Inclusion of ecologically based trait variation in plant ...
Ecological response models: part 1 - overviewpart 1 - overview . Approaches to vulnerability...
Transcript of Ecological response models: part 1 - overviewpart 1 - overview . Approaches to vulnerability...
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Ecological response models: part 1 - overview
Approaches to vulnerability assessment
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Scale
Scope
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What approach do we take, and at what scale?
• Action plans should be use the best information – Qualitative assessment – Experimentation – Models
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• WHY are you modeling? • WHAT are you modeling? • HOW are you modeling?
Considerations for Ecological Response Models
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WHY are you modeling?
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• Target • Genes, species, ecosystems • Primary productivity • Mass balance • Nutrient flow
• Context • Spatial and temporal aspects of input and
output • Factors and interactions included
WHAT are you modeling?
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HOW are you modeling it?
• Data sources • Experiments, experts, observations, paleo
• Model type
• Conceptual • Correlative/phenomenological • Mechanistic
• Deterministic vs. stochastic • Physiological, biogeochemical, etc. • Rule-based, agent-based, trait-based • Bayesian
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Types of ecological response models
• Conceptual models • Expert opinion models • General characterization models • Habitat or occupancy models • Vegetation/habitat response models • Physiologically based models • Ecological models
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Conceptual models
Figure taken from Heemskerk et al. 2003 – Ecology and Society
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Expert opinion models
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General characterization models
Lavorel et al. 1997 – Trends in Ecology & Evolution
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General characterization models
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Habitat and occupancy models (aka distribution models)
• A rose by any other name… – Ecological niche modeling – Element distribution modeling – Predictive range mapping – Habitat suitability modeling – Climate envelope modeling
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Habitat and occupancy models (aka distribution models)
GIS layers Precipitation Temperature Wind speed Humidity
Current habitat suitability
Presence or presence/absence data
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Habitat and occupancy models (aka distribution models)
GIS layers Precipitation Temperature Wind speed Humidity
Current habitat suitability
Presence or presence/absence data
Habitat suitability in 2050
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Habitat and occupancy models (aka distribution models)
Exposure can be assessed in a quantitative and spatially explicit manner
Current suitability Suitability in 2050
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Wiens J A et al. PNAS 2009;106:19729-19736
Understanding model assumptions
Modeled current and future distributions of wrentit and rufous-crowned sparrow in California
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Vegetation/habitat response models
• Species distribution models • GAP models • Landscape models • Biogeochemical models • Dynamic global vegetation models
Robinson et al. 2008. Vegetation models and climate change: Workshop Results.
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Dynamic vegetation models
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Physiologically based models
Figure taken from Kearney and Porter 2009 – Ecology Letters
Can be a variant of distribution models
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Ecological models
Simulates C, N, P, and S dynamics through an annual cycle over time scales of centuries and millennia
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From Bellard et al. 2012. Ecology Letters.
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Which model is best for my needs?
• What data are available? • What’s your timeline, expertise, and
budget? • What output do you need to meet your
objectives (e.g. making a decision, understanding system function, etc.)
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Current
Overlap
Future
What would you do?