Scales R10 R30 R50 k(FNBD) Effective Species Number RDA 1 25.90% 45.90% 64.10% 4.5 149 22.54% 2 19.50% 34.10% 48.20% 7.28 150 33.82% 4 13.20% 26.40% 35.00% 5.5 150 47.42% 8 0.00% 14.10% 23.60% 11.6 150 58.87%

Table 1: Patterns of rarity (R10, R30, R50) and aggregation ( k ) of species in Barro Colorado Island (BCI) tree community and explained variation for space using RDA when the spatial resolutions rise up (area size of smallest sampling quadrate is increasing with the scale parameter). Effective species number indicated the species with distributions that can be used for estimating aggregation parameter k .