Consulta: subjectFacets:"Brazilian savanna"
Registros recuperados: 28
Data/hora: 02/06/2024 06:57:36

Reproductive behavior of Leptodactylus mystacinus (Anura, Leptodactylidae) with notes on courtship call of other Leptodactylus species
Provedor de dados: 76
Autores: Oliveira Filho,Júlio C. de; Giaretta,Ariovaldo A.
Here we present data on the reproductive behavior of Leptodactylus mystacinus (Burmeister, 1861), including details on courtship behavior. We also describe and compared the courtship calls of L. mystacinus, L. furnarius Sazima &amp;amp; Bokermann, 1978 and Leptodactylus sp. (L. aff. andreae). Field works were conducted in Uberlândia (central Brazil). During courtship, a female approaches a calling male and is led to a previously excavated chamber; a female can approach a silent male that beat his hands and/or feet on the ground as well. The courtship call of L. mystacinus consists of one single arch-shaped note (duration = 0.04 s) repeated 258 times per minute; the courtship calls of L. furnarius (0.06 s, 84 times per minute) and Leptodactylus sp. (0.15 s,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Foam nests; Territoriality; Vocalization; Parental care.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212008000400015

Producao de sementes de Stylosanthes macrocephala cv. Pioneiro.
Provedor de dados: 14
Autores: ANDRADE, R. P. de.
bitstream/item/99406/1/comtec-66.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Stylosanthes macrocephala cultivar Pioneiro; Seed production; Brazilian savanna; Feed grasses.; Cerrado; Gramínea Forrageira; Produção; Semente.; Varieties.
Ano: 1993
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/548616

Solos areno-quartzosos no cerrado: caracteristicas, problemas e limitacoes ao uso.
Provedor de dados: 14
Autores: SPERA, S. T.; REATTO, A.; MARTINS, E. de S.; CORREIA, J. R.; CUNHA, T. J. F.
A expansao da agricultura no Cerrado levou a ocupacao de areas de ocorrencia de Areias Quartzosas. Esses solos apresentam textura arenosa (85% ou mais de fracao areia). Areias Quartzosas ou Neossolos Quartzarenicos representam 15% da area do cerrado. Sao solos cuja estrutura e formada basicamente de graos de quartzo, sendo portanto altamente suscetiveis a erosao, apresentam drenagem excessiva, baixa retencao de agua e lixiviacao de nutrientes. Quimicamente sao pobres em bases trocaveis, alicos e a capacidade de troca cationica desses solos depende quase que exclusivamente da materia organica. Os solos arenosos sao formados de rochas areniticas ou quartziticas. A fracao argila e dominada por quatzo e caulinita. Por serem solos com baixa capacidade de...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Arenossolo; Areia Quartzosa; Arenoso; Brasil; Brazilian savanna; Land capability; Lande use; Quartzipsamment; Sandy soil; Savanna; Use; Uso.; Aptidão Agrícola; Cerrado; Reconhecimento do Solo; Terra; Solo; Solo Arenoso; Uso da Terra.; Arenosols; Brazil; Land; Soil; Soil surveys.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/555305

Indicadores ecológicos: ferramentas para o monitoramento do processo de restauração ecológica.
Provedor de dados: 14
Autores: LIMA, P. A. F.; PACHÊCO, B. S.; SOUSA, S. R. de; GATTO, A.; AQUINO, F. de G.; ALBUQUERQUE, L. B. de.
bitstream/item/141932/1/doc-327.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Restauração ecológica; Indicadores ecológicos; Monitoramento ambiental; Brazilian savanna; Restoration of degraded areas; Ecological indicators.; Biodiversidade; Meio Ambiente.; Ecological restoration; Biodiversity; Environment; Environmental monitoring.
Ano: 2015
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1040917

