1000 resultados para Variação Climática
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2015
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Dissertação de Mestrado Integrado em Medicina Veterinária
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2000
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O objetivo do presente estudo foi avaliar a variação genética e a seleção das melhores progênies de Myracrodruon urundeuva, Astronium fraxinifolium e Terminalia argentea, quanto aos caracteres de crescimento, em Selvíria, Mato Grosso do Sul. O teste de progênie foi instalado utilizando o delineamento de blocos ao acaso com 28 tratamentos, quatro repetições e dez plantas por parcela em linhas simples, no espaçamento 1,5 x 3,0 m. Aos 14 anos de idade, as progênies foram avaliadas quantos aos caracteres: altura (ALT); diâmetro a altura do peito (DAP); diâmetro médio da copa (DMC); forma do tronco (FT, escala de notas, variando de 1 a 5) e sobrevivência (SOB). Foram encontradas altas herdabilidades entre médias de progênies para os caracteres DAP (0,67), DMC (0,57) e forma do tronco (0,83), respectivamente. O ganho predito para DAP indica que a seleção baseada em informações, tanto de progênies, quanto de indivíduos dentro de progênies foram substanciais, o que denota uma boa perspectiva de exploração da variabilidade genética ao longo de um programa de melhoramento genético para as espécies estudadas, assim como o estabelecimento de estratégias para futura formação de um pomar de sementes.
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Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Civil e Ambiental, 2015.
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2015
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The seaweed Gracilaria domingensis is a common species in the coast of Rio Grande do Norte. This species lives in the intertidal zone, where colour strains (red, green and brown) co-occur during the whole year. Seaweeds that live in this region are exposed to daily changes and to the rhythm of the tide. During the low tide they are exposed to dissection, hiper-or hipo-osmotic shock, high temperatures and high irradiance. The aim of this study was to analyze whether the pigment and protein content of the colour strains of G. domingensis is affected by some environmental parameters in a temporal scale. The seaweeds were collected during 10 months in the seashore of Rio do Fogo (RN). The total soluble proteins and the phycobiliprotein were extracted in phosphate buffer and the carotenoids were analyzed by a standardized method through HPLC-UV. The pigments analysis showed that phycoerithrin is the most abundant pigment in the three strains. This pigment was strongly correlated with nitrogen and the photosynthetically active radiation. Chlorophyll presented higher concentrations than carotenoids during the whole, but the ratio carotenoid/chlorophyll-a was modified by incident radiation. The most abundant carotenoid was ß-carotene and zeaxanthin, which had higher concentrations in the higher radiation months. The concentration increase of zeaxanthin in this period indicated a photoprotective response of the seaweed. The three strains presented a pigment profile that indicates different radiation tolerance profile. Our results pointed that the green strain is better adapted to high irradiance levels than the red and brown strains
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Knowledge of the environmental factors influence on the spatial-temporal variation of fishes is important to fisheries management and conservation. Thus, the aim of this work was to analyze the influence of the abiotical factors on the spatial-temporal distribution of Paralonchurus brasiliensis (Pisces, Sciaenidae) caught by-catch with the shrimp fishing of Ubatuba and Caraguatatuba regions, north coast of São Paulo State. The fishes were captured every month from January to December 2002. Samples were collected by otter trawl at 5, 10, 15, 20, 25, 30 and 35m depths. The temperatures (surface and bottom), salinities (surface and bottom), sediment features and organic matters were verified for each depth. During all period of the study 12.642 specimens of P. brasiliensis were captured at Ubatuba and 17.166 at Caraguatatuba, which totalized the biomass of 267 for the first and 339kg for the other region. The females outnumbered males in fish population. The greatest values of biomass and number of individuals were registered at the summer and autumn seasons, while the lowest values were observed at the winter and spring seasons. The greatest abundances were found from 15 to 25m depth. In this study, it was verified that P. brasiliensis is a coastal waters associate species. The spatialtemporal distribution of P. brasiliensis is affected by intrusion of SACW and depth for the coastal region and by depth and sediment in sheltered areas such as Caraguatatuba
