Floristic diversity of two crystalline rocky outcrops in the Brazilian northeast semi-arid region

Gomes, Paulo R.; Alves, Marccus

doi:10.1590/s0100-84042010000400014

Cited by 33 publications

(35 citation statements)

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“…Some studies of rock outcrops in Brazil found phanerophytes and/or hemicryptophytes to be predominant (Safford & Martinelli 2000;Caiafa & Silva 2005;Ribeiro et al 2007;Gomes & Alves 2010), while others exhibited a greater proportion of chamaephytes (Porembski et al 1998;Conceição & Giulietti 2002;Conceição et al 2007) and terophytes (Gomes & Sobral-Leite 2013). The large number of phanerophytes found in the present study may be due to the geomorphology of the studied inselberg, which is comprised of many depressions.…”

Section: Discussionsupporting

confidence: 40%

Floristic and ecological characterization of habitat types on an inselberg in Minas Gerais, southeastern Brazil

et al. 2017

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Inselbergs are granitic or gneissic rock outcrops, distributed mainly in tropical and subtropical regions. Th ey are considered terrestrial islands because of their strong spatial and ecological isolation, thus harboring a set of distinct plant communities that diff er from the surrounding matrix. In Brazil, inselbergs scattered in the Atlantic Forest contain unusually high levels of plant species richness and endemism. Th is study aimed to inventory species of vascular plants and to describe the main habitat types found on an inselberg located in the state of Minas Gerais, in southeastern Brazil. A total of 89 species of vascular plants were recorded (belonging to 37 families), of which six were new to science. Th e richest family was Bromeliaceae (10 spp.), followed by Cyperaceae (seven spp.), Orchidaceae and Poaceae (six spp. each). Life forms were distributed in diff erent proportions between habitats, which suggested distinct microenvironments on the inselberg. In general, habitats under similar environmental stress shared common species and life-form proportions. We argue that fl oristic inventories are still necessary for the development of conservation strategies and management of the unique vegetation on inselbergs in Brazil.

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Section: Discussionsupporting

confidence: 40%

Floristic and ecological characterization of habitat types on an inselberg in Minas Gerais, southeastern Brazil

et al. 2017

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“…Esgario et al (2009) also found a great richness of Orchidaceae for montane inselbergs in the midwest of ES. Orchidaceae family represents one of the principal floristic elements of inselbergs of northeastern Brazil, with high levels of endemism (Porembski et al1998;França et al 2006;Gomes & Alves 2010;Pessoa & Alves 2014). In both areas, the montane or cloud inselbergs, a favorable environmental factor, such as presence of continuous or intermittent clouds, responsible for horizontal precipitation, seems to be the main reason for this richness, as observed for other groups of xeric environments such as vascular epiphytes (Nieder et al 2001).…”

Section: Discussionmentioning

confidence: 97%

Floristic composition of a Neotropical inselberg from Espírito Santo state, Brazil: an important area for conservation

Couto¹,

Francisco²,

Manhães³

et al. 2017

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Our study on granitic and gneissic rock outcrops on Pedra dos Pontões in Espírito Santo state contributes to the knowledge of the vascular flora of inselbergs in southeastern Brazil. We registered 211 species distributed among 51 families and 130 genera. Orchidaceae, Bromeliaceae and Polypodiaceae were the most representative families. Concerning vegetative habit, herbs were predominant and about the preference for substrates, holorupicolous species and epiphytes were most speciose. The richest rocky habitat type was woody thicket, with 122 exclusive species. In total, 27 of the species registered in our study are cited on official lists of endangered plant species from Espírito Santo state and Brazil. In addition, two new records of angiosperms for Espírito Santo flora and two new species were recorded for the area. Our data demonstrates the importance of the area for conservation of unique biodiversity that serves as a sanctuary for a rich rupicolous flora composed of endemic and endangered species, some of which are new to science.