Species richness and distribution of blackflies (Diptera: Simuliidae) in the Chapada Diamantina region, Bahia, Brazil
Provedor de dados: 82
Autores: Landeiro,Victor L; Pepinelli,Mateus; Hamada,Neusa.
Taxonomically, blackflies (Simuliidae) are among the best-known aquatic insects in Brazil. However, information on their distribution is lacking for many regions. We sampled simuliids in 50 streams in the Chapada Diamantina region, State of Bahia, located in three distinct geographical areas, 20 at Lençóis, 18 at Mucugê, and 12 at Rio de Contas. We analyzed simuliid species richness and distribution in the Chapada Diamantina area as a whole, as well as in each of the three distinct geographical areas. We collected 20 species, three of which were not yet described and two were described after our sampling. The three areas are distinct in relation to environmental variables, mainly owing to differences in altitude and water pH. Four species were restricted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical stream; Brazilian savanna; Altitude; PH.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2009000300006

Fish biomarker responses to perturbation by drought in streams
Provedor de dados: 83
Autores: Ondei,Luciana de Souza; Teresa,Fabrício Barreto; Garcia,Danielly Pereira; Felício,Andréia Arantes; da Silva,Danilo Grünig Humberto; de Almeida,Eduardo Alves.
ABSTRACT Drought can be viewd as a perturbation in running waters and fish are often trapped in isolated pools, where deterioration of water quality may be stressful. We investigated how this extreme condition influences response of oxidative stress biomarkers. The response of the characid Astyanax elachylepis was assessed during the dry and rainy seasons in intermittent and perennial (control) sites in streams from Brazilian savannah (Cerrado). We predicted that the biomarkers would be enhanced in the dry season in intermittent streams only due the environmentally harsh conditions in the few isolated pools that remain filled with water. As predicted, fish from the intermittent stream in the dry season presented higher gill MDA values, indicating greater...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Astyanax elachylepis; Antioxidant response; Brazilian savanna; Preparation for oxidative stress (POS); Seasonal variation.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000200218

A new synonym and seventeen new distributional records in South American Cerambycidae (Coleoptera), with notes on Chlorethe scabrosa Zajciw, 1963
Provedor de dados: 84
Autores: Santos-Silva,Antonio; Botero,Juan Pablo; Nascimento,Francisco Eriberto de Lima; Silva,Weliton Dias.
Abstract We studied 18 cerambycid beetle species native to South America. Seventeen represent new state records in Brazil. Particularly, Chlorethe scabrosaZajciw, 1963 is newly reported for the state of Rio de Janeiro with exclusion of C. brachypteraZajciw, 1963. The Brazilian state of the type locality of Dufauxia guaicurana Lane, 1955 is fixed. Pirangoclytus mendosus (Galileo &amp; Martins, 1996) is synonymized with P. mniszechii (Chevrolat, 1862), and its holotype is a female. Variation on Trypanidius maculatus Monné &amp; Delfino, 1980 is commented. New country and department records for Paraguay are also provided.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Longhorned beetles; Paraguay; Semiochemical traps; Taxonomy.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492020000100210

Role of soil carbon in the landscape functioning of the Alto São Bartolomeu watershed in the Cerrado region, Brazil
Provedor de dados: 86
Autores: Alves,Ray Pinheiro; Couto Junior,Antonio Felipe; Martins,Eder de Souza; Nardoto,Gabriela Bielefeld.
Abstract The objective of this work was to evaluate the effect of soil carbon on landscape functioning of the Oxisols covering the plateaus of the Alto São Bartolomeu watershed, in the Cerrado (Brazilian savanna) region of Central Brazil. Soil organic carbon (SOC) concentration, carbon stocks, and some soil physical and chemical characteristics were determined at the 0-0.20-m depth on native and anthropogenic areas. Soils from cerrado stricto sensu patches were similar both physically and chemically, being affected by exchangeable Al3+ and by SOC concentrations, while anthropogenic matrices were affected by soil bulk density, pH, extractable P, and exchangeable Ca2+ and Mg2+. The estimate of spatial distribution of soil carbon better fitted had an adjusted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; No-tillage; Oxisol; Pasture; Pedotransfer function; Vegetation indices.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901241

