Ecological Archives M073-001-A1

Martin F. Quigley and William J. Platt. 2003. Composition and structure of seasonally deciduous forests in the Americas. Ecological Monographs 73:87–106.

Appendix A. Split-plot ANOVA of the effects of latitude and category on plant density measured as the square root of number per 0.0625 ha.

Source   df Mean Square F P
Latitude   4 440.04 18.15 0.0079*
(40o + 30o) × (20o + 10o + 0o) 1 1222.71 50.44 0.0021*
40o × 30o 1 0.03 0 0.9729
20o × (10o + 0o) 1 246.32 10.67 0.0333*
10o × 0o 1 58.02 2.39 1.1967
Site (Latitude)   4 24.24 6.42 0.0001*
           
Plot (Site (Latitude))   135 3.77 1.92 0.0001*
           
Category   3 1083.26 550.87 0.0001*
(1 + 2 + 3) × 4 1 1288.1 655.04 0.0001*
1 × (2 + 3) 1 1.88 0.096 0.3281
2 × 3 1 1959.79 996.62 0.0001*
Latitude × Category 12 56.14 28.55 0.0001*
(40 + 30) vs. (20 + 10 + 0) × (1 + 2 + 3) vs.4 1 1.51 0.77 0.3817
(40 + 30) vs. (20 + 10 + 0) × 1 vs. (2 + 3) 1 7.2 3.66 0.0564
(40 + 30) vs. (20 + 10 + 0) × 2 vs. 3 1 181.8 92.45 0.0001*
40 vs. 30 × (1 + 2 + 3) vs. 4 1 74.33 37.8 0.0001*
40 vs. 30 × 1 vs. (2 + 3) 1 42.17 21.45 0.0001*
  40 vs. 30 × 2 vs. 3 1 1.5 0.76 0.2831
20 vs. (10 + 0) × (1 + 2 + 3) vs. 4 1 64.98 33.04 0.0001*
20 vs. (10 + 0) × 1 vs. (2 + 3) 1 20.03 10.18 0.0015*
20 vs. (10 + 0) × 2 vs. 3 1 58.85 29.93 0.0001*
10 vs. 0 × (1 + 2 + 3) vs. 4 1 113.24 57.58 0.0001*
10 vs. 0 × 1 vs. (2 + 3) 1 0.01 0 0.9535
10 vs. 0 × 2 vs. 3 1 12.21 6.21 0.0131*
Category × Plot (Site (Latitude)) 417 1.96    
           
Total   575      

   Notes: Main effect was square root of number per 1/16 ha. Main effect was latitude, with a split plot effect of site and a split-split plot effect of category. Latitude and categories were fixed; site and plot replicates were random. Category legend: (1) shrub layer; (2) subcanopy; (3) canopy; (4) liana. An asterisk denotes statistical significance at = 0.05; R2 = 0.89. The dependent variable was plant density.


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