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“…As leguminosas frequentemente aparecem em destaque em inventários de caatingas, seja em formações sobre embasamento cristalino (Costa et al 2009;Lima 2012;, substrato arenoso derivado da bacia sedimentar (Rocha et al 2004), ou em áreas com predominância de afloramento rochoso (Araújo et al 2008;Gomes & Alves 2010), como também em levantamentos restritos ao componente arbustivoarbóreo (Lemos & Rodal 2002) e nos que incluem os demais hábitos (Alcoforado-Filho et al 2003;Costa et al 2007;Costa et al 2009;. Neste trabalho, as coletas resultaram em um acréscimo de 25 espécies e 21 gêneros à listagem de Leguminosae nas caatingas de Tucano (Cardoso & Queiroz 2007).…”

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Variações locais na riqueza florística em duas ecorregiões de caatinga

et al. 2015

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A vegetação de caatinga do nordeste brasileiro ocorre principalmente sobre dois tipos de substrato principais: sobre solos derivados do embasamento cristalino pré-cambriano e sobre a cobertura arenosa das bacias sedimentares. Evidências recentes têm demonstrado variações na dinâmica, estrutura e composição florística da caatinga desses dois macroambientes, o que fundamenta a necessidade de estudos com enfoque nas diferenças florísticas entre esses diferentes substratos. O presente estudo florístico das ecorregiões de caatinga, Depressão Sertaneja Meridional e Raso da Catarina, no município de Tucano, Bahia, é de especial interesse porque neste município ocorrem esses dois substratos em escala geográfica local, permitindo ampliar o conhecimento sobre a heterogeneidade do Domínio da Caatinga. Neste trabalho é apresentado um inventário florístico de 14 localidades nestas duas ecorregiões da Caatinga. Em conjunto, as caatingas amostradas apresentaram uma alta riqueza florística em comparação com outras áreas no nordeste do Brasil. Foram coletadas 450 espécies, 288 gêneros e 82 famílias. A maior riqueza em espécies foi das Leguminosae, seguida por Euphorbiaceae. Nas localidades sobre substrato derivado do embasamento cristalino ocorreram 226 espécies, enquanto nas de substrato arenoso ocorreram 284 espécies. A proporção de espécies em comum entre esses dois tipos de substrato foi de apenas 13%. Diferenças em composição florística reforçam a hipótese de duas biotas distintas associadas aos dois principais tipos de substrato, que compõem a vegetação da caatinga. Palavras-chave: floresta sazonalmente seca, Depressão Sertaneja Meridional, Raso da Catarina, semiárido brasileiro. AbstractThe caatinga vegetation of northeastern Brazil occurs mainly in Pre-Cambrian, crystalline-derived soils and also on sedimentary-basin-derived sandy soils. Recent evidence has shown variations in the dynamics, structure and floristic composition of the caatinga over these two different edaphic macro-environments, which justifies the need for studies focusing on different substrates. A floristic study of the caatinga ecoregions Depressão Sertaneja Meridional and Raso da Catarina in the municipality of Tucano, Bahia, Brazil, is of special interest because both substrates occur in a local scale, allowing the opportunity to broaden our knowledge on ecological heterogeneity within the Caatinga biome. In the current study we carried out a floristic survey of 14 sites distributed throughout the ecoregions of caatinga in Tucano. We found high species diversity in the caatingas of Tucano when compared to other areas in northeastern Brazil. A total of 450 species, 288 genera, and 82 families were collected. The most species rich families are Leguminosae and Euphorbiaceae. There occur 226 species in the sites on crystalline basement, whereas 284 species were collected in the sandy areas. The ecoregions were only 13% similar in floristic composition. We found strong differences between the ecoregions with respect to floristic composition and predominan...

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Floristic diversity of two crystalline rocky outcrops in the Brazilian northeast semi-arid region

Cited by 33 publications

References 34 publications

Floristic and ecological characterization of habitat types on an inselberg in Minas Gerais, southeastern Brazil

Floristic and ecological characterization of habitat types on an inselberg in Minas Gerais, southeastern Brazil

Floristic composition of a Neotropical inselberg from Espírito Santo state, Brazil: an important area for conservation

Variações locais na riqueza florística em duas ecorregiões de caatinga

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