Subjects -> HISTORY (Total: 1721 journals)
    - HISTORY (1003 journals)
    - History (General) (57 journals)
    - HISTORY OF AFRICA (72 journals)
    - HISTORY OF ASIA (71 journals)
    - HISTORY OF AUSTRALASIA AREAS (10 journals)
    - HISTORY OF EUROPE (260 journals)
    - HISTORY OF THE AMERICAS (187 journals)
    - HISTORY OF THE NEAR EAST (61 journals)

HISTORY (1003 journals)                  1 2 3 4 5 6 | Last

Showing 1 - 200 of 452 Journals sorted alphabetically
40 [degrees] South     Full-text available via subscription   (Followers: 5)
Aboriginal History     Full-text available via subscription   (Followers: 13)
Abstracta Iranica     Open Access   (Followers: 17)
Acadiensis : Journal of the History of the Atlantic Region / Acadiensis : revue d'histoire de la region Atlantique     Open Access   (Followers: 5)
Accounting History Review     Hybrid Journal   (Followers: 24)
Acta Amazonica     Open Access   (Followers: 7)
Acta Historiae Artium     Full-text available via subscription   (Followers: 4)
Acta Musei Nationalis Pragae - Historia litterarum     Open Access  
Acta Orientalia     Full-text available via subscription   (Followers: 22)
Actas y Comunicaciones del Instituto de Historia Antigua y Medieval     Open Access   (Followers: 4)
Actes d'Història de la Ciència i de la Tècnica     Open Access   (Followers: 1)
Administory : Journal for the History of Public Administration / Zeitschrift für     Open Access   (Followers: 2)
Advances in Historical Studies     Open Access   (Followers: 12)
Advances in Software Engineering     Open Access   (Followers: 11)
Africa Confidential     Hybrid Journal   (Followers: 36)
Africa Research Bulletin: Political, Social and Cultural Series     Hybrid Journal   (Followers: 25)
Africa Today     Full-text available via subscription   (Followers: 23)
African and Asian Studies     Hybrid Journal   (Followers: 22)
African Diaspora     Open Access   (Followers: 10)
African Historical Review     Hybrid Journal   (Followers: 20)
African Natural History     Open Access   (Followers: 4)
Agora     Full-text available via subscription   (Followers: 6)
Agricultural History Review     Full-text available via subscription   (Followers: 14)
AIEMH : Revista de la Asociación Internacional para el Estudio de Manuscritos Hispánicos     Open Access  
Akroterion     Full-text available via subscription   (Followers: 6)
Al-Masaq: Islam and the Medieval Mediterranean     Hybrid Journal   (Followers: 29)
albuquerque : revista de história     Open Access  
Almagest     Full-text available via subscription  
Altorientalische Forschungen     Hybrid Journal   (Followers: 11)
American Archivist     Hybrid Journal   (Followers: 273)
American Communist History     Hybrid Journal   (Followers: 21)
American Jewish History     Full-text available via subscription   (Followers: 18)
American Nineteenth Century History     Hybrid Journal   (Followers: 30)
American Periodicals : A Journal of History, Criticism, and Bibliography     Full-text available via subscription   (Followers: 11)
American Review of Canadian Studies     Hybrid Journal   (Followers: 7)
American Studies     Open Access   (Followers: 25)
Amérique Latine Histoire et Mémoire     Open Access   (Followers: 2)
Amsterdamer Beitrage zur alteren Germanistik     Full-text available via subscription   (Followers: 4)
Anadolu Araştırmaları     Open Access  
Anais do Museu Paulista : História e Cultura Material     Open Access  
Analecta Bollandiana     Full-text available via subscription   (Followers: 2)
Anales de Historia Antigua, Medieval y Moderna     Open Access   (Followers: 5)
Anales de Historia del Arte     Open Access   (Followers: 6)
Anatolica     Full-text available via subscription   (Followers: 14)
Ancient Civilizations from Scythia to Siberia     Hybrid Journal   (Followers: 16)
Ancient History : Resources for Teachers     Full-text available via subscription   (Followers: 12)
Ancient Mesoamerica     Hybrid Journal   (Followers: 13)
Anglican Historical Society Journal     Full-text available via subscription   (Followers: 5)
Anglo-Saxon England     Hybrid Journal   (Followers: 38)
Annales historiques de la Révolution française     Open Access   (Followers: 11)
Annales Universitatis Mariae Curie-Skłodowska, sectio F – Historia     Open Access   (Followers: 4)
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: 7)
Annual Bulletin of Historical Literature     Hybrid Journal   (Followers: 12)
ANQ: A Quarterly Journal of Short Articles, Notes, and Reviews     Hybrid Journal   (Followers: 1)
Antike und Abendland     Hybrid Journal   (Followers: 12)
Antiteses     Open Access  
Anuario de Estudios Atlánticos     Open Access   (Followers: 1)
Anuario de Historia de la Iglesia     Open Access   (Followers: 2)
