Ecological Archives E096-068-A5
Stephen J. Murphy, Lívia D. Audino, James Whitacre, Jenalle L. Eck, John W. Wenzel, Simon A. Queensborough, and Liza S. Comita. 2015. Species associations structured by environment and land-use history promote beta-diversity in a temperate forest. Ecology 96:705–715. http://dx.doi.org/10.1890/14-0695.1
Appendix E. Significance of individual variables used in the variance partitioning model.
Table E. Amount of variation in species richness and community composition explained by individual predictor variables. Adjusted R-squared values were calculated using linear regression for species richness, and with redundancy analysis for community composition (P values were generated using a permutation procedure for composition).
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Richness |
Composition |
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Category |
Variable |
Type |
Min |
Max |
Mean |
R² |
P |
R² |
P |
Environment |
Elevation |
Continuous |
395.22 |
622.98 |
509.93 |
0.10 |
< 0.001 |
0.09 |
0.001 |
Slope |
Continuous |
1.50 |
23.70 |
7.94 |
0.01 |
0.085 |
0.03 |
0.001 |
|
Aspect |
Categorical |
— |
— |
— |
0.05 |
0.081 |
0.03 |
0.001 |
|
Convexity |
Continuous |
-128.07 |
134.03 |
-0.37 |
0.02 |
< 0.001 |
0.03 |
0.001 |
|
Soils |
Categorical |
— |
— |
— |
0.21 |
< 0.001 |
0.19 |
0.001 |
|
Distance to stream |
Continuous |
0.91 |
2006.53 |
675.22 |
0.09 |
< 0.001 |
0.06 |
0.001 |
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Forest age |
Ordinal |
<39 years |
> 106 years |
~ 100 years |
0.01 |
0.431 |
0.02 |
0.001 |
|
Land use type |
Categorical |
— |
— |
— |
0.06 |
< 0.001 |
0.03 |
0.001 |
|
Land use |
Proportion disturbed |
Continuous |
0.00 |
1.00 |
0.15 |
0.06 |
< 0.001 |
0.04 |
0.001 |
Distance to paved road |
Continuous |
0.17 |
1615.4 |
451.69 |
0.00 |
0.431 |
0.02 |
0.001 |
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Space |
PCNM Eigenvectors |
Continuous |
— |
— |
— |
0.45 |
<0.001 |
0.47 |
0.001 |