Geographic Distributions of Plant Diversity in the Southeastern US

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Geographic Distributions of Plant Diversity in
the Southeastern US
Aaron Moody, Bob Peet, Todd Jobe, Jen Costanza,
Dahl Winters, Matt Simon NASA Biodiversity and
Ecological Forecasting Team Meeting May 1-2,
2008 NASA-NNG06GI70G
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Plot Data Nested Modules from 0.1 m to 0.1
ha Species by cover class Tree species by size
class
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Remote Sensing TM MODIS NPP Vegetation
indices Land Cover and Change Heterogeneity Fra
gmentation
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Question Does plant richness (a-diversity) vary
with productivity?How do these relationships
vary by functional type, community type,
ecoregion, extent, and sample scale?
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Question How does turnover in community
composition (ß-diversity) relate to environmental
gradients?How do these relationships vary by
functional type, community type, ecoregion, and
sample scale?
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Question What are the effects of landscape
heterogeneity and human land fragmentation on
richness
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Question How do species area z-values vary by
community type, ecoregion, and functional type?
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Productivity declines with latitude only for
forest interior plots
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Hump-shaped relationship between richness and
producitivity
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Change in richness with NPP is conditioned by
level of fragmentation
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Distance decay in similarity for trees
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Turnover along NPP gradient trees
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Richness declines with heterogeneity
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Plots with 5 or more Exotic Species
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Greatest change within 1km (515 plots)
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Plant Diversity and Productivity Structural
Equation Model
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Continuing work emphasizes Richness and
turnover analyses by functional type, community
type, and ecoregion Multi-scale
analyses Analysis of species-area z-values
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Thank You