Paper Presentation – Soil Resources and Topography Shape Local Tree Community Structure in Tropical Forests – Methods and Results
Paper Presentation – Soil Resources and Topography Shape Local Tree Community Structure in Tropical Forests – Methods and Results
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PaperPresentation
On Github nthnjustice / PaperPresentation
Paper Presentation
Soil Resources and Topography Shape Local Tree Community Structure in Tropical Forests
Baldeck C, et. al
Jessica Dabrowski and Nathan Justice
Context
Community Composition and Structure
- Niche-assemply Processes
- Habitat Filtering
- Dispersal Limitation
- topography used to represent environmental influences
- Tropical Tree Study
- What remains to be addressed?
- breaking from (spatial) topography
- dissecting "environmental variables" for investigation
Focus and Findings of the Study
Combining Topography and Soil Resource Variation
- better representation of the environment's influence on local tree community structure
- soil variable explained more variation than topography in 7 of 8 sites
- soil variation added to topography doubled the proportion of variation due to environmental variables
Habitat Filtering is More Important than Dispersal
Methods and Results
Partitioning and Permutation
Universe: a, b, c, d, e, f, g
total = the proportion of variation explained by all spatial and evironmental variables combined (a+b+c+d+e+f+g)
space = the proportion explained by spatial variables (a+d+f+g)
env. = the proportion explained by environmental variables (b+c+d+e+f+g)
space|env. = the pure spatial component (a)
space&env. = the spatially structured environmental component (d+f+g)
env.|space = the pure environmental component (b+c+e)
soil = the proportion explained by soil variables (b+d+e+g)
topo. = the proportion explained by topographic variables (c+e+f+g)
soil|topo. = the proportion explained by soil after accounting for topography (b+d)
soil&topo. = the topographically structured soil component (e+g)
topo.|soil = the proportion explained by topography after accounting for soil (c+f)
Further Questions
The 'Unknowns:'
- How does soil moisture and drainage affect community structure?
- How does light affects community structure?
- How do species' responses to environmental variables affect variation in the community?