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| Registros recuperados: 115 | |
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| Vasconcelos,Heraldo L.; Araújo,Bruna B.; Mayhé-Nunes,Antonio J.. |
| Fungus-growing ants (tribe Attini) are characteristic elements of the New World fauna. However, there is little information on the patterns of diversity, abundance, and distribution of attine species in their native ecosystems, especially for the so-called "lower" genera of the tribe. A survey of attine ant nests (excluding Atta Fabricus, 1804 and Acromyrmex Mayr, 1865) was conducted in a variety of savanna and forest habitats of the Cerrado biome near Uberlândia, Brazil. In total, 314 nests from 21 species of nine genera were found. Trachymyrmex Forel, 1893 was the most diverse genus with 10 species. Eighteen species were found in the savannas, including Mycetagroicus cerradensis Brandão & Mayhé-Nunes, 2001, a species from a recently-described... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodiversity; Community structure; Forest; Savanna; Trachymyrmex. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752008000300009 |
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| BRANDÃO,Marcus V.; PEDROSO,Mônica A.; COLAS-ROSAS,Paul F.; AIRES,Caroline C.; ROCHA,Patrício A. da. |
| ABSTRACT Lophostoma carrikeri has been mostly recorded within the Amazon biome. There are scarce records in the northern Brazilian Amazon, but also records outside this biome, which were neglected in literature. The aim of this study was to update and extend the distribution of L. carrikeri. Seven new localities in Brazil were provided, including the first records for the states of Rondônia and Mato Grosso, filling a large gap in the species distribution, and three additional records for the state of Pará. Our results reinforce the notion that L. carrikeri is widely distributed in the Amazon, but is also present in other biomes in Brazil, such as Caatinga, Cerrado, and transitional areas. |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Carriker’s round-eared bat; Phyllostomini; Savanna; Rainforest; Ecotone. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672020000200119 |
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| Sampaio,Daniela; Castro Souza,Vinicius. |
| ABSTRACT The genus Sloanea is comprised of 150 species, of which about 50 occur in Brazil among several vegetation types but mainly the Amazon and Atlantic forests. The present work provides a synopsis of the Neotropical species of Sloanea in the extra-Amazonian region based on a recent revision of the genus. In general, morphologically Sloanea comprises large trees endowed with buttressed roots; simple leaves; flowers with sepals that may or may not cover the reproductive organs in pre-anthesis phases; stamens with the connective prolonged into an awn that is acuminate, acute or aristate and fruit covered with rigid or flexible bristles or sometimes unarmed. This synopsis describes 17 species, and provides an identification key, illustrations and comments... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atlantic Forest; Brazil; Diversity; Savanna; Taxonomy. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000300371 |
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| Batalha,Marco Antônio; Mantovani,Waldir. |
| We studied a 1225 ha area, composed mainly of cerrado, in Santa Rita do Passa Quatro, São Paulo State, southeastern Brazil (21°36-38'S, 47°36-39'W). In three cerrado physiognomies (campo cerrado -- a wooded savanna, cerrado sensu stricto -- a woodland, and cerradão -- a tall woodland), we collected all vascular plants in reproductive stage, and identified them to species level. We found 360 species, representing 236 genera and 69 families. The richest families were: Asteraceae, Fabaceae, Poaceae, and Rubiaceae. The savanna physiognomies were richer than the forest one. The ratio between herbaceous and woody species was approximately 2:1. We analysed the whole flora and its two components separately, woody and herbaceous, comparing them with other disjunct... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cerrado; Savanna; Physiognomy; Floristics; Woody/herbaceous ratio. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062001000300001 |
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| Custódio,Luciana Nascimento; Carmo-Oliveira,Renata; Mendes-Rodrigues,Clesnan; Oliveira,Paulo Eugênio. |
| The ability of plants to generate fertile offspring is influenced by morpho-physiological and ecological factors. Hence, reproductive success is directly linked to factors affecting quantity and quality of their progeny. In the Cerrado (savanna) of Brazil, the Vochysiaceae is a widely distributed and ecologically important family. Factors affecting pre-dispersal seed predation and abortion were studied for populations of Callisthene fasciculata, C. major, Qualea multiflora and Q. parviflora. To characterize differences between genera, as well as among species, study areas, and individuals, we quantified pre-dispersal seed predation and abortion. Differences of seed abortion among the species were related to intrinsic reproductive features and not to area... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Seed set; Abortion; Predation; Beetles; Neotropics; Savanna; Cerrado. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000300002 |