Test of hypotheses about herbivory and chemical defences of Qualea parviflora (Vochysiaceae) in Brazilian Cerrado
Provedor de dados: 88
Autores: Gonçalves-Alvim,Silmary J.; Lana,Tate C.; Ranieri,Bernardo D.; Fernandes,Geraldo Wilson.
(Test of hypotheses about herbivory and chemical defences of Qualea parviflora (Vochysiaceae) in Brazilian Cerrado). Qualea parviflora Mart. (Vochysiaceae), a widely distributed tree found in different habitats in Brazilian Cerrado (savanna), provides resources for a great variety of insects. In this study, we tested two hypotheses about plant investment in anti-herbivore defences along a fertility gradient in Cerrado: the carbon/nitrogen balance (CNBH) and resource availability (RAH). We also investigated how the pattern of herbivory varies through the year and among three types of vegetation in Brazilian Cerrado - campo sujo, cerrado sensu strictu and cerradão. Sampling was conducted in three types of vegetation and in rainy (January and November) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Insect-plant interaction; Leaf damage; Plant defences.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042011000200009

A new species of Bruggmanniella (Diptera, Cecidomyiidae, Asphondyliini) associated with Doliocarpus dentatus (Dilleniaceae) in Brazil
Provedor de dados: 92
Autores: Maia,Valéria Cid; Fernandes,G. Wilson; Oliveira,Lázaro A.
Bruggmanniella doliocarpi, a new galling species associated with Doliocarpus dentatus (Dilleniaceae) is described and illustrated (male, female, pupa, larva and gall) based on material from Minas Gerais, Brazil. The new species is compared to the other known Neotropical species. This is the first report of Bruggmanniella for Minas Gerais and in association with Dilleniaceae.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Gall midge; Neotropical; Taxonomy.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262010000200004

Fruits of Butia capitata (Mart.) Becc as good sources of β -carotene and provitamina
Provedor de dados: 94
Autores: Faria,Juliana Pereira; Siqueira,Egle M. A; Vieira,Roberto Fontes; Agostini-Costa,Tânia da Silveira.
Butia capitata is a palm tree, widely found in the Brazilian savanna. Their fruits are largely used by local communities to prepare juices, jellies and ice-creams. The main objective of this work was to determine the carotenoids profile of Butia capitata fruits and their provitamin A values. Total carotenoids content ranged from 11.1 to 43.9 μg.g-1; β-carotene was the predominant carotenoid (5.2-22.8 μg.g-1), followed by γ-carotene, phytoene, phytofluene, ζ-carotene, α-cryptoxanthin (or zeinoxanthin) and α-carotene. Provitamin A values varied from 50 to 200 RAE.100g-1. This result suggests that B. capitata pulp may be a good source of β-carotene and provitamin A.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Palm tree; Carotenoid.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452011000500084

How do males of Hypsiboas goianus (Hylidae: Anura) respond to conspecific acoustic stimuli?
Provedor de dados: 103
Autores: Morais,Alessandro R.; Siqueira,Mariana N.; Bastos,Rogério P.
ABSTRACT Acoustic communication plays an important role in the social behavior of anurans. Acoustic signals, which can be used in different contexts such as mate attraction and territory defense, may mediate social interactions among individuals. Herein, we used playback experiments to test whether males of Hypsiboas goianus (Lutz, 1968) change their vocal behavior in response to conspecific advertisement calls. Specifically, we used different field playback experiments in which we modified the time interval between advertisement calls to simulate males with distinct states of motivation (Sequence A and B). We did not observe differences in the acoustic response of males of H. goianus between the two types of field playback experiments. On the other hand,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anuran; Aggressive behavior; Brazilian savanna; Vocalizations.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702015000600431