Anuario de la Escuela de Historia     Open Access  
Anuario del Centro de Estudios Históricos "Prof. Carlos S. A. Segreti"     Open Access   (Followers: 2)
Anuario del Departamento de Historia y Teoría del Arte     Open Access  
Arabian Humanities     Open Access   (Followers: 7)
Arabica     Hybrid Journal   (Followers: 13)
ARAM Periodical     Full-text available via subscription   (Followers: 4)
Araucaria. Revista Iberoamericana de Filosofía, Política y Humanidades     Open Access   (Followers: 1)
Arbeiderhistorie     Full-text available via subscription  
Archeion     Full-text available via subscription   (Followers: 1)
ArcheoArte. Rivista Elettronica di Archeologia e Arte     Open Access   (Followers: 10)
Architectural Heritage     Hybrid Journal   (Followers: 26)
Architectural History     Hybrid Journal   (Followers: 5)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 8)
Archives Internationales d'Histoire des Sciences     Partially Free   (Followers: 6)
Archives of Natural History     Hybrid Journal   (Followers: 8)
Archivos de historia del movimiento obrero y la izquierda     Open Access   (Followers: 2)
Area     Hybrid Journal   (Followers: 17)
Arenal. Revista de historia de las mujeres     Open Access   (Followers: 1)
Argumenta Historica     Open Access  
Aristotelian Society Supplementary Volume     Hybrid Journal   (Followers: 2)
Arizona Journal of Hispanic Cultural Studies     Full-text available via subscription   (Followers: 6)
Armstrong Undergraduate Journal of History     Open Access  
Art History     Full-text available via subscription   (Followers: 351)
Art History & Criticism     Open Access   (Followers: 9)
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: 9)
Asia Pacific Journal of Education     Hybrid Journal   (Followers: 25)
Asia-Pacific Journal : Japan Focus     Open Access   (Followers: 15)
Asian Journal of Social Psychology     Hybrid Journal   (Followers: 6)
Asian Perspectives     Full-text available via subscription   (Followers: 11)
Asian Philosophy: An International Journal of the Philosophical Traditions of the East     Hybrid Journal   (Followers: 8)
Asian Review of World Histories     Hybrid Journal   (Followers: 2)
Asian Studies Review     Hybrid Journal   (Followers: 23)
Aspasia     Full-text available via subscription  
Astérion     Open Access   (Followers: 1)
Atrio : Revista de Historia del Arte     Open Access  
Audens : revista estudiantil d'anàlisi interdisciplinària     Open Access  
Aurora Journal     Full-text available via subscription  
Austral Ecology     Hybrid Journal   (Followers: 16)
Australasian Journal of Irish Studies, The     Full-text available via subscription   (Followers: 10)
Australasian Review of African Studies, The     Full-text available via subscription   (Followers: 2)
Australian Antarctic Magazine     Free   (Followers: 5)
Australian Cultural History     Hybrid Journal   (Followers: 12)
Australian Historical Studies     Hybrid Journal   (Followers: 18)
Australian Journal of Legal History     Full-text available via subscription   (Followers: 17)
Australian Journal of Politics & History     Hybrid Journal   (Followers: 18)
Australian Slavonic and East European Studies     Open Access   (Followers: 7)
Austrian History Yearbook     Full-text available via subscription   (Followers: 11)
BAETICA : Estudios de Historia Moderna y Contemporánea     Open Access   (Followers: 1)
Bajo Guadalquivir y Mundos Atlánticos     Open Access   (Followers: 1)
Balkanologie : Revue d'Études Pluridisciplinaires     Open Access   (Followers: 5)
Baltic-Pontic Studies     Open Access   (Followers: 3)
Baroque     Open Access   (Followers: 2)
Behemoth     Open Access   (Followers: 3)
Berichte Zur Wissenschaftsgeschichte     Hybrid Journal   (Followers: 10)
BIBLOS - Revista do Departamento de Biblioteconomia e História     Open Access   (Followers: 7)
BibNum     Open Access  
Biographical Memoirs of Fellows of the Royal Society     Full-text available via subscription   (Followers: 1)
Biography     Full-text available via subscription   (Followers: 23)
Biuletyn Historii Wychowania     Open Access  
Bochumer Philosophisches Jahrbuch für Antike und Mittelalter     Hybrid Journal   (Followers: 5)
Body & Society     Hybrid Journal   (Followers: 29)
Boletim Cearense de Educação e História da Matemática     Open Access  
Boletim do Arquivo da Universidade de Coimbra     Open Access  
Book History     Full-text available via subscription   (Followers: 194)
Boom California     Open Access   (Followers: 1)
Britain and the World     Hybrid Journal   (Followers: 8)
British Catholic History     Hybrid Journal   (Followers: 4)
British Journal for Military History     Open Access   (Followers: 40)
