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  Subjects -> HISTORY (Total: 1302 journals)
    - HISTORY (816 journals)
    - History (General) (51 journals)
    - HISTORY OF AFRICA (49 journals)
    - HISTORY OF ASIA (55 journals)
    - HISTORY OF AUSTRALASIA AREAS (8 journals)
    - HISTORY OF EUROPE (170 journals)
    - HISTORY OF THE AMERICAS (129 journals)
    - HISTORY OF THE NEAR EAST (24 journals)

HISTORY (816 journals)                  1 2 3 4 5 | Last

Showing 1 - 200 of 452 Journals sorted alphabetically
40 [degrees] South     Full-text available via subscription   (Followers: 2)
Aboriginal History     Full-text available via subscription   (Followers: 9)
Abstracta Iranica     Open Access   (Followers: 14)
Acadiensis : Journal of the History of the Atlantic Region / Acadiensis : revue d'histoire de la region Atlantique     Full-text available via subscription   (Followers: 5)
Accounting History Review     Hybrid Journal   (Followers: 18)
Acta Amazonica     Open Access   (Followers: 4)
Acta Historiae Artium     Full-text available via subscription   (Followers: 4)
Acta Orientalia     Full-text available via subscription   (Followers: 17)
Actes d'Història de la Ciència i de la Tècnica     Open Access  
Advances in Historical Studies     Open Access   (Followers: 6)
Africa Confidential     Hybrid Journal   (Followers: 19)
Africa Research Bulletin: Political, Social and Cultural Series     Hybrid Journal   (Followers: 9)
Africa Today     Full-text available via subscription   (Followers: 16)
African and Asian Studies     Hybrid Journal   (Followers: 20)
African Diaspora     Open Access   (Followers: 8)
African Historical Review     Hybrid Journal   (Followers: 17)
African Natural History     Open Access   (Followers: 2)
Agora     Full-text available via subscription   (Followers: 3)
Agricultural History Review     Full-text available via subscription   (Followers: 9)
Akroterion     Full-text available via subscription   (Followers: 4)
Al-Masaq: Islam and the Medieval Mediterranean     Hybrid Journal   (Followers: 28)
albuquerque : revista de história     Open Access  
Almagest     Full-text available via subscription   (Followers: 1)
Altorientalische Forschungen     Hybrid Journal   (Followers: 6)
American Archivist     Hybrid Journal   (Followers: 176)
American Communist History     Hybrid Journal   (Followers: 19)
American Jewish History     Full-text available via subscription   (Followers: 17)
American Nineteenth Century History     Hybrid Journal   (Followers: 21)
American Periodicals : A Journal of History, Criticism, and Bibliography     Full-text available via subscription   (Followers: 8)
American Review of Canadian Studies     Hybrid Journal   (Followers: 7)
American Studies     Full-text available via subscription   (Followers: 22)
Amérique Latine Histoire et Mémoire     Open Access   (Followers: 2)
Amsterdamer Beitrage zur alteren Germanistik     Full-text available via subscription   (Followers: 3)
Amsterdamer Beitrage zur neueren Germanistik     Full-text available via subscription   (Followers: 3)
Anais do Museu Paulista : História e Cultura Material     Open Access   (Followers: 1)
Analecta Bollandiana     Full-text available via subscription   (Followers: 3)
Anales de Historia del Arte     Open Access   (Followers: 6)
Anatolica     Full-text available via subscription   (Followers: 10)
Ancient Civilizations from Scythia to Siberia     Hybrid Journal   (Followers: 12)
Ancient History : Resources for Teachers     Full-text available via subscription   (Followers: 1)
Anglican Historical Society Journal     Full-text available via subscription   (Followers: 3)
Annales historiques de la Révolution française     Open Access   (Followers: 12)
Annales UMCS, Historia     Open Access   (Followers: 5)
Annali dell'Istituto e Museo di storia della scienza di Firenze     Hybrid Journal  
Annuaire de l'Ecole pratique des hautes etudes. Section des sciences historiques et philologiques     Open Access   (Followers: 9)
Annual Bulletin of Historical Literature     Hybrid Journal   (Followers: 13)
ANQ: A Quarterly Journal of Short Articles, Notes, and Reviews     Hybrid Journal   (Followers: 1)
Antike und Abendland     Hybrid Journal   (Followers: 10)
Antiteses     Open Access  
Anuario de Estudios Atlánticos     Open Access   (Followers: 1)
Anuario de Historia de la Iglesia     Open Access   (Followers: 3)
Arabian Humanities     Open Access   (Followers: 2)
Arabica     Hybrid Journal   (Followers: 8)
ARAM Periodical     Full-text available via subscription   (Followers: 3)
Araucaria. Revista Iberoamericana de Filosofía, Política y Humanidades     Open Access   (Followers: 1)
Archeion     Full-text available via subscription  
ArcheoArte. Rivista Elettronica di Archeologia e Arte     Open Access   (Followers: 7)
Architectural Heritage     Hybrid Journal   (Followers: 25)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 7)
Archives Internationales d'Histoire des Sciences     Partially Free   (Followers: 4)
