought of as simulating perennial species.
Typically, annuals are outcompeted by perennials.
However, at a certain level of fecundity (~200 offspring), annual are able to coexist.
Simulating Plant Community Dynamics
Cellular Automata - Simulated dynamics - Numerous scenarios - Simple rule-based simulations
Simulating Plant Community Dynamics
Point process model simulation - spatstat package in R - Point patterns - Create, refine, plot - Correlations and Marks - Point process models - Poisson models - Random patterns & spatial trends
spatstat generated random patterns.
Field data.
Field data.
Simulating Plant Community Dynamics
Density and Intensity Analysis - Spatial analysis of densities (intensity) - Fit point patterns to models - Analyze performance
Smoothed residuals plot.
Relative density by plant type.
3D Density plots.
Envelope plot
3D density plot.
References