Floristics, structure and soil of insular vegetation in four quartzite-sandstone outcrops of "Chapada Diamantina", Northeast Brazil

Conceição, Abel Augusto; Pirani, José Rubens; Meirelles, Sérgio Tadeu

doi:10.1590/s0100-84042007000400009

Cited by 60 publications

(47 citation statements)

References 27 publications

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“…In this case, the similarities of the environmental parameters were more important in the analyses than the geographical distances between the areas, as was also observed by Conceição et al (2007) in four areas of open rocky field vegetation in the Chapada Diamantina (Bahia State). These authors observed that the closest sites were not the most floristically similar, indicating that other factors more relevant than distance were involved in determining species compositions.…”

Section: Resultssupporting

confidence: 52%

The tree-shrub vegetation in rocky outcrop cerrado areas in Goiás State, Brazil

Santos¹,

Pinto²,

Lenza³

et al. 2012

Braz. J. Bot.

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-(The tree-shrub vegetation in rocky outcrop cerrado areas in Goiás State, Brazil). We describe the floristic composition of the tree-shrub vegetation in 10 areas of rocky outcrop cerrado in Goiás State, Brazil. Ten 20 × 50 m plots (totaling 1 ha) were established and all of the individuals with diameters at 30 cm above soil level (DB 30 ) ≥ 5 cm were included in the sampling. Comparative analyses of the flora were realized using similarity indices (Sørensen and Czekanowski), classification analysis (TWINSPAN), and the Mantel test. A total of 13,041 tree-shrub individuals were sampled, distributed among 219 species, 129 genera and 55 families. Fabaceae was the most well-represented family, followed by Myrtaceae, Melastomataceae, Vochysiaceae, Malphigiaceae, and Rubiaceae. Fully 42.3% of the comparisons evaluated by the Sørensen index were > 0.50, while all the values were < 0.50 for the Czekanowski index, with the exception of Jaraguá and Mara Rosa areas. The TWINSPAN classification generated four divisions and, in general, only the differences in the size of the population were responsible for the groupings. The Mantel test indicated that there was no relationship between floristic similarity and the distances between the areas (r = 0.32, P = 0.05). It therefore appears that the areas of rocky outcrop cerrado in Goiás State are relatively floristically homogeneous and that they are principally distinguished by the differences in the sizes of the populations of their dominant species, and the presence of exclusive species in certain areas.

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Section: Resultssupporting

confidence: 52%

The tree-shrub vegetation in rocky outcrop cerrado areas in Goiás State, Brazil

Santos¹,

Pinto²,

Lenza³

et al. 2012

Braz. J. Bot.

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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: 42%

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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“…The cryptophytes were restricted to the outcrop patches with deeper soils, due to their characteristic underground systems (see Raunkiaer 1934, Galán de Mera et al 1999. The small proportion of hemicryptophytes found is not in agreement with previous studies carried out in Brazil, where this group is generally well represented (Conceição & Pirani 2005, Ribeiro & Medina 2002, França et al 2005, Conceição et al 2007, Ribeiro et al 2007. Differently from the cryptophytes, species of this life form colonize patches of bare rock, as demonstrated by A. leptantha.…”

Section: Discussionmentioning

confidence: 71%

“…In this aspect, the biological spectrum of both areas was similar. Both areas presented a higher proportion of phanerophytes, as well as it occurs in other rock outcrops in Brazil (Meirelles et al 1999, Conceição & Giulietti 2002, Ribeiro & Medina 2002, Conceição & Pirani 2005, França et al 2005, Caiafa & Silva 2005, Conceição et al 2007, Ribeiro et al 2007, Araújo et al 2008. The phanerophytes are represented in the study areas by different growth forms, such as vines, shrubs and trees, and they occur preferentially in patches with deeper soil.…”

Section: Discussionmentioning

confidence: 73%

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

Gomes¹,

Alves²

2010

Rev. bras. Bot.

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-(Floristic diversity of two crystalline rocky outcrops in the Brazilian northeast semi-arid region). Floristic composition and structure of vegetation were studied in two rocky outcrop areas in the semi-arid region of northeastern Brazil. From April 2007 to September 2008, 18 monthly field trips were carried out. Vascular plants were randomly collected throughout the outcrop areas. For structural analysis, 30 plots of 1 × 1 m were set in the vegetation islands. The checklist presented combines 211 species (69 families and 168 genera), although only 56 species were collected in the plots. Fabaceae (18 spp.; 8.5%), Asteraceae (17 spp.; 8%), Orchidaceae (13 spp.; 6.1%), Euphorbiaceae (13 spp.; 6.1%), Bromeliaceae (10 spp.; 4.7%), and Poaceae (eight spp.; 3.8%) are the richest families. Overall, 1,792 shrub and herbaceous specimens were counted in the plots. The Shannon-Wiener (H) diversity index values were 2.572 and 2.547 nats individual -1 . The species that presented the highest absolute abundance values (number of plants) had low frequencies in the plots and vice-versa. The biological spectrum had a high proportion of phanerophytes and therophytes, followed by cryptophytes, chamaephytes, and hemicryptophytes. The studied flora shares floristic components similar to other rocky outcrop areas of the semi-arid region in northeastern Brazil, including in relation to dominant groups in the vegetation structure.Key words -Caatinga, inselbergs, life-forms, saxicolous plants RESUMO -(Diversidade florística de dois afloramentos rochosos cristalinos no semi-árido, nordeste do Brasil).Composição florística e estrutura da vegetação foram estudadas em dois afloramentos rochosos localizados no semi-árido do nordeste do Brasil. Foram realizadas 18 excursões mensais, de abril de 2007 a setembro de 2008. Plantas vasculares foram coletadas aleatoriamente, no afloramento como um todo. Para análise estrutural foram plotadas 30 parcelas de 1 × 1 m nas ilhas de vegetação. Foram encontradas 211 espécies (69 famílias e 168 gêneros), entretanto somente 56 espécies foram coletadas nas parcelas. As famílias com maior número de espécies foram Fabaceae (18 spp.; 9%), Asteraceae (17 spp.; 8,5%), Orchidaceae (13 spp.; 6,5%), Euphorbiaceae (13 spp.; 6,5%), Bromeliaceae (10 spp.; 5%) e Poaceae (oito spp.; 4%). Ao todo, foram contabilizados, nas parcelas, 1.792 indivíduos herbáceos e arbustivos. Os valores do índice de diversidade de Shannon-Wiener (H) foram de 2,572 e 2,547 nats ind.-1 . As espécies que apresentaram maiores densidade apresentaram baixa freqüência nas parcelas e vice-versa. O espectro biológico apresentou alta proporção de fanerófitos e terófitos, seguidos por criptófitos, caméfitos e hemi-criptófitos. A flora estudada compartilha conjunto florístico semelhante a outros afloramentos rochosos do Nordeste do Brasil, inclusive em termos de grupos dominantes na estrutura da vegetação.Palavras-chave -Caatinga, formas de vida, inselbergues, plantas saxícolas 1.

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Floristics, structure and soil of insular vegetation in four quartzite-sandstone outcrops of "Chapada Diamantina", Northeast Brazil

Cited by 60 publications

References 27 publications

The tree-shrub vegetation in rocky outcrop cerrado areas in Goiás State, Brazil

The tree-shrub vegetation in rocky outcrop cerrado areas in Goiás State, Brazil

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

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

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