Archives of Natural History     Hybrid Journal   (Followers: 7)
Area     Hybrid Journal   (Followers: 12)
Arenal. Revista de historia de las mujeres     Open Access   (Followers: 1)
Aristotelian Society Supplementary Volume     Hybrid Journal   (Followers: 2)
Arizona Journal of Hispanic Cultural Studies     Full-text available via subscription   (Followers: 3)
Art History     Hybrid Journal   (Followers: 237)
Arthuriana     Full-text available via subscription   (Followers: 5)
Arys: Antigüedad, Religiones y Sociedades     Open Access   (Followers: 1)
Aschkenas     Hybrid Journal   (Followers: 3)
Asia Pacific Business Review     Hybrid Journal   (Followers: 5)
Asia Pacific Journal of Education     Hybrid Journal   (Followers: 19)
Asia-Pacific Journal : Japan Focus     Open Access   (Followers: 8)
Asian Journal of Social Psychology     Hybrid Journal   (Followers: 5)
Asian Perspectives     Full-text available via subscription   (Followers: 9)
Asian Philosophy: An International Journal of the Philosophical Traditions of the East     Hybrid Journal   (Followers: 7)
Asian Review of World Histories     Hybrid Journal  
Asian Studies Review     Hybrid Journal   (Followers: 17)
Aspasia     Full-text available via subscription  
Astérion     Open Access   (Followers: 1)
Ateliê de História UEPG     Open Access  
Aurora Journal     Full-text available via subscription  
Austral Ecology     Hybrid Journal   (Followers: 14)
Australasian Journal of Irish Studies, The     Full-text available via subscription   (Followers: 9)
Australasian Review of African Studies, The     Full-text available via subscription   (Followers: 2)
Australian Antarctic Magazine     Free   (Followers: 4)
Australian Cultural History     Hybrid Journal   (Followers: 11)
Australian Historical Studies     Hybrid Journal   (Followers: 13)
Australian Journal of Legal History     Full-text available via subscription   (Followers: 18)
Australian Journal of Politics & History     Hybrid Journal   (Followers: 14)
Balkanologie : Revue d'Études Pluridisciplinaires     Open Access   (Followers: 4)
Baltic-Pontic Studies     Open Access   (Followers: 1)
Behemoth     Open Access   (Followers: 3)
Berichte Zur Wissenschaftsgeschichte     Hybrid Journal   (Followers: 9)
BIBLOS - Revista do Departamento de Biblioteconomia e História     Open Access   (Followers: 13)
BibNum     Open Access  
Biodiversity and Natural History     Open Access   (Followers: 5)
Biographical Memoirs of Fellows of the Royal Society     Full-text available via subscription   (Followers: 2)
Biography     Full-text available via subscription   (Followers: 17)
Bochumer Philosophisches Jahrbuch für Antike und Mittelalter     Hybrid Journal   (Followers: 2)
Body & Society     Hybrid Journal   (Followers: 22)
Boletim Cearense de Educação e História da Matemática     Open Access  
Book History     Full-text available via subscription   (Followers: 126)
Boom : A Journal of California     Full-text available via subscription   (Followers: 1)
Britain and the World     Hybrid Journal   (Followers: 9)
British Journal for Military History     Open Access   (Followers: 24)
British Journal of Canadian Studies     Hybrid Journal   (Followers: 11)
British Journal of Middle Eastern Studies     Hybrid Journal   (Followers: 26)
British Mycological Society Symposia Series     Full-text available via subscription   (Followers: 1)
British Review of New Zealand Studies     Full-text available via subscription   (Followers: 3)
Bryn Mawr Classical Review     Open Access   (Followers: 39)
BSHM Bulletin: Journal of the British Society for the History of Mathematics     Hybrid Journal   (Followers: 6)
Buildings & Landscapes: Journal of the Vernacular Architecture Forum     Full-text available via subscription   (Followers: 13)
Bulletin d'histoire politique     Full-text available via subscription   (Followers: 3)
Bulletin de la Sabix     Open Access  
Bulletin de Philosophie Medievale     Full-text available via subscription   (Followers: 5)
Bulletin du centre d’études médiévales d’Auxerre     Open Access   (Followers: 6)
Bulletin d’études Orientales     Open Access   (Followers: 10)
Bulletin of Hispanic Studies     Hybrid Journal   (Followers: 13)
Bulletin of Latin American Research     Hybrid Journal   (Followers: 15)
Bulletin of Spanish Studies: Hispanic Studies and Researches on Spain, Portugal and Latin America     Hybrid Journal   (Followers: 25)
Bulletin of the Ecological Society of America     Open Access   (Followers: 4)
Bulletin of the John Rylands Library     Hybrid Journal   (Followers: 12)
Bustan     Hybrid Journal   (Followers: 1)
Byzantine and Modern Greek Studies     Hybrid Journal   (Followers: 12)
Byzantinische Zeitschrift     Hybrid Journal   (Followers: 12)
Byzantion Nea Hellás     Open Access   (Followers: 2)
C@hiers du CRHIDI     Open Access  
Cabo     Full-text available via subscription  
Cadernos de História     Open Access  
CADUS - Revista de Estudos de Política, História e Cultura     Open Access  