British Journal for the History of Mathematics     Hybrid Journal  
British Journal for the History of Science     Hybrid Journal   (Followers: 34)
British Journal of Canadian Studies     Hybrid Journal   (Followers: 14)
British Journal of Middle Eastern Studies     Hybrid Journal   (Followers: 35)
British Mycological Society Symposia Series     Full-text available via subscription   (Followers: 1)
British Review of New Zealand Studies     Full-text available via subscription   (Followers: 5)
Bryn Mawr Classical Review     Open Access   (Followers: 54)
BSAA arte     Open Access  
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: 16)
Bulletin d'histoire politique     Full-text available via subscription   (Followers: 5)
Bulletin de la Sabix     Open Access  
Bulletin de Philosophie Medievale     Full-text available via subscription   (Followers: 3)
Bulletin du centre d’études médiévales d’Auxerre     Open Access   (Followers: 5)
Bulletin d’études Orientales     Open Access   (Followers: 10)
Bulletin of Hispanic Studies     Hybrid Journal   (Followers: 13)
Bulletin of Latin American Research     Hybrid Journal   (Followers: 20)
Bulletin of Spanish Studies: Hispanic Studies and Researches on Spain, Portugal and Latin America     Hybrid Journal   (Followers: 36)
Bulletin of the Ecological Society of America     Open Access   (Followers: 4)
Bulletin of the John Rylands Library     Hybrid Journal   (Followers: 20)
Bulletin of the School of Oriental and African Studies     Hybrid Journal   (Followers: 24)
Bustan     Hybrid Journal  
Byzantine and Modern Greek Studies     Hybrid Journal   (Followers: 13)
Byzantinische Zeitschrift     Hybrid Journal   (Followers: 17)
Byzantion Nea Hellás     Open Access   (Followers: 3)
C@hiers du CRHIDI     Open Access  
Cabo     Full-text available via subscription  
Cadernos CERU     Open Access   (Followers: 3)
Cadernos de História     Open Access  
Cadernos de História UFPE     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: 8)
Cahiers du Centre de recherches historiques     Open Access   (Followers: 6)
Cahiers du Monde Russe     Open Access   (Followers: 11)
Cahiers d’études africaines     Open Access   (Followers: 10)
Cahiers « Mondes anciens »     Open Access   (Followers: 5)
California Italian Studies Journal     Full-text available via subscription   (Followers: 8)
Cambridge Journal of Regions, Economy and Society     Hybrid Journal   (Followers: 14)
Camden Fifth Series     Full-text available via subscription   (Followers: 3)
Canadian Historical Review     Full-text available via subscription   (Followers: 14)
Canadian Journal of History     Full-text available via subscription   (Followers: 12)
Canadian Journal of Linguistics / La revue canadienne de linguistique     Full-text available via subscription   (Followers: 9)
Canadian Review of American Studies     Full-text available via subscription   (Followers: 3)
Canadian-American Slavic Studies     Hybrid Journal   (Followers: 7)
Caribbean Studies     Full-text available via subscription   (Followers: 12)
Catholic Historical Review     Full-text available via subscription   (Followers: 21)
Cemoti, Cahiers d'études sur la méditerranée orientale et le monde turco-iranien     Open Access   (Followers: 3)
Central Asian Survey     Hybrid Journal   (Followers: 11)
Central Europe     Hybrid Journal   (Followers: 10)
Central European History     Full-text available via subscription   (Followers: 35)
Chaucer Review     Full-text available via subscription   (Followers: 7)
Childhood in the Past : An International Journal     Hybrid Journal   (Followers: 5)
Chinese Studies in History     Full-text available via subscription   (Followers: 10)
Chronica Nova. Revista de Historia Moderna de la Universidad de Granada     Open Access   (Followers: 2)
Chronique d'Egypte     Full-text available via subscription   (Followers: 5)
Church History : Studies in Christianity and Culture     Full-text available via subscription   (Followers: 81)
Church History and Religious Culture     Hybrid Journal   (Followers: 59)
Cihannuma : Journal of History and Geography Studies     Open Access  
Circe de clásicos y modernos     Open Access  
Civil War History     Full-text available via subscription   (Followers: 21)
Cleveland Studies in the History of Art     Full-text available via subscription   (Followers: 2)
Clío & Asociados : La Historia Enseñada     Open Access  
CLIO : Revista de Pesquisa Histórica     Open Access  
Clio. Femmes, Genre, Histoire - Articles     Open Access   (Followers: 11)
Clio. Women, Gender, History     Open Access   (Followers: 9)
Cliodynamics     Open Access   (Followers: 2)
Collections électroniques de l'INHA     Open Access   (Followers: 1)