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| Lenza,Eddie; Abadia,Ana Clara; Menegat,Hélio; Lúcio,Nadjarriny W.; Maracahipes-Santos,Leonardo; Mews,Henrique A.; Santos,Josias O. dos; Martins,Jhany. |
| ABSTRACT We surveyed two savanna sites, one on flat terrain with deep soil (DS), and the other on hilly terrain with rocky outcrops and shallow soil (RS), before and after an accidental fire. We found that the fire did not cause any significant changes in the species composition or diversity of either community, and did not result in floristic homogenization. However, we did record a reduction in the density of plants and in basal area in the DS savanna in comparison with the RS savanna, as well as a higher rate of basal sprouting, which indicates a trade-off between mortality and sprouting. We conclude that, whereas post-fire changes in vegetation structure were more pronounced in the DS savanna than in the RS, the difference in the underlying substrate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diversity; Fire; Fuel; Savanna; Species composition. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000200250 |
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| Oliveira,Ana Paula de; Schiavini,Ivan; Vale,Vagner Santiago do; Lopes,Sérgio de Faria; Arantes,Carolina de Silvério; Gusson,André Eduardo; Júnior,Jamir Afonso Prado; Dias-Neto,Olavo Custódio. |
| The area evaluated in this study was a continuous stretch comprising three vegetation formations: gallery forest, semideciduous seasonal forest and cerradão (woodland savanna). The aim of this study was to examine the tree community dynamics in a forest gradient-from gallery forest to cerradão-at Panga Ecological Station, in the city of Uberlandia, located in the state of Minas Gerais, Brazil. The study was based on data from a previous inventory of the continuous forest conducted in 211 permanent 10 × 10 m sample plots in eight parallel transect running perpendicular to Panga Creek. Trees with a diameter at breast height > 4.77 cm were sampled in 1997, 2002 and 2007. With the exception of the cerradão, there was a net reduction in tree density over the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forest dynamics; Gallery forest; Semideciduous seasonal forest; Woodland savanna; Savanna. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000200010 |
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| Kolb,Rosana Marta; Pilon,Natashi Aparecida Lima; Durigan,Giselda. |
| Few studies address the ecology of herbs of Cerrado grasslands, which are ecosystems where the long dry season, high temperatures, insolation, fire and invasive grasses greatly influencing germination and the establishment of plants. We assessed germination of 13 species of Poaceae from Cerrado grasslands under nursery conditions or in germination chambers, the latter with i) recently collected seeds and seeds after six months storage, ii) under constant and alternating temperatures, and iii) in the presence and absence of light. Germinability, mean germination time (MGT) and required light were quantified to elucidate factors involved in successful germination. Germinability was low for most grasses, probably because of low seed viability. For most... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conservation; Grasslands; Poaceae; Savanna; Seed storage; Seed viability. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100087 |
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| Pinto,José Roberto Rodrigues; Mews,Henrique Augusto; Jancoski,Halina Soares; Marimon,Beatriz Schwantes; Bomfim,Bárbara de Oliveira. |
| Campos de murundus (grasslands dotted with knolls that are covered with savanna-like woody vegetation) are a common landscape in central Brazil. In this study, we assessed for the first time the dynamics of the vegetation in a floodplain campo de murundus, describing changes in composition and structure of the woody vegetation. In 2005, we established 16 permanent 25 × 25 m plots, where we identified and mapped individuals with a trunk diameter at the base ≥ 2.86 cm, as well as measuring the height of those individuals. In 2008 (after two fire events), we resampled the plots. In 2005, we had registered 4.54 m² ha-1 of basal area, 430 individuals, 42 species, 36 genera and 24 families. In 2008, we found an increase in basal area (to 4.65 m² ha-1) and a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Earth mounds; Fire; Mortality; Recruitment; Savanna. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000400005 |
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| Schwenk, Lunalva Moura; UFRJ; Cruz, Carla Bernadete Madureira; UFRJ. |
| A pesquisa trata da espacialização da ocupação da soja, levantada por imagens de satélite, em duas áreas no Planalto e Chapada dos Parecis, estando a Área I sob influência do eixo da BR-364 e a área II da BR-163. Estudaram-se os municípios consolidados, expandindo-se ou projetando-se no cultivo da soja, motivados pela implantação de rodovias. Na Área I, estão: Brasnorte, Campos de Júlio, Sapezal e Campo Novo dos Parecis e, na Área II: Sorriso, Lucas do Rio Verde, Nova Mutum, Vera, Nova Ubiratã, Santa Carmem e Claudia. Embora a soja possibilite o crescimento econômico, contribuindo para melhorar o padrão e qualidade de vida, concomitantemente, desencadeia inúmeros conflitos ambientais, ecológicos e sociais, pois, à medida que a fronteira agrícola avança e... |