Savanna woodland soil micromorphology related to water retention
Provedor de dados: 63
Autores: Juhász,Carlos Eduardo Pinto; Cooper,Miguel; Cursi,Patrícia Ribeiro; Ketzer,André Oppitz; Toma,Raul Shiso.
The limiting factors of the Brazilian savanna physical environment have been largely discussed. Soil morphology is fundamental to understand the behavior of soil water flow, soil physical properties and soil-landscape relationships. The aim of this study is to relate soil micro and macromorphologic attributes to soil water retention on a toposequence under native savanna woodland (cerradão) in a permanent plot of 320 m &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; 320 m installed in Assis, SP, Brazil. Samples collected at five points within the toposequence were used to determine the soil macroporosity by means of image analyses, estimated total porosity, chemical analysis, particle size distribution analysis and soil water retention. From the summit down to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Soil porosity; Soil water flow; Soil physical quality; Toposequence.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400005

Thermal comfort index and infrared temperatures for lambs subjected to different environmental conditions
Provedor de dados: 63
Autores: Paim,Tiago do Prado; Martins,Rafhael Felipe Saraiva; Cardoso,Cyntia; Dallago,Bruno; Louvandini,Helder; McManus,Concepta.
There is an abundance of thermal indices with different input parameters and applicabilities. Infrared thermography is a promising technique for evaluating the response of animals to the environment and differentiating between genetic groups. Thus, the aim of this study was to evaluate superficial body temperatures of lambs from three genetic groups under different environmental conditions, correlating these with thermal comfort indices. Forty lambs (18 males and 22 females) from three genetic groups (Santa Inês, Ile de France × Santa Inês and Dorper × Santa Inês) were exposed to three climatic conditions: open air, housed and artificial heating. Infrared thermal images were taken weekly at 6h, 12h and 21h at the neck, front flank, rear flank, rump, nose,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Bioclimatology; Thermal stress; Wind protection; Artificial warming.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500002

Mammals of the Bodoquena Mountains, southwestern Brazil: an ecological and conservation analysis
Provedor de dados: 104
Autores: Cáceres,Nilton C.; Bornschein,Marcos R.; Lopes,Wellington H.; Percequillo,Alexandre R.
We carried out a mammalian survey in the neighborhoods of the Serra da Bodoquena National Park, Mato Grosso do Sul state, a region poorly known in southwestern Brazil. During the months of April, May and July 2002 we used wire live trap, direct observation, indirect evidence (e.g. tracks), carcasses, and interviews with local residents to record mammalian species. Fifty six mammal species were recorded, including threatened species (14%). These records were discussed regarding species abundance, distribution, range extension, habitat, and conservation. The geographic distribution and ecology of the poorly known marsupials Thylamys macrurus and Micoureus constantiae in Brazil are emphasized.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Deciduous forest; Distribution; Mammalia; Species richness.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000200021

Floristic and phytosociological analysis of palm swamps in the central part of the Brazilian savanna
Provedor de dados: 39
Autores: Resende,Isa Lucia de Morais; Chaves,Lázaro José; Rizzo,José Ângelo.
We analyzed the floristics and phytosociology of three palm swamps in the municipality of Bela Vista de Goiás, located in the state of Goiás, Brazil, in the central part of the Brazilian savanna (Cerrado). The floristic surveys were conducted monthly from May 2008 to April 2009, and 310 species were recorded (seven bryophytes, 15 ferns and 288 angiosperms). Bryophytes belonged to five genera and five families; ferns belonged to nine genera and nine families; and angiosperms belonged to 134 genera and 45 families. The angiosperm families with the highest species richness were Poaceae, Cyperaceae, Asteraceae, Eriocaulaceae, Xyridaceae, Lentibulariaceae, Melastomataceae, Rubiaceae and Fabaceae. The palm swamps were divided into three zones of increasing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wetlands; Brazilian savanna; Plant diversity.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000100020