        1 2 3 4 5 6 | Last

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Acta Amazonica
Journal Prestige (SJR): 0.36
Citation Impact (citeScore): 1
Number of Followers: 7  

  This is an Open Access Journal Open Access journal
ISSN (Print) 0044-5967
Published by SciELO Homepage  [911 journals]
  • Photosynthesis, growth, and survival in seedlings of four tropical
           fruit-tree species under intense radiation

    • Abstract: ABSTRACT In the Amazon region, agroforestry systems (AFSs) are recommended as a sustainable production alternative for local communities. A common component in Amazonian AFSs are tropical fruit trees, which can form the canopy or grow in the understory. In this study, we evaluated the effect of high radiation on photosynthesis, growth and seedling survival of four Amazonian fruit-tree species: Theobroma cacao, Eugenia stipitata, Inga edulis and Psidium guajava. Growth, chlorophyll fluorescence, gas exchange, and leaf pigments were measured in seedlings of each species grown for 12 months inside shade houses with low (8%), medium (30%) and high relative illumination (100%). Eugenia stipitata and T. cacao had the lowest acclimation capacity to high solar radiation, followed by I. edulis. Therefore, these species must be grown under intermediate light levels in early growth stages, to protect them from direct sunlight. In contrast, P. guajava seedlings demonstrated high tolerance to elevated radiation, therefore, this species can be planted under full sunlight.RESUMEN En la región amazónica, los sistemas agroforestales (SAFs) se recomiendan como una alternativa de producción sustentable para las comunidades locales. Un componente común en los SAFs amazónicos son los árboles frutales tropicales, que pueden formar parte del dosel o crecer en el sotobosque. En este trabajo, estudiamos el efecto de la radiación alta sobre la fotosíntesis, el crecimiento y la supervivencia de cuatro especies de árboles frutales amazónicos: Theobroma cacao, Eugenia stipitata, Inga edulis y Psidium guajava. Se midieron el crecimiento, fluorescencia de clorofila, intercambio de gases y pigmentos foliares en plántulas de cada especie que crecieron durante 12 meses dentro de casa-mallas en baja (8%), media (30%) y alta iluminación relativa (100%). Eugenia stipitata y T. cacao tuvieron la menor capacidad de aclimatación a la radiación solar alta, seguidas por I. edulis. En consecuencia, esas especies deben sembrarse bajo niveles de luz intermedia, para protegerlas del sol directo en las etapas iniciales de crecimiento. En contraste, las plántulas de P. guajava mostraron alta tolerancia a la elevada radiación solar, por lo que esta especie puede ser plantada bajo libre exposición solar.
       
