Shrublands
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Taxonomy of Sinningia Nees (Gesneriaceae) in Rio Grande do Sul, southern Brazil
ABSTRACTThe genus Sinningia belongs to the Neotropical tribe Gesnerieae, subtribe Ligeriinae, presently consisting of only three genera, Paliavana, Sinnigiaand Vanhouttea. These genera were separated from a larger concept of tribe Gloxinieae based on phylogenetic studies with molecular data. In Rio Grande do Sul, southern Brazil, 12 species and one natural h
Acta Bot. Bras.. Publicado em: 2015-09
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2. Effect of salt stress on the growth of Lippia gracilis Schauer and on the quality of its essential oil
This study evaluated the effect of salt stress on the growth of Lippia gracilis Schauer, a species native to the caatinga (shrublands) of Brazil and rich in essential oils, as well as on the quality of its oil. We exposed individuals of L. gracilis to NaCl, in the following concentrations, for a period of 40 days: 25 mM; 50 mM; 75 mM; and 100 mM. An addition
Acta Bot. Bras.. Publicado em: 2014-09
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3. First records of pollen rain in bromeliad tanks in an area of caatinga in northeastern Brazil
Species of Bromeliaceae have leaves in a spiral configuration. Because of the shape of the rosette thus formed and the imbricate configuration of the leaf sheaths, there is usually a tank in which rainwater and other components of the environment, including pollen grains, accumulate, making such tanks effective pollen rain collectors. The objective of this s
Acta Bot. Bras.. Publicado em: 2014-06
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4. Una nueva especie de Musaraña del género Cryptotis Pomel 1848 (Mammalia: Soricomorpha: Soricidae) de Ecuador y estatus taxonomico de Cryptotis equatoris Thomas (1912)
In this study four species of shrews of the genus Cryptotis are reported for Ecuador, and a species described here as Cryptotis niausa sp. nov., new for the science, distributed to the highlands of northern Ecuador and distinct from Cryptotis montivagus, which inhabits the grassland and shrublands of southern Ecuador. The new species is characterized by its
Pap. Avulsos Zool. (São Paulo). Publicado em: 2014
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5. Arbuscular mycorrhizal fungi in a semi-arid, limestone mining-impacted area of Brazil
The main goal of this study was to determine the diversity and activity of arbuscular mycorrhizal fungi (AMF) in an area degraded by limestone mining within the semi-arid region of Brazil known as the caatinga (shrublands). Near a limestone quarry, we selected two areas of caatinga (preserved and degraded) for study. The number of glomerospores did not diffe
Acta Bot. Bras.. Publicado em: 2013-12
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6. Reproductive phenological pattern of Calotropis procera (Apocynaceae), an invasive species in Brazil: annual in native areas; continuous in invaded areas of caatinga
In this study, we evaluated the phenological patterns (vegetative and reproductive) of Calotropis procera (Apocynaceae-Asclepiadoideae) in Brazil, comparing its phenology in an area where it is invasive with that observed in areas to which it is native. Phenological observations were carried out over a 24-month period at sites in and around areas of caatinga
Acta Bot. Bras.. Publicado em: 2013-06
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7. Taxonomic revision of Pseudolaelia Porto & Brade (Laeliinae, Orchidaceae)
Pseudolaelia is a genus endemic to eastern Brazil. The species are often epiphytes on Velloziaceae or are saxicolous, predominantly on granitic and gneissic outcrops (inselbergs) in the Atlantic Forest and, less often, in the campos rupestres (dry, rocky grasslands) of the cerrado (savanna) and caatinga (shrublands). The genus is characterized by homoblastic
Acta Bot. Bras.. Publicado em: 2013-06
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8. Species richness and distribution of bryophytes within different phytophysiognomies in the Chapada Diamantina region of Brazil
The Chapada Diamantina ecoregion is within the caatinga (shrublands) biome of Brazil. Environmental factors determine the phytophysiognomies that distinguish the ecoregion from the surrounding areas. This study aimed to investigate the distribution of bryophyte flora in this ecoregion, by phytophysiognomy and elevational zone. Analyzing specimens we collecte
Acta Bot. Bras.. Publicado em: 2013-06
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9. Fluctuating asymmetry of and herbivory on Poincianella pyramidalis (Tul.) L.P. Queiroz (Fabaceae) in pasture and secondary tropical dry forest
Plants subjected to stressful environments tend to be more asymmetric with reduced defenses and are therefore more vulnerable to herbivory. This study investigates the relationship between herbivory and fluctuating asymmetry (FA) in Poincianella pyramidalis in two contrasting habitat types in the Brazilian caatinga (shrublands). We tested the following hypot
Acta Bot. Bras.. Publicado em: 2013-03
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10. Structure and floristic pattern of a coastal dunes in southeastern Brazil
The Brazilian shrublands area (restinga) is composed of marine coast vegetation on Quaternary sandy plains, where the species composition can vary depending on the surrounding ecosystems. The aims of this study were to describe the structure and floristic composition of a restinga near the community of Itaúnas, in the northern part of the state of Espírito
Acta Bot. Bras.. Publicado em: 2013-03
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11. Chuva de sementes e estabelecimento de plântulas de espécies lenhosas florestais em mosaicos de floresta com araucária e campos no sul do Brasil / Seed rain and seedlind establishment of wood species in mosaics of araucaria forest and campos grassland in southern Brasil
Mecanismos de dispersão de diásporos e de recrutamento de plântulas evitam a competição intra-específica e possibilitam a colonização de novos ambientes, sendo etapas muito importantes para o estabelecimento de populações em novos sítios. Em áreas de transição entre florestas e vegetação campestre esses processos não são aleatórios, e sim
Publicado em: 2008
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12. Crecimiento secundario inusual en raíz principal de Pfaffia gnaphalioides (L. Fil.) Mart. (Amaranthaceae)
Pfaffia roots have been commercialized as "brazilian ginseng" and crude extracts of Pfaffia glomerata roots have analgesic and disinflamatory activity. Pfaffia gnaphalioides is a perennial herb and grows in southern Córdoba, Argentina. The objective of this work is to analyze root systems in Pfaffia gnaphalioides. Growth of above and belowground organs was
Acta Botanica Brasilica. Publicado em: 2007-03