Species composition, diversity, and vegetation structure in a gallery forest-cerrado sensu stricto transition zone in eastern Mato Grosso, Brazil
Provedor de dados: 39
Autores: Lenza,Eddie; Santos,Josias O.; Maracahipes-Santos,Leonardo.
ABSTRACTWe investigated the existence of an ecotone in the species composition, diversity and vegetation structure in the transition between gallery forest and cerrado sensu strictoin central Brazil. We tested two hypotheses: 1) a ecotone can be found between gallery forest and cerrado; 2) a gradient exists in the species composition of the cerrado. We established three parallel transects of 5 m × 350 m running between gallery forest and cerrado, which were divided into subplots of 5 m × 10 m, perpendicular to the margin of the Bacaba stream in Nova Xavantina (Mato Grosso, Brazil). We identified and measured the height and diameter of individual plants in the plots with a diameter of at least 3 cm at 30 cm above the ground. We recorded 140 species, of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Continuum; Environmental heterogeneity; Species turnover; Vegetation type.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000300327

Patterns of growth, development and herbivory of Palicourea rigida are affected more by sun/shade conditions than by Cerrado phytophysiognomy
Provedor de dados: 39
Autores: Moura,Renan Fernandes; Alves-Silva,Estevão; Del-Claro,Kleber.
ABSTRACT Plant development is influenced by several abiotic factors, which in turn influence morphological traits and life history. We investigated whether leaf area, herbivory, toughness, fluctuating asymmetry, structural complexity and the number of inflorescences of Palicourea rigida are influenced by sun/shade conditions or by Cerrado phytophysiognomy (typical cerrado or rupestrian field). We expected to find greater structural complexity, leaf toughness and more inflorescences in sun plants; shaded plants were expected to exhibit a greater degree of fluctuating asymmetry (an index of plant stress), reduced leaf toughness and greater herbivory. As for phytophysiognomies, we expected to find higher levels of leaf toughness and reduced structural...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Environmental stress; Fluctuating asymmetry; Leaf area loss; Rubiaceae; Rupestrian grassland.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000200286

Temporal changes in species composition, diversity, and woody vegetation structure of savannas in the Cerrado-Amazon transition zone
Provedor de dados: 39
Autores: Maracahipes-Santos,Leonardo; Santos,Josias Oliveira dos; Reis,Simone Matias; Lenza,Eddie.
ABSTRACT Vegetation in the transition between tropical forest and savanna is hyperdynamic and there is evidence that in the absence of fire, forest advances over savanna. Between 2008 and 2013 we evaluated changes in species composition and diversity and in the structure of the woody vegetation of savanna physiognomies in the transition between the Cerrado and Amazon biomes that were fire free for 11 years. The physiognomies form a gradient from savanna woodland (Typical Cerrado - TC), to low woodland (Dense Cerrado - DC), to woodland (locally called Cerradão - CO). We hypothesise that: 1) the more open physiognomies (TC and DC) are more dynamic compared to the closed physiognomy (CO); and 2) in the absence of fire vegetation tends to become more forested....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternative stable states; Biodiversity; Brazilian savanna; Conservation; Mortality; Recruitment.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000200254

The rare genus Leptofoenus Smith, 1862 (Hymenoptera: Pteromalidae, Leptofoeninae): new records, and aspects of its distribution
Provedor de dados: 42
Autores: FERNANDES,DANIELL R.R.; KAWADA,RICARDO; TAVARES,MARCELO T.
Abstract: Despite being the largest and most remarkable species of Chalcidoidea, species of Leptofoeninae are very rarely collected. Here, we expand the distribution range extension of the Leptofoenus howardi (Ashmead, 1895) for Rondônia and Minas Gerais, Leptofoenus stephanoides (Roman, 1920) for Rondônia, Espírito Santo and São Paulo and Leptofoenus westwoodi (Ashmead, 1895) for Roraima, Amazonas, Rondônia, Bahia, Minas Gerais, Rio de Janeiro and Rio Grande do Sul.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon rainforest; Atlantic rainforest; Biology; Brazilian savanna; Brazilian dry forest; Neotropical region.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500614