  • Characterization of Pseudomonas bacteria of Piper tuberculatum regarding
           the production of potentially bio-stimulating compounds for plant growth

    • Abstract: ABSTRACT Despite advances in the identification and characterization of endophytic bacteria in various plant species worldwide, little is known about such microorganisms in plants from the Amazon region. Previous studies reported that Piper tuberculatum endophytic Pseudomonas (isolates Pt12 and Pt13, identified as Pseudomonas putida and Pseudomonas sp., respectively) were able to inhibit the in vitro growth of Fusarium solani f. sp. piperis, which causes root rot in black pepper (Piper nigrum), and that Pt13 promoted the growth of P. nigrum. Therefore, the aim here was to characterize these bacteria regarding their ability to produce plant growth-promoting substances [siderophores, indol acetic acid (IAA) and soluble phosphate]. Chrome azurol S assays were performed for the detection of siderophores. For qualitative and quantitative assays of IAA production and phosphate solubilization, Salkowski´s reagent and NBRIP medium with molybdenum blue reagent, respectively, were used. Results revealed that Pt12 and Pt13 were able to synthesize IAA, mainly under a high concentration of L-tryptophan, indicating that they are IAA-producing bacteria, probably through a tryptophan-dependent biosynthesis pathway. The presence of P. nigrum extract positively influenced the IAA production by Pt12 and Pt13, with highest values of 125 and 90 µg mL-1, respectively. In addition, Pt12 was positive for the production of siderophores and produced 56.56 µg mL-1 of soluble phosphate. In contrast, Pt13 showed no ability to produce siderophores or to solubilize phosphate. Besides their potential in controlling plant diseases, Pt12 and Pt13 have potential as biofertilizers, favoring sustainable agriculture.RESUMO Apesar dos avanços na identificação e caracterização de bactérias endofíticas em espécies vegetais em todo o mundo, pouco se sabe sobre esses microrganismos em plantas da região amazônica. Estudos anteriores mostraram que Pseudomonas de Piper tuberculatum (isolados Pt12 e Pt13, identificados como Pseudomonas putida e Pseudomonas sp., respectivamente) são capazes de inibir Fusarium solani f. sp. piperis, que causa a podridão das raízes da pimenteira-do-reino (Piper nigrum), e que Pt13 promoveu o crescimento de P. nigrum. Portanto, o objetivo do presente trabalho foi caracterizar essas bactérias quanto à capacidade de produzir substâncias potencialmente bioestimulantes para o crescimento vegetal [sideróforos, ácido indol acético (AIA) e fosfato solúvel]. Ensaios de Cromo Azurol S foram realizados para detecção de sideróforos. Para os ensaios qualitativos e quantitativos de produção de AIA e solubilização de fosfato, foram utilizados o reagente de Salkowski e o meio NBRIP com azul de molibdênio, respectivamente. Os resultados revelaram que Pt12 e Pt13 sintetizaram AIA, principalmente sob alta concentração de L-triptofano, indicando que provavelmente utilizam uma via de biossíntese dependente deste aminoácido. A presença do extrato de P. nigrum influenciou positivamente a produção de AIA por Pt12 e Pt13, com valores máximos de 125 e 90 µg mL-1, respectivamente. Além disso, Pt12 foi positiva para produção de sideróforos e produziu 56.56 µg.mL-1 de fosfato solúvel. Em contraste, Pt13 não produziu sideróforos, nem solubilizou fosfato. Além do potencial de controle de doenças de plantas, Pt12 e Pt13 têm potencial como biofertilizantes, favorecendo a agricultura sustentável.
       
  • Growth and survival over ten years of Brazil-nut trees planted in three
           anthropogenic habitats in northern Amazonia

