Plant diversity and community structure of Brazilian Páramos

作     者：Prímula Viana CAMPOS Pedro Manuel VILLA Jaquelina Alves NUNES Carlos E.G.R.SCHAEFER Stefan POREMBSKI Andreza Viana NERI prímula viana campos;pedro manuel villa;jaquelina alves nunes;carlos e.g.r.schaefer;stefan porembski;andreza viana neri

作者机构：Federal University of Vicosa Department of Plant Biology Laboratory of Ecology and Evolution of Plants Campus Universitdrio 36570-900 Vicosa Minas Gerais Brazil Foundation for the Conservation of Biodiversity 7101 Merida Venezuela Minas Gerais State University Rua dos estudantes 23 Santa Emilia 36800-000 Carangola Minas Gerais Brazil 4 Federal University of Vicosa Department of Soil Campus Universit（lrio 36570-900 Vicosa Minas Gerais Brazil 5 University of Rostock Institute of Bioseience Department of Botany Wismarsehe Str. 44/45 D-18051 Rostoek Germany 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2018年第15卷第6期

页      面：1186-1198页

核心收录：

学科分类：07[理学] 0713[理学-生态学] 

基　　金：Brazilian Coordination for the Improvement of Higher Education Personnel Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, CAPES Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq, (206814/2014-3) 

主　　题：Rock outcrops High altitude grasslands Species abundance distribution Species richness 

摘      要：In Eastern South America, high altitude grasslands represent a mountain system that has a high number of endemic species. However, studies on the ecology of plant communities in these environments remain scarce. We aimed to evaluate the patterns of biodiversity and structure of plant communities from rocky outcrops in high altitude grasslands of three areas at the Caparaó National Park, southeastern Brazil, by sampling 300 randomly distributed plots. Then, we compared the floristic composition, relative abundance, and biological and vegetation spectra among areas. We classified species as endemic and non-endemic and verified the occurrence of endangered species. Species richness was evaluated by rarefaction analysis on the sampling units. The importance value and species abundance distribution(SAD) models were assessed. We also performed an indicator species analysis. We sampled 58 species belonging to 49 genera and 32 families. The number of species decreased with increasing altitude, with significant differences being observed among areas regarding richness, abundance, and cover. Of the total number of species, 10 are endemic to the Caparaó National Park and 17 are listed on the Brazilian Red List of endangered species. The dominant families on all peaks were Asteraceae and Poaceae. The SAD models showed lognormal and geometric distributions, corroborating the fact that 10 species that were common to all three areas were also the most dominant ones in the communities and showed the highest importance values, which ranged between 35% and 60%. Indicator species analysis revealed that 28 species(48.27%) were indicators. Of these, 42.85% had maximum specificity, meaning that they occurred only in one area. Thus, the number of species per life form ratio was similar among areas, yet vegetation spectra differed, especially for hemicryptophytes. The altimetric difference among the areas showed to be a very important driver in the community assembly, influencing the evalu