Cahiers d'histoire     Full-text available via subscription   (Followers: 2)
Cahiers d'histoire. Revue d'histoire critique     Open Access   (Followers: 14)
Cahiers de l'Urmis     Open Access   (Followers: 1)
Cahiers des études anciennes     Open Access   (Followers: 7)
Cahiers du Centre de recherches historiques     Open Access   (Followers: 9)
Cahiers du Monde Russe     Open Access   (Followers: 11)
Cahiers d’études africaines     Open Access   (Followers: 9)
Cahiers « Mondes anciens »     Open Access   (Followers: 5)
California Italian Studies Journal     Full-text available via subscription   (Followers: 5)
Cambridge Journal of Regions, Economy and Society     Hybrid Journal   (Followers: 11)
Canadian Historical Review     Full-text available via subscription   (Followers: 11)
Canadian Journal of History     Full-text available via subscription   (Followers: 10)
Canadian Journal of Linguistics / La revue canadienne de linguistique     Full-text available via subscription   (Followers: 8)
Canadian Review of American Studies     Full-text available via subscription   (Followers: 1)
Canadian-American Slavic Studies     Hybrid Journal   (Followers: 8)
Caribbean Studies     Full-text available via subscription   (Followers: 12)
Catholic Historical Review     Full-text available via subscription   (Followers: 16)
Cemoti, Cahiers d'études sur la méditerranée orientale et le monde turco-iranien     Open Access   (Followers: 2)
Central Asian Survey     Hybrid Journal   (Followers: 9)
Central Europe     Hybrid Journal   (Followers: 5)
Chaucer Review     Full-text available via subscription   (Followers: 8)
Childhood in the Past : An International Journal     Hybrid Journal   (Followers: 3)
Chinese Studies in History     Full-text available via subscription   (Followers: 9)
Chronica Nova. Revista de Historia Moderna de la Universidad de Granada     Open Access   (Followers: 1)
Chronique d'Egypte     Full-text available via subscription   (Followers: 6)
Church History and Religious Culture     Hybrid Journal   (Followers: 54)
Church History: Studies in Christianity and Culture     Full-text available via subscription   (Followers: 73)
Civil War History     Full-text available via subscription   (Followers: 19)
Cleveland Studies in the History of Art     Full-text available via subscription   (Followers: 2)
CLIO : Revista de Pesquisa Histórica     Open Access  
Clio y Asociados     Open Access  
Clio. Femmes, Genre, Histoire - Articles     Open Access   (Followers: 11)
Clio. Women, Gender, History     Open Access  
Cliodynamics     Open Access  
Collections électroniques de l'INHA     Open Access   (Followers: 1)
Collingwood and British Idealism Studies     Full-text available via subscription   (Followers: 1)
Colonial Latin American Review     Hybrid Journal   (Followers: 9)
Comitatus : A Journal of Medieval and Renaissance Studies     Full-text available via subscription   (Followers: 18)
Comparative Legal History     Full-text available via subscription   (Followers: 7)
Comparative Studies of South Asia, Africa and the Middle East     Full-text available via subscription   (Followers: 20)
Comptabilités     Open Access  
Concorso. Arti e lettere     Open Access  
Conservative Judaism     Full-text available via subscription   (Followers: 5)
Conserveries mémorielles     Open Access  
Contemporaneity : Historical Presence in Visual Culture     Open Access   (Followers: 3)
Contemporary Arab Affairs     Hybrid Journal   (Followers: 4)
Contemporary British History     Hybrid Journal   (Followers: 22)
Contemporary French and Francophone Studies     Hybrid Journal   (Followers: 12)
Convivium     Full-text available via subscription  
Crime, Histoire & Sociétés     Open Access   (Followers: 5)
Critical Historical Studies     Full-text available via subscription   (Followers: 7)
Critique: Journal of Socialist Theory     Hybrid Journal   (Followers: 6)
Cromohs : Cyber Review of Modern Historiography     Open Access  
Crossing Borders : An Interdisciplinary Journal of Undergraduate Scholarship     Open Access   (Followers: 1)
Cuadernos de Historia     Open Access   (Followers: 3)
Cuadernos de historia de España     Open Access   (Followers: 4)
Cuadernos de Historia de la Salud Publica     Open Access  
Cuadernos de Historia del Derecho     Open Access   (Followers: 7)
Cuadernos de Historia Moderna     Open Access   (Followers: 2)
Cuadernos de Ilustración y Romanticismo     Open Access  
Cuban Studies     Full-text available via subscription   (Followers: 6)
Cuicuilco     Open Access   (Followers: 1)
Cultura Histórica & Patrimônio     Open Access  
Cultural and Social History     Full-text available via subscription   (Followers: 43)
Cultural History     Hybrid Journal   (Followers: 23)
Cultural-Historical Psychology     Open Access   (Followers: 1)
Culturas     Open Access   (Followers: 1)
Cultures & conflits     Open Access   (Followers: 11)
Cultures et conflits     Open Access   (Followers: 1)
Czech-Polish Historical and Pedagogical Journal     Open Access  

