Ecological Archives E092-056-A2

Jonathan A. Myers and Kyle E. Harms. 2011. Seed arrival and ecological filters interact to assemble high-diversity plant communities. Ecology 92:676–686.

Appendix A. ANOVA tables for biomass, soil moisture, species richness, and total density.

TABLE B1. Results from mixed-effects ANOVA testing for effects of local fire intensity and soil moisture on total aboveground plant biomass in Fall 2007 and soil volumetric water content (soil moisture) in Summer 2008. Soil water was analyzed at two depths (7.5 and 20 cm). P values < 0.05 are indicated in bold.

Variable df den df F P
Total biomass/0.25 m2        
Fire intensity 1 53 021.01 < 0.0001
Soil moisture 2 53 007.70 < 0.0012
Fire intensity × Soil moisture 2 53 000.54 < 0.5850
Soil moisture        
Fire intensity 1 53 000.16 < 0.6839
Soil moisture 2 53 586.32 < 0.0001
Depth 1 54 109.03 < 0.0001
Fire intensity × Soil moisture 2 53 000.75 < 0.4752
Fire intensity × Depth 1 54 000.77 < 0.3840
Soil moisture × Depth 2 54 097.91 < 0.0001
Fire intensity × Soil moisture × Depth 2 54 001.25 < 0.2936

TABLE B2. Results from mixed-effects ANOVA testing for effects of local fire intensity, soil moisture, seed arrival, and time on total species richness, seed-addition species richness, and total density of seed-addition species. Seed-addition species richness and density were analyzed using data only from seed-addition subplots because seed-addition species occurred infrequently in seed-control subplots. Seed-addition species richness was square-root transformed and total density was log10-transformed to normalize residuals. P values < 0.05 are indicated in bold.

Variable df den df F P
Total species richness        
Fire intensity 1 053 013.22 < 0.0006
Soil moisture 2 053 004.99 < 0.0103
Seed arrival 1 054 144.74 < 0.0001
Time 1 220 016.50 < 0.0001
Fire intensity × Soil moisture 1 053 001.84 < 0.1674
Fire intensity × Seed arrival 2 054 010.65 < 0.0019
Fire intensity × Time 2 220 045.20 < 0.0001
Soil moisture × Seed arrival 2 054 004.01 < 0.0238
Soil moisture × Time 4 220 001.67 < 0.1566
Seed arrival × Time 2 220 0.99 < 0.3721
Fire intensity × Soil moisture × Seed arrival 2 054 000.44 < 0.6442
Fire intensity × Soil moisture × Time 4 220 001.37 < 0.2446
Fire intensity × Seed arrival × Time 2 220 000.18 < 0.8316
Soil moisture × Seed arrival × Time 4 220 001.24 < 0.2914
Seed-addition species richness        
Fire intensity 1 053 006.75 < 0.0121
Soil moisture 2 053 0  9.75 < 0.0002
Time 2 108 0  3.55 < 0.0319
Fire intensity × Soil moisture 2 053 000.62 < 0.5393
Fire intensity × Time 2 108 005.35 < 0.0060
Soil moisture × Time 4 108 000.48 < 0.7447
Fire intensity × Soil moisture × Time 4 108 000.25 < 0.9041
Total density of seed-addition species        
Fire intensity 1 053 003.55 < 0.0650
Soil moisture 2 053 042.91 < 0.0001
Time 2 108 0  9.03 < 0.0002
Fire intensity × Soil moisture 2 053 000.15 < 0.8582
Fire intensity × Time 2 108 003.98 < 0.0214
Soil moisture × Time 4 108 001.46 < 0.2186
Fire intensity × Soil moisture × Time 4 108 000.18 < 0.9452

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