Abstract

SOTO-MEDINA, Edier; JIMENEZ, Angela  and  ZULUAGA, Alejandro. Island Biogeography of Dry Forest Relict of the Cauca River Geographical Valley (Colombia). Colomb. for. [online]. 2023, vol.26, n.2, pp.15-28.  Epub July 30, 2023. ISSN 0120-0739.  https://doi.org/10.14483/2256201x.19858.

This study analyzed the relationships between species-area richness and phylogenetic diversity-area in the relict flora of the tropical dry forest in the Cauca River valley in Colombia, using a species list from 38 relict sites. The results showed that plant richness followed the species-area relationship (SAR) model, albeit with steeper slopes than expected for habitat islands, and that species dispersion affected the SAR model. Additionally, plant communities showed a nested pattern. Climate did not influence plant richness, but it did affect species composition. Phylogenetic diversity was not related to area, but phylogenetic clustering increased with it. As a conclusion, dispersion limitation is the factor that structures plant richness in tropical dry forest relicts.

Keywords : fragmentation; species-area relation- ship (SAR); phylogenetics; conservation; tropical dry forest..

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