Brazilian Savannas
Mostrando 13-24 de 38 artigos, teses e dissertações.
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13. Tree species of South America central savanna: endemism, marginal areas and the relationship with other biomes
Biological knowledge is important for guidance of conservation polices. In the Cerrado, an extremely diverse biome, the last synthesis of floristic knowledge has more than ten years. To understand the progress on the information, our aim was quantify the tree species of the Cerrado, and assess their distribution. We compiled 167 inventories and rapid surveys
Acta Bot. Bras.. Publicado em: 2016-03
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14. Anatomical and morphological modifications in response to flooding by six Cerrado tree species
Wetlands are common in the Cerrado (Brazilian savannas) biome, however flooding of these wetlands impairs growth and development of most plants. We evaluated flood tolerance of typical Cerrado trees. Seedlings of Aspidosperma macrocarpon (Apocynaceae), Tabebuia rosea (Bignoniaceae), Handroanthus chrysotrichus (Bignoniaceae), Myracrodruon urundeuva (Anacardia
Acta Bot. Bras.. Publicado em: 2015-12
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15. Xyridaceae of Viruá National Park, Roraima state, Brazil
Abstract A taxonomic treatment of the Xyridaceae in the Viruá National Park is presented. Located in Roraima state, northern Brazil, the park comprises a mosaic of lowland vegetation types, including forests, wetlands, and one of the largest continuous areas of campinarana in the Brazilian Amazon Basin. Xyridaceae are represented in the park by 20 species i
Rodriguésia. Publicado em: 2015-06
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16. Spatial and temporal dynamics of drosophilid larval assemblages associated to fruits
The study of organisms and their resources is critical to further understanding population dynamics in space and time. Although drosophilids have been widely used as biological models, their relationship with breeding and feeding sites has received little attention. Here, we investigate drosophilids breeding in fruits in the Brazilian Savanna, in two contras
Rev. Bras. entomol.. Publicado em: 2015-03
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17. Geographical variation in the reproduction and sexual dimorphism of the Boddaert's tropical racer, Mastigodryas boddaerti (Serpentes: Colubridae)
We obtained data on time of sexual maturity, dimorphism, fecundity and on the reproductive cycle of Mastigodryas boddaerti (Sentzen, 1796) through the examination of 321 preserved specimens, of which 221 were collected in the Brazilian Amazon region and 100 in the Cerrado savannas of Central Brazil. The degree of sexual size dimorphism (snout-vent length, SV
Zoologia (Curitiba). Publicado em: 2013-10
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18. Mantel test in population genetics
The comparison of genetic divergence or genetic distances, estimated by pairwise F ST and related statistics, with geographical distances by Mantel test is one of the most popular approaches to evaluate spatial processes driving population structure. There have been, however, recent criticisms and discussions on the statistical performance of the Mantel test
Genet. Mol. Biol.. Publicado em: 2013
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19. Avaliação da contaminação de córregos de Cerrado por metais pesados utilizando-se larvas de Odonata como bioindicadores / Assessment of heavy metal contamination in Brazilian savannas streams using Odonata larvae as bioindicators
The aquatic ecosystems are the main receptors of pollutants and contaminants from industrial and agricultural activities and of the discharge of sewage. Among the various substances potentially harmful, heavy metals are a threat to the aquatic ecosystems and the biota. This research aimed to evaluate the contamination of Cerrados streams by heavy metals usin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012
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20. Evolução e ecologia de tricomas em Bignonieae (Bignoniaceae): estruturas morfológicas de defesa anti-herbivoria? / Evolution and ecology of trichomes in Bignonieae (Bignoniaceae): morphological structures of anti-herbivory defense?
This thesis focused on the evolutionary-ecology of trichomes in the tribe Bignonieae (Bignoniaceae), and in the potential defensive role of these structures against herbivores. More specifically, we characterized four trichome morphotypes found in vegetative plant parts of representatives of the Bignonieae, as well as studied the macro-evolutionary patterns
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/11/2011
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21. Resposta do arroz de terras altas a diferentes doses de carvão vegetal: desenvolvimento da planta e deficiência hídrica / Resposta do arroz de terras altas a diferentes doses de carvão vegetal: desenvolvimento da planta e deficiência hídrica / Response of upland rice to different doses of charcoal, plant development and water deficit / Response of upland rice to different doses of charcoal, plant development and water deficit
The average national rice yield was 11,3 million tones, with a harvested area of about 2,7 million hectares (IBGE 2010). Part of this comes from upland production systems in savannas that have high acidity, low fertility, with low phosphorus and potassium levels, low cation exchange capacity and high aluminum saturation. Upland rice in the Brazilian savannas
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/02/2011
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22. Conceitos e considerações práticas do sistema de geração de mapas de produtividade na cultura de grãos.
ABSTRACT: Precison Agriculture adoption is increasing on savannas region in the central plain areas in Brazil, principally because fertilizers and others pesticides were saved reducing the cost of grain production in the agricultural areas. But environmental pollution with these products area also become a problem. It was estimated that the are with variable
Planaltina. Publicado em: 2011
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23. Aptidão agrícola das terras da bacia hidrográfica do Ribeirão Taguatinga, Distrito Federal.
RESUMO: A área da bacia hidrográfica do Ribeirão Taguatinga (Área de Relevante Interesse Ecológico Juscelino Kubitschek - ARIE JK), no Distrito Federal, tem superfície de 77,50 km2. As principais classes de solos que ocorrem nessa área são: Latossolos, Argissolos, Cambissolos, Gleissolos, Plintossolos, Neossolos Fúvicos e Neossolos Quartzarênicos c
Planaltina. Publicado em: 2011
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24. Fixação de nitrogênio pela soja em sistemas de cultivo contínuo e rotacionado com pecuária nos Cerrados.
Quantificou-se a contribuição da fixação biológica de N2 (FBN) na cultura da soja em um Latossolo Vermelho-Escuro, utilizando-se a técnica da abundância natural do isótopo 15N. Foram estudados cinco tratamentos: 1) soja de primeiro ano em solo cultivado por quatro anos com Brachiaria decumbens, sob pastejo, e preparado mecanicamente (arado, grade pes
Campo Grande. Publicado em: 2011