The Brazilian seasonal dry forest distributed in natural disjunctions in South America, are considered relict formations of a seasonal forest previously extensive and large contiguous piece that expanded during the dry climates of the Pleistocene period. Some of these formations are related to areas with outcrops of limestone rocks. The influence of historical climate fluctuations in the fragmentation and expansion of seasonal dry forest in South America is the subject of extensive debate, however, are rare floristic survey work carried out in areas with outcrops of limestone, being unpublished study compared this vegetation distinct phytogeographic domains. Through the collection of fertile botanical material, this study aims to know the species richness and floristic similarity relationship between areas of limestone outcroppings located in different phytogeographic domains. With the aid of predictive models of species distributions, evaluate whether temporal congruence between expansions or retractions in the amplitude of the potential geographical distribution of calcífilas species on the basis of historical climate oscillation events, and measure the relationship between areas designated for mineral exploration, and conservation of nature, located in climatic refuge areas these species. With the results, it is expected the richness of species and the floristic similarity relationship between areas of occurrence of plant communities of calcareous soil in different biomes, detailing the geographic distribution of typical species; support the understanding of past tenses processes of expansion and retraction of the vegetation cover in the interior of Brazil.
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