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Registros recuperados: 29
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Patterns of growth, development and herbivory of Palicourea rigida are affected more by sun/shade conditions than by Cerrado phytophysiognomy Acta Botanica
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
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Temporal changes in species composition, diversity, and woody vegetation structure of savannas in the Cerrado-Amazon transition zone Acta Botanica
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
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Floristic and phytosociological analysis of palm swamps in the central part of the Brazilian savanna Acta Botanica
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
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Species composition, diversity, and vegetation structure in a gallery forest-cerrado sensu stricto transition zone in eastern Mato Grosso, Brazil Acta Botanica
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
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The rare genus Leptofoenus Smith, 1862 (Hymenoptera: Pteromalidae, Leptofoeninae): new records, and aspects of its distribution Anais da ABC (AABC)
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
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Pedology and plant physiognomies in the cerrado, Brazil Anais da ABC (AABC)
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
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Structures related to resprouting potential of two Myrtaceae species from Cerrado: morpho-anatomical and chemical studies Anais da ABC (AABC)
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
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Distribution of the spittlebug Deois flavopicta Stal (Homoptera: Cercopidae) on wild and cultivated host species Anais da SEB
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
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Drosophilids (Insecta, Diptera) of the Paranã Valley: eight new records for the Cerrado biome Biota Neotropica
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
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Structure and floristic relationships between Cerrado sensu stricto sites on two types of substrate in northern Cerrado, Brazil Biota Neotropica
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
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Variation in the sugar yield in response to drying-off of sugarcane before harvest and the occurrence of low air temperatures Bragantia
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
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Sentinels in Saltator atricollis (Passeriformes: Emberizidae) BJB
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
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Leaf heliotropism in Styrax camporum Pohl from the Brazilian cerrado: distinct gas exchange and leaf structure, but similar leaf temperature and water relations Braz. J. Plant Physiol.
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
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Reproductive behavior of Leptodactylus mystacinus (Anura, Leptodactylidae) with notes on courtship call of other Leptodactylus species Iheringia, Sér. Zool.
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 & 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
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Indicadores ecológicos: ferramentas para o monitoramento do processo de restauração ecológica. Infoteca-e
LIMA, P. A. F.; PACHÊCO, B. S.; SOUSA, S. R. de; GATTO, A.; AQUINO, F. de G.; ALBUQUERQUE, L. B. de.
Tipo: Folhetos Palavras-chave: Restauração ecológica; Indicadores ecológicos; Monitoramento ambiental; Brazilian savanna; Restoration of degraded areas; Ecological indicators; Biodiversidade; Meio Ambiente; Biodiversity; Ecological restoration; Environment; Environmental monitoring.
Ano: 2015 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1040917
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Superfosfato triplo como fonte alternativa de fosforo no sal mineral de gado de corte. Infoteca-e
LOPES, H. O. da S.; PEREIRA, E. A.; SOARES, W. V.; PEREIRA, G.; FICHTNER, S. S.; VITTI, D. M. S. S.; ABDALLA, A. L..
Tipo: Folhetos Palavras-chave: Mineral nutrients; Brazilian savanna; Cerrado; Fósforo; Gado de Corte; Nutrição Animal; Sais Minerais; Suplemento Mineral; Superfosfato; Animal nutrition; Beef cattle; Phosphorus; Salts; Superphosphate.
Ano: 1994 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/549900
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Producao de sementes de Stylosanthes macrocephala cv. Pioneiro. Infoteca-e
ANDRADE, R. P. de.
Tipo: Folhetos 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
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Solos areno-quartzosos no cerrado: caracteristicas, problemas e limitacoes ao uso. Infoteca-e
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: Folhetos 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; Uso da Terra; Terra; Solo Arenoso; Solo; Arenosols; Brazil; Land; Soil surveys; Soil.
Ano: 1999 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/555305
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Species richness and distribution of blackflies (Diptera: Simuliidae) in the Chapada Diamantina region, Bahia, Brazil Neotropical Entomology
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
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Fish biomarker responses to perturbation by drought in streams Neotropical Ichthyology
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
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