Abstract
In South America, the largest area of tropical savanna is the Brazilian Cerrado biome, which encompasses a considerable range of environmental variation, with different types of soil, geology, geomorphology and climate, as well as distinct types of vegetation. These savannas include two types of vegetation: one on hilly slopes, with relatively shallow interspersed with rocky soils (RS), known as Rocky Cerrado, and the other located on flat terrain with deep soils (DS), known as Typical Cerrado. Our objective was to evaluate the effects of the heterogeneity of the chemical and granulometric properties of the soils on the composition and diversity of the shrubby–arboreal strata of the RS and DS. We found that, despite the reduced abundance of woody plants in the RS, and the physical limitations on plant development imposed by the rocky outcrops found in this environment, the RS is characterized by similar species diversity to that found in the DS. We present evidence of greater heterogeneity in the species composition and edaphic proprieties of the RS in comparison with the DS. We conclude that the greater variation and heterogeneity in the substrates of the RS accounts for the similarity in the species diversity between the RS and DS, although we suspect that other drivers, not investigated here, may also be involved. The intense conversion of native vegetation within the study region interferes with the establishment of exclusive species in RS (e.g., Norantea guianensis Aubl.) and DS (e.g., Couepia grandiflora (Mart. & Zucc.) Benth.) and consequently threatens the community structure of both environments with fundamental implications for the conservation.
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Acknowledgements
We are grateful to the UNEMAT Graduate Program in Ecology and Conservation and the Brazilian Higher Education Training Program (CAPES) for financial support and the concession of a graduate scholarship. We are grateful to the projects ‘Tropical Biomes in Transition—TROBIT’; Science without Borders Program/CAPES (Project 177/2012); PELD/CNPq (Long-Term Ecological Studies); and PROCAD UnB/UNEMAT (Project 109/2007) for financial and logistic support during the fieldworks. We are grateful to Mr. L. Rotta, Darci and Manoel, and we thank also the owners of the farm Santa Marta, where this study was conducted. We would also like to thank the taxonomists C. E. Proença and J. E. Q. de Faria Júnior for the identification of the species. Furthermore, we thank Daiana Cardoso, Letícia Silva, Leandro Brasil and Josias dos Santos who helped with data collection.
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Abadia, A.C., Lenza, E., Mews, H.A. et al. Savannas on two different substrates in Brazil have a similar species diversity, but distinct edaphic conditions and species composition. Braz. J. Bot 41, 57–64 (2018). https://doi.org/10.1007/s40415-017-0424-x
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DOI: https://doi.org/10.1007/s40415-017-0424-x