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Palavras-chave: 5.01.00.00-9 Agronomia conflitos socioeconômicos-ambientais; Soja; Cerrado; Floresta; Eixos da BR-163 e BR-364. Socio-economical-environmental conflicts; Soybean; Savanna; Forests; BR-163 and BR-364. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5305 |
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| SILVA,PAULO R.D. DA; STEFENON,VALDIR M.. |
| The plant species occurring in the savanna region of the Cerrado biome in Brazil present typical morphological and physiological adaptations to a dry climate with seasonal occurrence of wildfires. In this study, the histological features of the root system, the main sites of synthesis and storage of starch and the initial phases of the bud development were characterized inJacaranda ulei. The anatomical features observed in the root system of J. ulei are related to the needs of the species to survive in the Cerrado. The histochemical analyses demonstrated high synthesis of glucose and glycoprotein after the third day of in vitro culture, in the proximal cells of the cortical parenchyma of the exoderm. Meristematic primordia were observed in the ninth day... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cerrado Biome; Histology; Savanna; Wildfire. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100271 |
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| SOUZA,MARCELO C.; FRANCO,AUGUSTO C.; HARIDASAN,MUNDAYATAN; ROSSATTO,DAVI R.; ARAÚJO,JANAÍNA F. DE; MORELLATO,LEONOR P.C.; HABERMANN,GUSTAVO. |
| Despite limitations of low fertility and high acidity of the soils, the cerrado flora is the richest amongst savannas. Many cerrado woody species show sclerophyllous leaves, which might be related to the availability of water and nutrients in the soil. To better understand the function and structure of cerrado vegetation within its own variations, we compared two cerrado communities: one in its core region in central Brazil (Brasília, DF) and the other on its southern periphery (Itirapina, SP). We contrasted the length of the dry season, soil fertility rates, leaf concentrations of N, P, K, Ca and Mg and the specific leaf area (SLA) between these communities. The dry season was shorter on the periphery, where the soil was more fertile although more acidic.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Savanna; Mineral nutrition; Rainfall seasonality; Specific leaf area. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401691 |
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| Rocha,Humberto R. da; Freitas,Helber C.; Rosolem,Rafael; Juárez,Robinson I.N.; Tannus,Rafael N.; Ligo,Marcos A.; Cabral,Osvaldo M. R.; Dias,Maria A.F. Silva. |
| The technique of eddy correlation was used to measure the net ecosystem exchange over a woodland savanna (Cerrado Sensu stricto) site (Gleba Pé de Gigante) in southeast Brazil. The data set included measurements of climatological variables and soil respiration using static soil chambers. Data were collected during the period from 10 October 2000 to 30 March 2002. Measured soil respiration showed average values of 4.8 molCO2 m-2s-1 year round. Its seasonal differences varied from 2 to 8 molCO2 m-2s-1 (Q10 = 4.9) during the dry (April to August) and wet season, respectively, and was concurrent with soil temperature and moisture variability. The net ecosystem CO2 flux (NEE) variability is controlled by solar radiation, temperature and air humidity on diel... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cerrado; Savanna; Photosynthesis; Soil respiration; Carbon sequestration; Eddy correlation. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032002000100009 |
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| Faria,Luiz Roberto Ribeiro; Silveira,Fernando Amaral da. |
| The composition of local orchid-bee faunas (Hymenoptera, Apidae, Euglossina) in open-vegetation domains is poorly known, making the ecology and biogeography of the group difficult to understand. The aim of this work was to answer the following questions: i) Is the orchid-bee fauna composition, species richness and abundance in the cerrado (Brazilian savanna) sensu stricto similar to that of riparian forests immersed in that domain? ii) Do species from neighboring forest domains use riparian forests as mesic corridors into the Cerrado? Two sites in cerrado s.s. and two in riparian forests were sampled monthly, one day per month, during one year (Nov/2003-Oct/2004) in northwestern Minas Gerais state, Brazil. Six aromatic compounds (β-ionone, 1,8-cineole,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Euglossina; Riparian forest; Gallery forest; Savanna; Landscape ecology. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000400009 |
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| Registros recuperados: 115 | |
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