        1 2 3 4 5 | Last

Journal Cover Acta Amazonica
  [SJR: 0.32]   [H-I: 18]   [4 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 0044-5967
   Published by SciELO Homepage  [717 journals]
  • Phenotypic and genotypic characterization and compatibility among
           genotypes to select elite clones of cupuassu

    • Abstract: ABSTRACT The expansion of the genetic base of cultivated materials is an ongoing activity of the cupuassu (Theobroma grandiflorum) breeding program. However, the parents involved need to be genotypically and phenotypically characterized to ensure compatibility of crossings, as well as to assist in the selection of more promising individuals for hybridization. This study aimed to identify and select T. grandiflorum clones that are compatible and genetically divergent using tools such as the estimates of genotypic, phenotypic, and combined distances, as well as the compatibility rates among clones. The genetic distance analysis of the clones was performed with 14 heterologous microsatellite primers of cocoa (Theobroma cacao) that amplify the DNA of cupuassu. Phenotypic characterization was based on 14 variables related to fruit production. The joint dissimilarity matrix was obtained by means of the sum of the phenotypic and molecular dissimilarity matrices. The intra- and inter-clonal compatibility was estimated through controlled crossings. A low correlation was noted between the dissimilarity matrices based on the molecular and agronomic data. As for compatibility, all clones were self-incompatible, with different compatibility rates when crossed. The compatibility index was strongly influenced by the degree of relationship of the clones. It was possible to identify and select the most promising sets of cupuassu clones to be used in breeding programs, despite their genetic relationship.RESUMO A ampliação da base genética dos materiais de cultivo é trabalho contínuo do programa de melhoramento genético do cupuaçuzeiro (Theobroma grandiflorum). Há necessidade, entretanto, que os parentais envolvidos estejam caracterizados fenotípica e genotipicamente, para auxiliar na escolha dos indivíduos que serão hibridizados, bem como para garantir os mecanismos de rastreabilidade e proteção das cultivares. Este estudo teve como objetivo identificar e selecionar clones de cupuaçuzeiro inter-compatíveis e geneticamente divergentes, utilizando como ferramentas as distâncias genotípica, fenotípica e combinada mistas, assim como as taxas de compatibilidade entre os clones. Estimativas das distâncias genéticas entre os clones foram realizadas com base em 14 iniciadores microssatélites heterólogos de cacaueiro (Theobroma cacao) que amplificam o DNA do cupuaçuzeiro. Para a caracterização fenotípica foram empregadas 14 variáveis ​​relacionadas à produção de frutos. A matriz de dissimilaridade conjunta foi obtida por meio da soma das matrizes de dissimilaridade fenotípica e molecular. A compatibilidade intra e inter-clonal foi estimada através de cruzamentos controlados. Houve uma baixa correlação entre as matrizes de dissimilaridade com base nos dados moleculares e agronômicos. Quanto à compatibilidade, todos os clones foram auto-incompatíveis, contudo, compatíveis entre si, com diferentes taxas. O índice de compatibilidade foi fortemente influenciado pelo grau de relacionamento dos clones. Foi possível identificar e selecionar os conjuntos de clones de cupuaçuzeiro mais promissores para ser usados em melhoramento genético, apesar da ocorrência de relação genética entre eles.
       
  • Genotype selection and addition of fertilizer increases grain yield in
           upland rice in Suriname

    • Abstract: ABSTRACT The upland rice farmers in Suriname use local varieties and low level technologies in the field. As a result, the upland rice grain yield is low, at about 1 000 kg ha-1. Our objective was to evaluate the use of upland rice cultivars from Suriname and Brazil, and the effect of nitrogen, N, phosphorus, P, and potassium, K, fertilizers on cultivation variables. We undertook four field trials in the Victoria Area, in the Brokopondo District, using a randomized block design each with four replications. The most productive rice varieties were BRS Esmeralda (grain yield 2 903 kg ha-1) and BRS Sertaneja (2 802 kg ha-1). The highest grain yield of 2 620 kg ha-1 was achieved with a top dressing application of 76.41 kg N ha-1 20 days after sowing. For P, the highest grain yield of 3 085 kg ha-1 was achieved with application of 98.06 kg ha-1 P2O5 applied at sowing. An application rate of 31.45 kg ha-1 of K2O at sowing achieved the highest grain yield of 2 952 kg ha-1. Together, these application rates of N, P and K resulted in rice grain yield of about 3 000 kg ha-1, which is three times greater than the national average for upland rice. We demonstrate that the use of improved rice varieties matched to the local conditions, and application of appropriate fertilizers, are management practices that can result in significant increases in rice grain yield in Suriname.RESUMO Produtores de arroz de terras altas no Suriname usam cultivares locais e baixo nível tecnológico. Assim, a produtividade é baixa (1 000 kg ha-1). Nosso objetivo foi avaliar o uso de cultivares de arroz de terras altas do Suriname e do Brasil, e o efeito de taxas de nitrogênio, N, fósforo, P e potássio, K sobre variáveis de cultivo. Foram instalados quatro ensaios de campo usando em cada experimento o delineamento de blocos casualizados com quatro repetições. As mais produtivas cultivares de arroz foram BRS Esmeralda (produtividade de 2 903 kg ha-1) e a BRS Sertaneja (2 802 kg ha-1). A mais alta produtividade de grãos de 2 620 kg ha-1 foi alcançada pela aplicação em cobertura de 76.41 kg N ha-1, aos 20 dias após a semeadura. Para P, a mais alta produtividade de grãos de 2 620 kg ha-1 foi alcançada com a aplicação de 98.06 kg ha-1 de P2O5 na semeadura. Uma aplicação da dose de 31.45 kg ha-1 K2O na semeadura permitiu o maior rendimento de grãos, 2 952 kg ha-1. Juntas, essas taxas de aplicação proporcionaram rendimento de grãos de arroz em torno de 3 000 kg ha-1, o que é três vezes maior que a média nacional do país para arroz de terras altas. O uso de variedades melhoradas de arroz adaptadas às condições locais, e a aplicação de doses adequadas de nutrientes são práticas de manejo que podem resultar em significativo aumento no rendimento de cultivos de arroz de terras altas no Suriname.
       
