2937094 documents found, page 16244 of 293710
Floristic composition and community structure of a seasonally deciduous forest ...
Felfili,Jeanine M.; Nascimento,André R. Terra; Fagg,Christopher William; Meirelles,Elisa MariaThe objective of this study was to analyze the floristic composition and structure of the tree component in a seasonally deciduous forest on limestone outcrops, located in the northeast region of Goiás State, Brazil. A sample composed of 25 randomly sampled plots of 20 x 20 m (400 m²) within a 50 ha forest, was measured. All woody individuals > 5 cm diameter at breast height (DBH) had their diameter and height ...
Species composition and biogeographic relations of the rock outcrop flora on th...
Ribeiro,Kátia Torres; Medina,Branca Maria Opazo; Scarano,Fabio RubioWe studied the flora of vegetation islands on rock outcrops on the Itatiaia Plateau (22°21'S and 44°40'W), at 2,400 m.a.s.l. A total of 114 vascular plant species, which correspond to ca. 20%-25% of the currently inventoried flora of the plateau, were sampled in 197 small vegetation islands (total area of 0.034 ha). Xerophytes and hydrophytes were often found side by side due to environmental heterogeneity at a...
Floristics, structure and soil of insular vegetation in four quartzite-sandston...
Conceição,Abel Augusto; Pirani,José Rubens; Meirelles,Sergio TadeuSoil islands on rocky surfaces often harbor aggregated vegetation that consists of insular plant communities. These islands are typical of the rocky outcrops and in various parts of Brazil form the so-called "campos rupestres" vegetation. Four of such sites have been selected in the state of Bahia, Northeast Brazil, for this comparative study on floristics and vegetation structure: three areas situated inside t...
Structural analysis of the vegetation on a highland granitic rock outcrop in So...
Caiafa,Alessandra N.; Silva,Alexandre F. daGranitic rock outcrops of the Brazilian southeast are either coastal or inland. The latter can often have high altitudes, such as in the summits of "Serra do Mar" and "Serra da Mantiqueira", where they are known as "Campos de Altitude". The landscape on these high altitude plateaux is often a mosaic of shrubs and treelets within a bunchgrass matrix, with sparse pteridophytes and other herbs, interspersed with v...
The potential of natural regeneration of rocky outcrop vegetation on rupestrian...
Medina,Branca Maria Opazo; Fernandes,Geraldo WilsonAn area's innate potential to regenerate represents a crucial factor for its conservation and management. The seed rain and seed bank are important agents in the regeneration process. Seed banks are particularly important in communities where there is a high proportion of obligate seeders. Rocky outcrops are habitats where most part of the plant species depends on their seeds to reproduce and maintain viable po...
Clonal growth and dispersal potential of Leiothrix flagellaris Ruhland (Eriocau...
Figueira,José Eugênio Côrtes; Del Sarto,Mário César LaboissiérèLeiothrix flagellaris is a small clonal plant that grows in sandy/rocky, nutrient poor soils in the rocky grasslands ("campos rupestres") of southeastern Brazil. In the rainy season most of their flower heads differentiate into small rosettes, produced by pseudovivipary, and connected to the mother-plant by flexible, elongated stalks that can reach up to 90cm. Most of these rosettes remain suspended over rocks ...
Vegetative propagation strategies of four rupestrian species of Leiothrix (Erio...
Coelho,Flávia de Freitas; Capelo,Christina Dorvalina Lopes; Neves,Ana Carolina Oliveira; Figueira,José Eugênio CôrtesLeiothrix is endemic of South America and includes 37 species, 25 of which occur in the state of Minas Gerais. Nineteen of those occur in the "Serra do Cipó", a mountain chain, located in the southern portion of the Espinhaço mountain range. This study examines vegetative propagation strategies of four species of Leiothrix, endemic to the Minas Gerais portion of the Espinhaço mountain range. For each species we...
Leaf anatomy of two Anemia Sw. species (Schizaeaceae-Pteridophyte) from a rocky...
Ribeiro,Maria Luiza R. C.; Santos,Marcelo Guerra; Moraes,Moemy GomesThe ferns Anemia tomentosa (Sav.) Sw. var. anthriscifolia (Schrad.) Mickel and Anemia villosa Humb. & Bonpl. ex Willd. are widely associated with vegetation islands on rocky outcrops in Rio de Janeiro. Both species are desiccation tolerant. The leaf anatomy of these species was examined aiming to identify morphological characteristics that would allow the establishment of these species in water-scarce envir...
Water relations of tree species growing on a rock outcrop in the "Parque Estadu...
Silva,Luiz Gustavo Rabaioli da; Dillenburg,Lúcia RebelloWater relations of the tree species Myrsine umbellata Mart. ex A. DC., Dodonaea viscosa Jacq. and Erythroxylum argentinum O. E. Schulz, growing on a rock outcrop in the "Parque Estadual de Itapuã" (RS), were studied. Environmental (precipitation, temperature, soil water) and plant (water potential, vapor pressure deficit, stomatal conductance, transpiration, leaf specific hydraulic conductance, osmotic potentia...
Variation between three Eremanthus (Asteraceae) species in their ability to for...
Velten,Simone Batalha; Garcia,Queila SouzaKnowledge on seed bank function is fundamental for understanding the species regeneration patterns. This investigation was carried out to compare the ability of Eremanthus elaeagnus (Mart. ex DC.) Schultz-Bip, E. glomerulatus Less., and E. incanus (Less.) Less. to form a soil seed bank. Seeds (aquenes) of each of these three species were collected, stored in the laboratory and subsequently buried in the same ar...