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In Brazilian semiarid region, the majority of water bodies are temporary and the biodiversity in these ecosystems is poorly known. The goal of this study was to describe the temporal variation of benthic macroinvertebrates in an intermittent stream in the Brazilian semiarid region. From March to July of 2009, surveys of benthic macroinvertebrates and water physiochemical parameters were done in a first order stream located at Piranhas-Açu River basin. 25 macroinvertebrates families were found, 21 belonging to Insecta class. The chironomids were the most abundant group during all study period and were represented by 19 genus. The largest densities and taxonomic richness were seen in the drying phase of the stream while the smallest values were found in the period with the heaviest rainfalls ( wet phase ). Only the families Chironomidae and Ceratopogonidae were found during all study period, suggesting that these groups have better adaptations to support floods and droughts. Furthermore, these two groups seemed to be pioneering in this stream. Among the chironomids, Paratendipes dominated the period of floods while Tanytarsus were more abundant in the drying phase . This study showed that hydrological fluctuation is the main force influencing the macroinvertebrate community in this stream, therefore, efforts seeking the conservation and management of Brazilian semiarid water bodies should consider this high natural variability in flow regime
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Nesta dissertação estudou-se a relação entre a Norma e a Variação no Ensino do Português. No Capítulo I realiza-se uma revisão crítica da bibliografia relativa aos conceitos e aos pressupostos teóricos relativos ao tema. No Capítulo II procede-se à análise das diversas dimensões e dos níveis de regulação do ensino do Português, avaliando primeiro o papel dos programas, as suas linhas orientadoras e a função dos manuais escolares que os apoiam, para em seguida se proceder à análise desses materiais com vista à identificação de uma dimensão normativa do ensino do Português e do modo como este atende à variação linguística. Com a análise dos manuais, no Capítulo III, pretendeu-se identificar, quantificar e avaliar, por um lado, o peso de matérias e conteúdos que já não provêm da gramática tradicional, mas de diferentes áreas da Linguística e, por outro lado, verificar a existência de referências explícitas ou implícitas quer à norma quer à variação linguística. Tal análise permitiu comprovar e concluir que, atendendo às directrizes programáticas e à orientação geral do ensino da língua materna, o ensino da Língua Portuguesa, fornecendo embora uma perspectiva mais abrangente do fenómeno linguístico, no conjunto dos ciclos e anos aqui analisados, se caracteriza pela fraca progressão no que diz respeito à explicitação do Funcionamento da Língua e ao desenvolvimento de efectivas competências (meta)linguísticas. /ABSTRACT: This dissertation is about the relationship between the linguistic norm and the Variation in the teaching of the Portuguese Language. ln chapter I there is a criticai review on the literature of the theoretical concepts and assumptions relating to this subject. ln chapter II you can find an analysis on the several dimensions and levels of regulation in the teaching of the portuguese language by first evaluating the role of the school programs, their guidelines and the role of the school textbooks which support them and to then analyse these material so as to identify the normative dimension in the Portuguese Language teaching and the way it meets the linguistic variation. The analysis of school textbooks in chapter III sought to identify, quantify and evaluate, on the one hand, the weight of themes and contents which don’t come from the traditional grammar but from different areas of linguistics and, on the other hand, to check the existence of explicit as well as implicit references not only to the linguistic norm but also to the linguistic variation. Considering the program guidelines and the general orientation of the mother-tongue teaching, this analysis has demonstrated and concluded that the Portuguese Language teaching, although within a boarder perspective of the linguistic phenomenon and all the cycles and years which were here analysed, can be characterized by its slow progression concerning the explicitness of the workings of the Language and the development of effective (meta)linguistic skills.
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O metano apresenta um potencial de aquecimento 23 a 32 vêzes maior que o do dióxido de C e a sua emissão diária em lavouras de arroz varia com a temperatura do solo e da água, e com o metabolismo das plantas.O objetivo deste estudo foi determinar o horário apropriado à coleta de amostras de ar para quantificar a emissão média diária de metano, informação fundamental para estudos visando a derivação de índices regionais de emissão desse gás. Com base nas curvas de emissão diária e considerando aspectos operacionais, o intervalo entre 9 e 12 horas é recomendado para a avaliação das emissões de metano em lavouras de arroz irrigado. Esse procedimento é válido para as sub-regiões produtoras de arroz no sul do Brasil. Sua adequação deve ser confirmada para outras regiões que apresentem condições ambientais diversas.
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2016
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2008
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2007
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2016