  • Repeatability of biometric and fruit and seed yield traits of sacha inchi

    • Abstract: ABSTRACT Repeatability allows an estimation of the number of evaluations needed to optimize the selection of superior genotypes, with consequent effects on the research costs in terms of financial and human resources. The objective of this study was to estimate the coefficient of repeatability of biometric and yield traits, related to fruits and seeds of sacha inchi (Plukenetia volubilis), and to define the number of evaluations required for an efficient selection and evaluation of genotypes of the species. A total of 37 non-domesticated accessions were evaluated for 19 months in a randomized block design with 5 replications and 2 plants per plot. The total number of fruits, total number of seeds, total fruit weight, mean fruit weight, and number of seeds per fruit of the accessions were evaluated by monthly sampling. Additionally, seed biometry was assessed in a sample of 30 seeds per accession. Repeatability coefficients were estimated by analysis of variance, principal components and structural analysis. The principal component method based on the covariance matrix was the most appropriate for establishing repeatability estimates of sacha inchi, due to the cyclical nature of the crop. Superior genotypes of the species can be selected for yield-related traits with about 90% accuracy, from 5 harvests (months) onwards. To ensure this accuracy level, it would be necessary to evaluate a minimum of 5 and 25 fruits to determine mean fruit weight and number of seeds per fruit, respectively, and 39 seeds would be required to evaluate the biometric traits.RESUMO A repetibilidade permite estimar o número de avaliações para selecionar genótipos superiores com maior eficiência, o que tem reflexo direto sobre os gastos com recursos humanos e financeiros da pesquisa. O objetivo deste trabalho foi estimar o coeficiente de repetibilidade de características biométricas e de produção relacionadas aos frutos e sementes de sacha inchi (Plukenetia volubilis) e definir o número de avaliações necessárias para um eficiente processo de seleção e avaliação de genótipos da espécie. Um total de 37 acessos não domesticados foram avaliados em blocos casualizados com 5 repetições e 2 plantas por parcela durante 19 meses. Colheitas mensais avaliaram o número total de frutos, número total de sementes, peso total de frutos, peso médio de frutos e número de sementes por fruto dos acessos. Adicionalmente, foi realizada a biometria das sementes através de uma amostra de 30 sementes de cada acesso. Os coeficientes de repetibilidade foram estimados por meio dos métodos da análise de variância, componentes principais e análise estrutural. O método de componentes principais com uso da matriz de covariância se mostrou o mais indicado para obtenção de estimativas de repetibilidade em sacha inchi devido ao comportamento cíclico da cultura. Genótipos superiores da espécie podem ser selecionados, com acurácia de 90%, a partir de 5 colheitas (meses) para os caracteres de produtividade. Para mesma acurácia, seria necessária a avaliação de no mínimo 5 e 25 frutos para determinação do peso médio de frutos e número de sementes por fruto, respectivamente, e de 39 sementes para avaliação dos caracteres biométricos.
       
  • Ethnobotanical study of antimalarial plants in the middle region of the
           Negro River, Amazonas, Brazil

    • Abstract: ABSTRACT The middle Rio Negro region is an interesting place to seek novel antimalarial compounds because of the traditional knowledge of the Amazon population in conjunction with the high biodiversity of the region. The objective of this work was to study the use of antimalarial plants in Barcelos, state of Amazonas, Brazil. Fifty-two local specialists from eight different communities were interviewed over one year. The identified plants were collected with the assistance of local specialists, classified to species level and deposited in herbarium. In total, 55 antimalarial plants were identified in use in the region, of which 16 had not been previously reported in other published studies. Many factors could be involved with the use of antimalarial plants by the Barcelos population, such as the accessibility of these medicinal plants, efficiency and safety of using these plants, the accessibility to drugs or other medical treatments, plant bitterness, and the gender of the interviewees. Our results indicate that the population of Barcelos possesses an extensive knowledge on the use of a diverse array of antimalarial plants, and may contribute to the development of novel antimalarial compounds.RESUMO O conhecimento tradicional da população amazônica, associado à grande biodiversidade da região, faz do médio Rio Negro um lugar propício para a pesquisa de novos remédios antimaláricos. O objetivo deste trabalho foi estudar o uso de plantas antimaláricas no município de Barcelos, Amazonas, Brasil. Ao longo de um ano foram entrevistados 52 especialistas de oito comunidades de Barcelos. As plantas indicadas foram coletadas com o auxílio dos especialistas, identificadas e depositadas em herbário. Foram mencionadas 55 plantas antimaláricas, das quais 16 nunca foram citadas em outros trabalhos previamente publicados. Muitos fatores podem estar associados ao uso destas plantas antimaláricas, tais quais o acesso a estas plantas, sua eficiência e segurança, o acesso a outros tratamentos médicos, o amargor das plantas e o gênero das pessoas entrevistadas. Nossos resultados indicam que a população de Barcelos é detentora de um rico conhecimento sobre o uso de plantas medicinais antimaláricas e pode contribuir para o desenvolvimento de novas drogas antimaláricas.
       
  • Assessment of climate change impacts on water resources of the Purus Basin
           in the southwestern Amazon

    • Abstract: ABSTRACT Knowledge about water resources is critical for climate adaptation in face of long-term changes and more frequent extreme events occurrence. During the major droughts of 2005 and 2010, a large epicenter was located in the southwestern Amazon over the Purus River Basin. In this sense, we conducted a hydrological simulation in this basin to assess the climate change impacts on its water resources throughout the 21st century. The water balance was simulated using the Distributed Hydrological Model (MHD-INPE). The future climate projections were simulated by the regional ETA-INPE model driven by a 4-member HadCM3 global model regarding the A1B-AR4/IPCC scenario of greenhouse gases emissions. As simulated by the ETA-INPE/HadCM3, the 4-members mean response for the A1B scenario represents a rainfall reduction of up to 11.1%, a temperature increase of up to 4.4 °C, and a wind speed increase of up to 8.4% in the Purus Basin by the end of 21st century. Under these conditions, the discharge projections represent an overall 27% decrease in the Purus Basin with different patterns between dry and wet season, as well as changes in seasonality trends. The consequences of projected climate change are severe and will probably have a great impact upon natural ecosystem maintenance and human subsistence. In a climate change adaptation process, the preservation of the natural forest cover of the Purus Basin may have great importance in water retention.RESUMO O conhecimento sobre os recursos hídricos é crítico para a adaptação diante das mudanças de longo prazo e ocorrência mais frequente de eventos extremos. Nas grandes secas de 2005 e 2010, um grande epicentro foi localizado no sudoeste da Amazônia sobre a Bacia do Rio Purus. Nesse sentido, foi realizada uma simulação hidrológica nessa bacia, para avaliar os impactos das mudanças climáticas sobre seus recursos hídricos ao longo do século 21. O balanço hídrico foi simulado utilizando o modelo hidrológico distribuído (MHD-INPE). As projeções climáticas futuras foram simuladas pelo modelo regional ETA-INPE forçado por 4 membros do modelo global HadCM3 sobre o cenário de emissões de gases de efeito estufa A1B-AR4/IPCC. Como simulado pelo ETA-INPE/HadCM3, a resposta média dos 4 membros para o cenário A1B representa uma redução de chuvas em até 11,1%, aumento de temperatura em até 4,4 °C, e aumento da velocidade do vento em até 8,4% para a Bacia do Purus até o fim do século 21. Sob essas condições, as projeções de descarga representam uma diminuição global de 27% na Bacia do Purus, com diferentes padrões entre as estações seca e úmida, bem como mudanças nas tendências sazonais. As consequências das mudanças climáticas projetadas são severas e provavelmente terão um grande impacto sobre a manutenção dos ecossistemas naturais e subsistência humana. Em um processo de adaptação a mudanças climáticas, a preservação da cobertura florestal natural da Bacia do Purus pode ter grande importância na retenção de água.
       
