Asteraceae Dumort. nos campos rupestres do Parque Estadual do Itacolomi, Minas Gerais, Brasil

• Autor(a) principal: Almeida, Gracineide Selma Santos de
• Data de Publicação: 2008
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/348
• topic: Taxonomia; Distribuiçãogeográfica; Similaridade florística; Asteraceae; Taxonomy; Geographical distribution; Floristic similarity; Asteraceae; CNPQ::CIENCIAS BIOLOGICAS::BOTANICA::TAXONOMIA VEGETAL::TAXONOMIA DE FANEROGAMOS

This work consisted of the floristic and taxonomic survey of Asteraceae in the rocky fields (Campos rupestres) of the Itacolomi State Park (ISP), located in the municipal districts of Ouro Preto and Mariana in Minas Gerais, as well as the analysis of geographical distribution patterns of and floristic similarity with other areas of rocky fields in the Espinhaço Range. The survey was carried out from August/2005 to December/2007, by monthly visits to 10 preset trails, covering all the phytophysiognomy of rocky fields in the region. The collected samples were deposited in the Herbarium of Federal University of Viçosa (VIC). The Asteraceae family was represented in the study area by 224 taxons comprising 219 species and 5 varieties, belonging to 56 genera and 11 tribes. The three subfamilies Barnadesioideae (1 genus), Cichorioideae (15) and Asterioideae (40) were also represented. The most diverse tribes were Eupatorieae (78 spp.), Vernonieae (38 spp.) and Astereae (38 spp.). The most representative genera were Eupatorium (38 spp.), Baccharis (29 spp.) and Vernonia (27 spp.). Three new species were discovered, Eupatorium sp.nov., Mikania sp. nov. and Stevia sp.nov., belonging to the tribe Eupatorieae. These results make the Itacolomi State Park the area of rocky field in Brazil with the largest number of Asteraceae species. The analysis of geographical distribution showed that 69.2% of taxons are restricted to the Brazilian territory, predominant in the pattern Atlantic southeast-south Brazil and Atlantic southeast Brazil. The floristic composition of the Itacolomi State Park showed correlation with the other rocky field areas of the Espinhaço Range, with influence of floristic elements from the Cerrado and the Atlantic Forest, represented by 72.8% of generalist elements. The specialist elements correspond to 61 taxons that are restricted to the rocky fields of the Espinhaço Range and/or the adjacent areas of Goiás, Mato Grosso and Pará. Regional endemism is represented by 40.6% of taxons restricted to Brazil, of these 20.6% are restricted to Minas Gerais, and 1.9% are endemic to ISP. The similarity analysis grouped ISP with Cipó Range at the level 0.35 of the Sorensen scale, which was justified by the geographical position and similar influence of the Atlantic Domain on the floristic composition of both areas. The systematic treatment of the sampled tribes, the geographical distribution and the ISP floristic similarity with the other areas of rocky field in the Espinhaço Range and the taxonomic description of the three new taxons for science are presented in form of scientific articles.