Levantamento da vegetação das Ilhas Itapuamas (Tapuamas), Baía de Guanabara, Rio de Janeiro

Andrade, J. R. C.; Neves, Léa de Jesus; Costa, José Augusto F. da

doi:10.1590/2175-78601985376304

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“…Studies about inselbergs situated on the Brazilian Shield are rare (e.g. Martinelli, 1984; de Andrade, de Jesus Neves & da Costa, 1985; Carauta & Ribeiro de Oliveira, 1984), however, it is well accepted (e.g. by Smith & Ayensu, 1976; Taylor, 1991; Zappi, 1994) that they form focal points of particular adaptive strategies (e.g.…”

Section: Introductionmentioning

confidence: 99%

Diversity and ecology of saxicolous vegetation mats on inselbergs in the Brazilian Atlantic rainforest

Porembski

Martinelli

Ohlemüller

et al. 1998

Diversity and Distributions

156

114

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Inselbergs occur as mostly dome-shaped diversity mats on West African inselbergs, the Brazilian rock outcrops bear a floristically more diverse mat rock outcrops in all climatic and vegetational zones of the tropics. Consisting of Precambrian granites and community rich in endemics. Thus the edaphically controlled inselberg vegetation reflects the outstanding gneisses, they form ancient and stable landscape elements. Due to harsh edaphic and microclimatic diversity of the Mata Atlântica. Possibly the high species richness of mats on East Brazilian inselbergs is conditions, the vegetation of inselbergs differs markedly from those of the surroundings. Monocotyledonous a consequence of a large species-pool. The processes that regulate regional and local diversity in the Mata mats form one of the most characteristic communities of this ecosystem. The floristic composition of this Atlântica are not fully clear. It is assumed that historical (i.e. long-term stability) and biotic (i.e. evolutionary community was studied on six inselbergs located in the Brazilian Atlantic rainforest. Dominating are interchange of taxa between canopies and rock outcrops followed by differentiation of local Bromeliaceae (Alcantarea, Encholirium), Velloziaceae (Vellozia), Cactaceae (Coleocephalocereus) and the populations) conditions have promoted high rates of speciation and their coexistence in isolated habitats. A Cyperaceae Trilepis. The alpha diversity of the mats was relatively uniform among the six outcrops.danger to the unique vegetation of East Brazilian inselbergs is the establishment of invasive weeds. However, beta diversity varied considerably between the different sites. Beta diversity was highest at the most speciose locality indicating a high degree of

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