  • Home range and habitat use by pacas in a montane tropical forest in
           Bolivia

    • Abstract: ABSTRACT We studied the home range and habitat use of paca (Cuniculus paca) in a rural agricultural community in the Alto Beni region, in La Paz department, Bolivia, where game meat is the main source of protein for a large portion of local inhabitants. We captured and radio collared five individual paca (4 females and 1 male), which were followed for six months in 2012 to estimate home range of the individuals and assess their habitat use and selection. The total mean home range (95% Minimum Convex Polygon) was 2.26 ha (SD = 0.80), and ranged from 1.5 to 2.96 ha. The mean female home range (2.04 ha) was smaller than the male´s (2.95 ha). Pacas used two (crops and fallows) of the three available habitats (secondary forest patches), and appeared to positively select crops over the other two. The importance of crops may be linked to the type of agriculture conducted in the area (i.e. mainly cacao in agroforestry systems), which may offer more food and shelter for pacas. Given that, the importance of habitats may change seasonally; this topic should be examined in future studies. Our results suggest that agroforestry systems may be important for the species since they offer a variety of food resources throughout the year.RESUMEN Hemos estudiado el ámbito de hogar y uso de hábitat del jochi pintado (Cuniculus paca) en una comunidad de Alto Beni en el Norte de La Paz-Bolivia, donde la carne obtenida por cacería es, como en muchas regiones de la Amazonia, una fuente principal de proteína para muchas poblaciones indígenas y campesinas. Hemos capturado y seguido con radio-collar a cinco individuos (4 hembras y 1 macho) por seis meses en 2012. El ámbito de hogar promedio de los individuos fue de 2,26 ha (ds=0,80), usando el estimador Mínimo Polígono Convexo (MPC al 95%) y los valores se encuentran entre 1,5 a 2,96 ha. El ámbito de hogar promedio de las hembras fue más pequeño (2,04 ha) que del macho (2,95 ha). Los jochis estudiados usaron 2 (cultivos y barbechos) de los 3 hábitats disponibles (parches de bosque secundario), aunque los cultivos parecen ser seleccionados positivamente respecto a los otros dos. La importancia de los cultivos podría estar ligada al tipo de cultivo que se realiza en la zona (sistemas agroforestales), que podrían estar ofreciendo mejores condiciones para ser usados por los jochis. Adicionalmente, la importancia de los hábitats podría cambiar de acuerdo a la época del año, lo cual podría ser abordado en siguientes estudios. Este trabajo es el primero en dar detalles sobre la ecología de C. paca en vida silvestre en Bolivia; sin embargo sería necesario contar con más individuos para tener más detalle sobre la ecología espacial de esta especie.
       
  • Understory host plant and insect gall diversity changes across topographic
           habitats differing in nutrient and water stress in the Brazilian Amazon
           rainforest

    • Abstract: ABSTRACT Topographic gradients in terra firme forests are associated with pronounced changes in soil texture, soil nutrients and distance to the water-table, thereby creating different hydric and nutritional conditions for plants and their associated herbivore community. The aim of this study was to investigate galling species and host plant richness and gall species composition across topographic habitats differing in nutrient and water stress in the Brazilian Amazon rainforest. Nineteen 250 x 3 m plots were randomly sampled in the valley, slope, plateau-slope transition, and plateau habitats in terra firme forests. All individual dicotyledonous plants 1 to 3 meters high were examined for the presence of insect galls. Galling species and host plant richness differed significantly among the studied habitats and were higher in slope habitats (drier habitats), as expected. More humid areas (valleys) showed the lowest richness of galling species, and a lower number of understory host plants. PERMANOVA and PERMDISP results demonstrated that the gall species composition differed significantly in the valley, slope, plateau-slope transition, and plateau areas. However, these structural differences in species composition could be due to unequal dispersion of variability among forest habitats. Our data suggested that spatial heterogeneity, such as a mosaic of local water status and nutrient availability resulting from the topographic conditions, can affect host plants and their associated galling insects.RESUMO As variações topográficas encontradas nas florestas de terra firme são acompanhadas por fortes mudanças no conteúdo de argila e concentração de nutrientes do solo, criando, portanto, diferentes condições hídricas e nutricionais para plantas e as comunidades de herbívoros associadas. O objetivo do presente estudo foi avaliar a riqueza e composição de espécies de insetos galhadores e suas plantas hospedeiras ao longo de um gradiente topográfico com habitats que diferem quanto ao estresse hídrico e nutricional. Dezenove parcelas de 250 x 3 m foram estabelecidos aleatoriamente em habitats de vertente, platô, transição platô-vertente e baixio, claramente distintos em áreas de terra firme. Todas as dicotiledôneas com 1 a 3 metros de altura foram examinadas quanto à presença de galhas de insetos. As galhas encontradas foram coletadas e insetos galhadores foram classificados em morfoespécies. A riqueza de galhadores e de plantas hospedeiras diferiram significativamente entre os habitats estudados, e como esperado, foi maior no habitat de vertente. As áreas mais úmidas (baixios) apresentaram menor riqueza de plantas hospedeiras no sub-bosque e, conseqüentemente, um número menor de espécies de galhadores. Os resultados das análises de PERMANOVA e PERMDISP demonstraram que a composição da espécie de insetos galhadores variou significativamente entre as áreas de floresta de terra firme. No entanto, essas diferenças estruturais na composição das espécies podem ser devidas à dispersão desigual da variabilidade entre os habitats. Nossos dados sugerem que a heterogeneidade espacial, tal como o mosaico de status hídrico e nutricional do solo associado às condições topográficas, pode afetar plantas hospedeiras e insetos galhadores associados.
       
