A Comparison of the Structure and Composition of Montane and Lowland Tropical Forest in the Serranía Pilón Lajas, Beni, Bolivia Back to Main Page Table 1. The ten most important species in a one hectare permanent plot at the "Cumbre Pilón" in the Serranía Pilón Lajas, Beni Bolivia; the relative values are calculated as a percentage based on the summed values for all species for abundance, frequencies, and basal area; the importance value is a sum of the relative values. Species Abundance Frequency Basal area (cm2) Relative density Relative frequency Relative dominance Importance value Iriartea deltoidea 93 22 27,177 15.82 6.38 10.29 32.48 Pseudolmedia laevis 74 23 21,791 12.59 6.67 8.25 27.50 Poulsenia armata 24 15 22,981 4.08 4.35 8.70 17.13 Astrocaryum murumuru 37 21 8,653 6.29 6.09 3.28 15.66 Sorocea cf. pileata 31 19 8,880 5.27 5.51 3.36 14.14 Sapium marmierii 19 9 21,082 3.23 2.61 7.98 13.82 Hura crepitans 3 3 30,338 0.51 0.87 11.49 12.87 Euterpe precatoria 21 15 4,314 3.57 4.35 1.63 9.55 Celtis schippii 18 13 5,475 3.06 3.77 2.07 8.90 Inga tomentosa 17 11 4,060 2.89 3.19 1.54 7.62 Subtotals 337 151 154,752 57.31 43.79 58.59 159.67 Other species 310 195 109,317 42.69 56.99 41.41 140.33 Totals 588 345 264,067 100.00 100.00 100.00 300.00