Resumo

TRUJILLO-C., William  e  HENAO-CARDENAS, María Mónica. Plant species richness and turnover in the Orinoco slope of the Andes in Colombia. Colomb. for. [online]. 2018, vol.21, n.1, pp.18-33. ISSN 0120-0739.  https://doi.org/10.14483/2256201x.11848.

The neutral theory proposes that the beta diversity is controlled by dispersal limitations and that the floristic similarity between communities is correlated with geographic distances. This work evaluated this hypothesis and compared the richness of Orinoco's subandine forests with forests in other slopes in Colombia, Ecuador and Peru. The Mantel test was used to evaluate the correlation between distance and floristic similarity in 19 plots of 0.1 ha and the Mann-Whitney test for a comparative richness analysis. We found that distance was a good predictor of floristic similarity, suggesting that dispersal limitations represent an important mechanism to explain species replacement. The richness found in the Orinoquia slope (47-84 species) was significantly lower than the Amazon and Pacific slopes of the Andes, but was similar to the one reported in the Magdalena slope. Finally, we found a similar plant species composition to that previously reported for Orinoquía.

Palavras-chave : riparian forest; terra firme forests; beta diversity; Orinoquia; floristic similarity..

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