Pedology and plant physiognomies in the cerrado, Brazil
Provedor de dados: 42
Autores: NERI,ANDREZA V.; SCHAEFER,CARLOS E.G.R.; SOUZA,AGOSTINHO L.; FERREIRA-JUNIOR,WALNIR G.; MEIRA-NETO,JOÃO A.A.
This study was carried out in Paraopeba National Reserve. It aims to classify and evaluate the soil of the studied area and to verify the influence of soil attributes on vegetation by testing the following hypotheses: 1) under woodland physiognomies (Cerradão) the soil fertility is higher and the Al content lower; 2) open savanna occurs only in areas with high Al contents. For this purpose, representative soils in the Paraopeba National Reserve were mapped, identified, and samples from five profiles were analyzed. The environmental gradient was easily observed by principal components analyses, where the differences between the sites were highlighted. The Spearman correlation was used to verify the hypothesis. The correlation between vegetation (basal area,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aluminum tolerance; Brazilian savanna; Edaphic features; Soil fertility; Soil-vegetation gradient.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100087

Structures related to resprouting potential of two Myrtaceae species from Cerrado: morpho-anatomical and chemical studies
Provedor de dados: 42
Autores: SILVA,GABRIELA S. DA; FERRARO,ALEXANDRE; OGANDO,FELIPE I.B.; AGUIAR,CLAUDIO L. DE; APPEZZATO-DA-GLÓRIA,BEATRIZ.
Abstract  Resprouting is a functional trait in species which occur in fire-prone ecosystems. These plants can resprout from aerial buds and by recruiting belowground bud bank using carbohydrates allocated in roots as resource. In this study, we present morpho-anatomical features and chemical composition related to the resprouting potential of two species of Eugenia L. in an area of the Cerrado (Brazilian savanna) under regeneration, after the clear-cutting of Pinus sp. with the later burning of pine needles layer. We used standard histological techniques for belowground organs analysis and aerial buds protection degree. Belowground buds in layer from soil surface down to 10 depth were counted and the chemical analyses were performed on roots. In all aerial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Accessory buds; Bud bank; Brazilian savanna; Colleters; Eugenia dysenterica; Eugenia punicifolia.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100702

Distribution of the spittlebug Deois flavopicta Stal (Homoptera: Cercopidae) on wild and cultivated host species
Provedor de dados: 44
Autores: Pires,Carmen S. S.; Price,Peter W.; Oliveira,Regina C. de.
Eleven species of native or naturalized grasses were found hosting spittlebug nymphs in the natural grassland areas around Brasília in the Fe-deral District of Brazil. A large number of nymphs were found on the species Axonopus marginatus (Trin.) Chase. Out of a total of 224 observed nymphs, 85.7% were found feeding on A. marginatus. Apparently the presence of the spittlebug nymphs in the cerrado vegetation, the Brazilian savanna, was associated with any form of disturbance, such as cattle grazing and partial deforestation. Nymphs were found only in disturbed areas of the "cerrado campo sujo" and in the cerrado sensu strictu. The densities of spittlebug nymphs in the cerrado were lower than the density found in the cultivated pasture. The nymphal density...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Nymphal density; Brazilian savanna; Brachiaria spp.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80592000000300003

Drosophilids (Insecta, Diptera) of the Paranã Valley: eight new records for the Cerrado biome
Provedor de dados: 49
Autores: Mata,Renata Alves da; Roque,Francisco; Tidon,Rosana.
The Paranã Valley, located in the Central Brazil Plateau, within the domain of the Cerrado biome, is frequently cited as a center of endemism and diversity. Nonetheless, this region is poorly known, mainly considering its invertebrate fauna. Here, drosophilid flies were used as biological tools to contribute to a broader inventory, whose goals were mapping the Cerrado biodiversity and identifying areas to be conserved. Three previously unsampled areas in the Paranã Valley were sampled. Amongst the 12,297 specimens collected 45 species were identified, which represents 50% of the drosophilid species previously recorded in the Cerrado. Moreover, this sampling presented eight new occurrences for the biome (Drosophila annulosa, D. calloptera, D. papei, D....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Brazilian savanna; Central Brazil Plateau; Conservation; Drosophila; Inventory.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000100006

