Table 2. Species richness, expressed as number of species per square meter, and density, expressed as number of individuals per square meter, in three different size classes of plants at different distances from remnant trees at the burned site (n = 10) and the crater site (n = 10) in the Tafua Rain Forest Preserve, Samoa. Mean is ± 1 SE.

Species
richness
Distance from trees (m)
Mean species
richness‡
Inside canopy
Outside canopy
0†
5
10
15
20
Burned site
size class:
< 1 cm
0.54 ± 0.04**
0.52 ± 0.11
0.36 ± 0.06
0.33 ± 0.04
0.32 ± 0.06
0.41 ± 0.05
1 < 5 cm
0.14 ± 0.02*
0.19 ± 0.02
0.23 ± 0.03
0.23 ± 0.03
0.21 ± 0.03
0.19 ± 0.03
5 < 20 cm
0.11 ± 0.02
0.13 ± 0.02
0.16 ± 0.03
0.14 ± 0.02
0.18 ± 0.02
0.14 ± 0.01
Crater site
size class:
< 1 cm
0.70 ± 0.09
0.93 ± 0.16
0.79 ± 0.11
0.74 ± 0.13
0.73 ± 0.13
0.78 ± 0.04***
1 < 5 cm
0.19 ± 0.03
0.27 ± 0.05
0.31 ± 0.03
0.27 ± 0.01
0.14 ± 0.03
0.24 ± 0.03
5 < 20 cm
0.07 ± 0.01
0.10 ± 0.01
0.10 ± 0.01
0.06 ± 0.01
0.06 ± 0.01
0.08 ± 0.01
Plant density
Distance from trees (m)
Mean plant
density‡
Inside canopy
Outside canopy
0†
5
10
15
20
Burned site
size class:
< 1 cm
1.42 ± 0.19***
0.96 ± 0.23
0.63 ± 0.14
0.55 ± 0.11
0.58 ± 0.131
0.83 ± 0.17
1 < 5 cm
0.19 ± 0.05
0.21 ± 0.04
0.31 ± 0.06
0.29 ± 0.05
0.26 ± 0.07
0.25 ± 0.02
5 < 20 cm
0.16 ± 0.03
0.20 ± 0.04
0.21 ± 0.05
0.17 ± 0.05
0.23 ± 0.04
0.19 ± 0.01***
Crater site
size class:
< 1 cm
2.79 ± 0.59
4.01 ± 0.76
2.51 ± 0.56
2.12 ± 0.41
2.05 ± 0.59
2.70 ± 0.35***
1 < 5 cm
0.24 ± 0.01
0.47 ± 0.01
0.46 ± 0.01
0.29 ± 0.01
0.18 ± 0.01
0.32 ± 0.06
5 < 20 cm
0.09 ± 0.01
0.14 ± 0.01
0.08 ± 0.01
0.05 ± 0.01
0.05 ± 0.01
0.08 ± 0.02

†Test of difference in species richness or plant density comparing samples from inside the canopies with pooled samples from outside the canopies (Mann-Whitney U-test). *** = P < 0.001, **= P < 0.01, * = P ~ 0.05.

‡Test of differences among sites for each size class (ANOVA), *** = P < 0.001.