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| Registros recuperados: 10 | |
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| Hoffmann,Diego; Vasconcelos,Marcelo F.; Lopes,Leonardo E.; Rodrigues,Marcos. |
| O presente artigo descreve o comportamento de forrageamento e a dieta de Polystictus superciliaris (Wied, 1831), espécie pouco conhecida e de distribuição geográfica restrita às montanhas do leste do Brasil. Este trabalho foi realizado entre abril e dezembro de 2005 no Parque Estadual da Serra do Rola Moça, município de Nova Lima, Minas Gerais (20°03'S, 44°00'W). Para cada observação de forrageamento foram registrados os comportamentos de ataque, a direção e o substrato do ataque, a altura do substrato de forrageamento e a fitofisionomia onde o ataque ocorreu. Para a determinação da dieta da espécie foram feitas observações diretas de campo, sendo também analisado o conteúdo estomacal de 16 indivíduos. Polystictus superciliaris usa preferencialmente a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cadeia do Espinhaço; Comportamento de forrageamento; Conteúdo estomacal; Dieta; Canga. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212007000300014 |
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| Hoffmann,Diego; Rodrigues,Marcos. |
| Polystictus superciliaris (Wied, 1831) is a small tyrant-flycatcher endemic to mountaintops in the highlands of eastern Brazil. In this paper we present the first description of the breeding biology of P. superciliaris and estimate its reproductive success from a population inhabiting rocky outcrops. This study was conducted during 2005 in the Parque Estadual da Serra do Rola Moça, municipality of Nova Lima (20°03'S, 44°00'W), state of Minas Gerais, southeastern Brazil. Fourteen pairs of P. superciliaris were banded and monitored. The onset of the breeding season in 2005 was assumed to have been sometime before the 26th of July, while it was assumed to have ended on the 23rd of November based on the last observation of a successful brood. Clutch size was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Canga; Clutch size; Laying date; Mayfield method; Nest predation. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000300004 |
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| Valim,Eduardo André Ribeiro; Nalini Jr,Hermínio Arias; Kozovits,Alessandra Rodrigues. |
| Ecosystems on cangas (duricrust) present considerable heterogeneity of habitats due to microtopographic variations, soil accumulation and a variety of plant functional groups. Therefore, spatial and temporal ecosystem processes such as litterfall are to be expected to be large, and the absence of a level of productivity represents all the facets of iron-rich landscapes. We investigated litterfall in a iron-rich rock complex in the Iron Quadrangle of Brazil, with habitats formed on different evolutionary stages of the soil, resulting in a gradient of biomass, canopy cover and community structure. The measurements were made in open field areas, dominated by herb-shrub vegetation and interspersed with islands of dense vegetation in which there were individual... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Canga; Iron duricrust; Ferruginous fields; Litter production; Ecosystem productivity. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200005 |
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| Figueiredo,Maurilio Assis; Diniz,Adriana Pedrosa; Abreu,Adriana Trópia de; Messias,Maria Cristina Teixeira Braga; Kozovits,Alessandra Rodrigues. |
| ABSTRACT Recovery of degraded areas of rupestrian grasslands is hampered mainly by the limited knowledge regarding substrate management and the biology of native species suitable for revegetation of these areas. The aim of our study was to examine the establishment and growth of Periandra mediterranea in different textures of lateritic substrate from a mining-degraded area. The growth of P. mediterranea was evaluated using fine and coarse laterite, both with and without the addition of topsoil. Survival, dry biomass, content of chemical elements and nodulation were evaluated in ten individuals per treatment sixteen months after planting. Although the substrate has low nutrient content, yet high metal concentrations, all plants survived. Plants growing on... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bauxite; Canga; Leguminosae; Recovery of degraded areas; Rock outcrops; Topsoil. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000200232 |
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| Oliveira,Paula Alves; Pereira,Israel Marinho; Messias,Maria Cristina Teixeira Braga; Oliveira,Marcio Leles Romarco de; Pinheiro,André César; Machado,Evandro Luiz Mendonça; Oliveira,Junior Lacerda Alves de. |
| ABSTRACT Rupestrian complexes of the Serra do Espinhaço are recognized for their high degree of biodiversity and endemism. However, environmental impacts, particularly from mining, have degraded these environments. The purpose of this study was to describe the herbaceous-subshrub communities that occur in quartzitic (QRC) and ferruginous (FRC) rupestrian complexes in different seasons of the year, with regard to floristic similarity and phytosociological structure. Additionally, the study aimed to identify native species with potential use for the restoration of similar degraded areas. Vegetation was sampled from plots located in the municipality of Conceição do Mato Dentro, state of Minas Gerais. Five contiguous strata of 10 × 50 m were demarcated in each... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Canga; Cerrado; Ferruginous grasslands; Restoration of degraded areas; Rupestrian grasslands. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000100141 |
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| GARCIA,LETÍCIA C.; BARROS,FERNANDA V.; LEMOS-FILHO,JOSÉ P.. |
| ABSTRACT Banded iron formations (BIF) have a particular vegetation type and provide a good model system for testing theories related to leaf phenology, due to unique stressful environmental conditions. As a consequence of the stressful conditions of BIF environment, we hypothesize that most species would retain at least some significant canopy cover, even at the end of the dry season, independently of growth form - trees, shrubs, and sub-shrubs. Considering the strong seasonality, we also hypothesize that photoperiod and rainfall act as triggers for leaf fall and leaf flushing in these environments. The majority of the fifteen studied species had a semi-deciduous behavior and shed their leaves mainly during the dry season, with a recovery at the end of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Canga; Day length; Drought stress; Evergreen; Leaf shedding; Tropical ecosystems. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100131 |
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| Nunes,Jaquelina A.; Schaefer,Carlos E.G.R.; Ferreira Júnior,Walnir G.; Neri,Andreza V.; Correa,Guilherme R.; Enright,Neal J.. |
| Vegetation and soil properties of an iron-rich canga (laterite) island on the largest outcrop of banded-iron formation in Serra de Carajás (eastern Amazonia, Brazil) were studied along a topographic gradient (738-762 m asl), and analyzed to test the hypothesis that soil chemical and physical attributes play a key role in the structure and floristic composition of these plant communities. Soil and vegetation were sampled in eight replicate plots within each of the four vegetation types. Surface (0-10 cm) soil samples from each plot were analyzed for basic cations, N, P and plant species density for all species was recorded. CCA ordination analysis showed a strong separation between forest and non-forest sites on the first axis, and between herbaceous and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon Forest; Canga; Carajás; Ferruginous campo rupestre; Iron formation; Laterite. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502097 |
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| Registros recuperados: 10 | |
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