  • A critical assessment of INPA’s scientific cooperation based on
           publications from 2004 to 2014

    • Abstract: ABSTRACT In the 1990s, scientific cooperation at the National Institute for Amazonian Research (Instituto Nacional de Pesquisas da Amazônia - INPA), one of the oldest research institutions in Amazonia with the highest regional international cooperation, was dominated by research conducted by INPA’s foreign partners. In this article, the evolution of this situation is evaluated, with the hypothesis that, as the internal and the external environments have changed over the past decade, this should be reflected in more symmetrical research cooperation. The analysis was based on a 2004 to 2014 Web of Science search of scientific production at INPA, from which 786 papers were recovered. The results indicated an increase in scientific production but without a corresponding increase in symmetrical cooperation. The level of symmetry varied according to the type of cooperation; it increased when Brazilian institutions were exclusively involved, although these papers tended to be published in journals with a low impact factor. However, the scientific relationships remained relatively asymmetrical when only foreign institutions were involved, although these papers were published in journals with high impact factors. Network analyses indicated that most international scientific cooperation was concentrated in just two INPA research departments: Biodiversity and Environmental Dynamics. In contrast, INPA’s other two research departments, Technology & Innovation and Society, Environment & Health were peripheral, fragmented and benefited little from international cooperation.RESUMO Na década de 1990, a cooperação científica no Instituto Nacional de Pesquisas Amazônica (INPA), uma das instituições de pesquisa mais antigas da Amazônia e que concentra grande parte da cooperação internacional regional, foi dominada por pesquisas realizadas pelos parceiros estrangeiros do INPA. Neste artigo, a evolução desta situação é avaliada, com a hipótese de que, à medida que os ambientes interno e externo mudaram ao longo da última década, isso deve refletir-se em uma cooperação cientifica mais simétrica. A análise baseou-se em um levantamento da produção científica do INPA na Web of Science de 2004 a 2014, em que foram recuperados 786 documentos. Os resultados indicaram um aumento na produção científica, mas sem um aumento correspondente na simetria da cooperação. O nível de simetria variou de acordo com o tipo de cooperação; aumentou quando estavam envolvidas exclusivamente instituições brasileiras, embora esses artigos tenham sido publicados em revistas com baixo fator de impacto. No entanto, as relações científicas permaneceram relativamente assimétricas quando apenas instituições estrangeiras estavam envolvidas, embora esses trabalhos tenham sido publicados em revistas com fatores de impacto mais altos. As análises de rede indicaram que a maior parte da cooperação científica internacional se concentrou em apenas dois departamentos de pesquisa do INPA: Biodiversidade e Dinâmica Ambiental. Em contraste, os outros dois departamentos de pesquisa do INPA, Tecnologia & Inovação e Sociedade, Ambiente & Saúde foram periféricos, fragmentados e pouco se beneficiaram da cooperação internacional.
       
  • Amphibians and reptiles from Floresta Nacional de Pau-Rosa, Amazonas,
           Brazil: an important protected area at the heart of Amazonia

    • Abstract: ABSTRACT Amazonia harbors the largest and most diverse tropical forest in the world, but knowledge about the species diversity of the region is still far from ideal. Given this low level of faunal and floral knowledge, we present an annotated list of the species of amphibians and reptiles found in Floresta Nacional do Pau-Rosa (FNPR), along the Rio Paraconi, municipality of Maués, state of Amazonas, Brazil. Herpetofauna of the FNPR was sampled with pitfall traps, active search and occasional encounters from February 18 to March 28, 2009. A total of 270 specimens were collected, representing 39 species of amphibians and 24 species of reptiles. At least seven of the species collected at FNPR represented, at the time, unnamed taxa (four of which have now been named). The number of taxa collected and the high number of unnamed taxa highlight the importance of this area in terms of biodiversity and as a priority for conservation. We also discuss about the amphibian diversity in Amazonia.RESUMO A Amazônia engloba a maior e mais diversa floresta tropical do mundo, mas o conhecimento sobre a diversidade de espécies da região ainda está longe do ideal. Apresentamos aqui uma lista comentada das espécies de anfíbios e répteis encontradas na Floresta Nacional de Pau-Rosa (FNPR), ao longo do Rio Paraconi, município de Maués, estado do Amazonas, Brasil. Espécimes da FNPR foram coletados com armadilhas de queda, busca ativa e encontros ocasionais de 18 fevereiro a 28 março de 2009. Um total de 270 espécimes foram coletados, o que representou 39 espécies de anfíbios e 24 espécies de répteis. Pelo menos sete das espécies coletadas na FNPR representaram, na época, táxons sem nome (quatro dos quais já foram nomeados). O número de exemplares recolhidos e o elevado número de táxons destaca a importância desta área em termos de biodiversidade e como uma área prioritária para a conservação. Nós também discutimos a diversidade de anfíbios na Amazônia.
       