Structure and floristic relationships between Cerrado sensu stricto sites on two types of substrate in northern Cerrado, Brazil
Provedor de dados: 49
Autores: Lemos,Helena Lara; Pinto,José Roberto Rodrigues; Mews,Henrique Augusto; Lenza,Eddie.
We described and compared the floristic composition, richness, species diversity and structure of the tree-shrub component in pairs of Typical Cerrado (Cerrado Típico) and rocky outcrop Cerrado (Cerrado Rupestre) in two localities in Tocantins State. In each locality, we set up 10 plots of 20 × 50 m at a site, the Cerrado Típico and other Cerrado Rupestre, and sampled the individuals with Db30cm ≥ 5 cm. The rocky outcrop Cerrado did not present any trend towards lower richness and basal area compared to the Cerrado on deep soil. Few species occurred across the four sites and only two important species (Anacardium occidentale and Qualea parviflora) in the four vegetation structure were common to both environments assessed. Furthermore, the occurrence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Cerrado Rupestre; Cerrado Típico; Conservation; Floristic similarity.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000400121

Variation in the sugar yield in response to drying-off of sugarcane before harvest and the occurrence of low air temperatures
Provedor de dados: 53
Autores: Araújo,Renato; Alves Junior,José; Casaroli,Derblai; Evangelista,Adão Wagner Pêgo.
ABSTRACT The need to irrigate sugarcane in the Brazilian Savanna is due to the lack of rain from April to September. For efficient sugar accumulation, the crop needs water stress or heat stress at the maturation stage. However, when the water deficit is intense at this stage, it occurs the reduction in crop production. The objective of this study was: (i) to assess the quality of the raw material of sugarcane in different drying-off seasons before harvest; (ii) to evaluate the influence of heat stress on the culture. The experiment was conducted in Santo Antônio de Goiás (GO), Brazil, in Oxisol, with CTC4 variety in cane-plant cycle. A randomized block design in a split-plot array in time was used. The treatments of the plots were five drying-off times...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Irrigation management; Brazilian savanna; Thermal stress.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000100118

Sentinels in Saltator atricollis (Passeriformes: Emberizidae)
Provedor de dados: 57
Autores: RAGUSA-NETTO,J.
I studied the existence of sentinels in Saltator atricollis in a 'campo-cerrado' (Brazilian savanna) during the breeding seasons of 1994-95 and 1995-96. Groups of this species consisted of two to seven birds (N = 25). Sentinels were present (mean ± sd) 62% ± 9% of the time, and most sentinel bouts lasted from less than one to six minutes (although in some occasions for more than 30 min.). Overlap of two or more sentinels occurred on average only 3.2% of the time with birds on guard. Sentinels commonly gave contact calls in the beginning and/or at the end of a sentinel bout. The group size had no effect on time with sentinels. However the encounter rate between raptors and groups significantly influenced the time guarded. The results of this study suggests...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Emberizidae; Brazilian savanna; Raptors; Alertness; Sentinels.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200015

Leaf heliotropism in Styrax camporum Pohl from the Brazilian cerrado: distinct gas exchange and leaf structure, but similar leaf temperature and water relations
Provedor de dados: 61
Autores: Habermann,Gustavo; Machado,Silvia R.; Guimarães,Vandeir F.; Rodrigues,João D.
Styrax camporum is a common shrub species from the cerrado regions of São Paulo State, Brazil. Although its leaves do not have a morphologically delimited pulvinus, the apical leaves are oriented parallel to the sun (paraheliotropic leaves), most notably around noon. Horizontal leaves at the base of shoots are oriented perpendicular to the sun's rays (diaheliotropic leaves). The ecophysiological significance of this is not fully understood. We investigated how paraheliotropism influences daily CO2 assimilation (A) and other gas exchange rates, water relations, leaf temperature (Tl), and how these relate to leaf structure as assessed by anatomical leaf descriptions. Paraheliotropic leaves had greater A and stomatal conductance (g s), which led to greater...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Ecophysiology; Gas exchange; Leaf movements; Leaf temperature; Photosynthesis; Styracaceae.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000100008