This paper deals with the composition and structure of a pristine tropical rainforest using likelihood patterns to compare it with other Amazonian sites. This work was carried out in Alta Floresta, Mato Grosso. Our ground truth was obtained from a two-hectare plot, which was divided into 20 plots of 10 by 100 m each. In each plot, all trees with dbh = 10 cm were recorded. To evaluate the level of similarity between the Alta Floresta and other nine Amazonian sites we used the hierarchy clustering method linked by group means (UPGMA) through Sorensen index (qualitative). For ordination, we used the same method based on multidimensional non-metric scaling (NMS) through Jaccard index applied to presence or absence of botanical families or genera. The software PATN was used to run Mantel test with Jaccard index, which was, in turn, used for the similarity analysis among sites. The studied site presented 1,101 individuals distributed in 32 botanical families, 54 genera e 68 species. The richest family was Leguminosae. Helicostilys podogyne and Cecropia sp. were the most important species of the studied area. The Alta Floresta site did not present any similarity when compared to other Amazonian sites.
Floristic composition; Structure; Similarity; Amazonian mato-grossense; Alta Floresta