  • Nestling development of the tropical screech-owl ( Megascops choliba ): a
           successful case report from the southwestern Amazon

    • Abstract: ABSTRACT This study reports a successful reproductive event in Megascops choliba in eastern Acre, northern Brazil. An active M. choliba nest was monitored from the hatching of the eggs to the departure of the nestlings. Once hatched, the nestlings were weighed every two days to verify their weight gain over time. The nestlings remained in the nest for 30 days. The pattern of weight gain was similar to that found in other birds, presenting a rapid increase over the first 15 days, followed by a drastic reduction in the mean growth rate during the second half of the development period. Our observations indicate that the breeding season of M. choliba in southwestern Amazonia is similar as that reported for the species in the northern hemisphere. These are the first data on this species from this region, and contribute to the understanding of its reproductive biology within its geographic range.RESUMO Este estudo refere-se a um caso bem sucedido de reprodução de Megascops choliba no leste do estado do Acre. Um ninho ativo de M. choliba foi acompanhado desde a eclosão até o abandono dos filhotes. A partir da eclosão, os filhotes foram pesados a cada dois dias. O tempo de permanência dos filhotes no ninho foi de 30 dias. O ganho de peso dos filhotes seguiu o padrão encontrado em outros estudos com aves, ou seja, um rápido aumento de peso nos primeiros 15 dias e uma redução drástica da taxa média de crescimento na segunda metade do período de desenvolvimento. Nossas observações indicam que o período reprodutivo de M. choliba no sudoeste amazônico deve ser o mesmo relatado para a espécie no hemisfério norte. Os dados apresentados aqui são inéditos para a região e contribuem para o entendimento da biologia reprodutiva desta espécie ao longo de sua distribuição geográfica.
       
  • Agronomic efficiency of Rhizobium strains from the Amazon region
           in common bean

    • Abstract: ABSTRACT To maximize the contribution of biological nitrogen fixation in common bean, it is necessary to use bacterial strains that are more adapted, competitive, and efficient in the symbiotic process. In this regard, the aim of this study was to evaluate the agronomic efficiency (AE) of three bacterial strains isolated from acid soils with high Al content from the Amazon region in an Argissolo Vermelho Distrófico típico soil (Typic Rhodustults - USDA Classification) from the municipality of Formiga, MG, Brazil. We compared their AE to that of the reference strain CIAT 899T and of two controls without inoculation (one without and another with 80 kg ha-1 of N-urea). The results indicated that inoculation with the strains UFLA 02-100 and UFLA 02-127 provides grain yield equivalent to inoculation with the reference strain and to the control with mineral N. Thus, both have potential for recommendation as inoculants for common bean.RESUMO Para maximizar a contribuição da fixação biológica de nitrogênio no feijoeiro-comum é necessária a utilização de estirpes de bactérias mais adaptadas, competitivas e eficientes no processo simbiótico. Nesse sentido, objetivou-se avaliar, em um Argissolo Vermelho Distrófico típico do município de Formiga-MG, a eficiência agronômica (EA) de três estirpes isoladas de solos ácidos e com alto teor de Al da Amazônia e comparar suas EA à da estirpe referência CIAT 899T e à de dois controles sem inoculação (um sem e outro com 80 kg ha-1 of N-ureia). Os resultados indicaram que a inoculação com as estirpes UFLA 02-100 e UFLA 02-127 propicia rendimento de grãos equivalente ao da estirpe referência e ao do controle com N mineral e que por isso, ambas têm potencial para ser recomendadas como inoculantes para o feijoeiro-comum.
       
  • Temporal progress of teak rust in a tropical area of Tocantins State,
           Brazil

    • Abstract: ABSTRACT Rust, caused by Olivea neotectonae, stands out as the main teak disease, causing premature defoliation regardless of the tree’s growth stage. In this study, we aimed to assess the temporal progress of rust in adult teak plants in southern Tocantins State (Brazil). Both rust incidence and severity were evaluated and the disease progress curves were obtained, adjusting to monomolecular, logistic and Gompertz mathematical models. Data from incidence and severity were correlated with climate variables collected by the agrometeorological station located in the study area. Rust incidence reached 100% at 98 days after beginning of the evaluations (DBE). The highest severity (equal or above 75%) was observed at 147 DBE. There was a significant and negative correlation between severity and minimum temperature. The adjustment of the Gompertz model suggests that control measures should be aimed primarily to reduce the rate of disease progress.RESUMO A ferrugem, causada por Olivea neotectonae, destaca-se como principal doença da teca, causando desfolha prematura em todos os estádios fenológicos da cultura. O objetivo do estudo foi avaliar o progresso temporal da ferrugem em plantas adultas de teca no sul do Estado do Tocantins. Avaliaram-se a incidência e severidade da ferrugem (escala de notas) e obtiveram-se curvas de progresso da doença, que foram ajustadas aos modelos matemáticos monomolecular, logístico e Gompertz. Correlacionaram-se os dados de incidência e severidade com as variáveis climáticas coletadas na estação meteorológica, localizada na região do estudo. A incidência da ferrugem atingiu 100% aos 98 dias a partir do início das avaliações (DIA). A maior severidade (igual ou acima de 75%) foi observada aos 147 DIA. Houve correlação negativa e significativa entre severidade e temperatura mínima. O ajuste ao modelo de Gompertz sugere que medidas de controle devem ser tomadas objetivando reduzir a taxa de progresso da doença.
       
 
 
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