    • Abstract: ABSTRACT We examined the growth and survival of Brazil-nut trees, Bertholletia excelsa (Lecythidaceae) under different environmental conditions and levels of canopy openness within experimental plantations in the Trombetas River valley, in northern Brazil. We planted 144 seedlings in three anthropogenic habitats with different levels of sunlight exposition: crop field (100% canopy opening), shrub fallow (20-80% canopy opening) and Brazil-nut forest (< 10% canopy opening). We measured plant height and diameter annually and recorded mortality and resprouting over ten years. The performance of B. excelsa differed significantly among habitats, with the highest growth rate observed at the highest level of canopy openness (crop field). Survival was highest in crop field (85%) and shrub fallow (63%) and lowest in Brazil-nut forest (17%). Resprouting capacity was higher in the crop field, as Brazil-nut plants recovered after fire episodes, with most plants resprouting more than one shoot. Some trees in the crop field began to produce flowers and fruits at 9-10 years. We showed that B. excelsa juveniles are light-demanding, with higher survival and growth under conditions of high light exposure. We suggest the use of Brazil-nut trees for reforestation, restoration of degraded lands and enrichment of secondary vegetation, as long as an adequate management is adopted (e.g., maintaining plants exposed to direct sunlight and control of competing pioneer species).RESUMO No presente estudo analisamos o crescimento e a sobrevivência da castanheira, Bertholletia excelsa (Lecythidaceae) em diferentes condições ambientais e níveis de abertura de dossel em plantações experimentais localizadas na bacia do Rio Trombetas, na Amazônia oriental brasileira. Plantamos 144 mudas em habitats antrópicos com diferentes intensidades de luz: roçados recentemente abandonados (100% de abertura de dossel), capoeira de 2-3 anos (20-80% de abertura de dossel) e castanhal maduro (< 10% de abertura de dossel). Anualmente, durante dez anos, medimos a altura e diâmetro das plantas, e registramos mortalidade e rebrotação. A performance de B. excelsa variou significativamente entre os habitats, tendo a taxa de crescimento mais alta sido observada no roçado. A sobrevivência foi mais alta no roçado (85%) e na capoeira (63%) e mais baixa no castanhal (17%). A capacidade de rebrotação das plantas de castanheira foi maior no roçado, onde as plantas de castanheira se recuperaram após episódios de fogo, a maioria com rebrotação de mais de um caule. Algumas plantas do roçado começaram a produzir flores e frutos aos 9-10 anos do plantio. Nós mostramos que plantas jovens de B. excelsa são heliófilas (com alta demanda de luz), com maior crescimento e sobrevivência em condições de alta luminosidade. Sugerimos a utilização da castanheira em programas de reflorestamento, restauração de áreas degradadas e enriquecimento de floresta secundária, sempre que se adotem medidas adequadas de manejo (e.g., manutenção das condições de exposição direta à luz solar e controle de espécies pioneiras competidoras).
       
  • First record of Anastrepha obliqua (Diptera: Tephritidae) and a tritrophic
           relation with parasitoids in a citrus orchard in Pará state, Brazil

    • Abstract: ABSTRACT Citriculture is a growing industry in Pará state, Brazil, but information regarding fruit flies and their associated parasitoids in this region is lacking. To address this gap in knowledge, we collected oranges (Citrus sinensis), lime oranges (C. sinensis), common sweet limes (C. limettioides), citrons (C. medica) and mandarins (C. reticulata). We recorded field infestation by Anastrepha obliqua in C. sinensis under natural conditions for the first time in the study region, and a tritrophic relationship between C. sinensis, A. obliqua, and the parasitoids Opius bellus and Asobara anastrephae was identified.RESUMO A citricultura está crescendo no Estado do Pará, Brasil, mas faltam informações sobre as pragas conhecidas como moscas-das-frutas e os parasitoides associados na região. Visando abordar esta lacuna no conhecimento, foram coletados frutos de laranja (Citrus sinensis), laranja var. lima (C. sinensis), lima-da-pérsia (C. limettioides), limão-cidra (C. medica) e tangerina (C. reticulata). Registramos, pela primeira vez, infestação em condições naturais de campo por Anastrepha obliqua em C. sinensis no Pará e identificamos uma tritrófica entre C. sinensis, A. obliqua e os parasitoides Opius bellus e Asobara anastrephae.
       
  • Aspects of the reproductive ecology of Trachycephalus cunauaru (Anura:
           Hylidae) in the southern Amazon

    • Abstract: ABSTRACT Trachycephalus cunauaru is an Amazonian hylid that uses phytotelmata to reproduce. There is relatively little information about the species, mainly due to the difficulty of accessing their reproductive sites. In this study, we gathered data on the ecology and natural history of T. cunauaru in the southern Amazon, in the state of Mato Grosso, Brazil. In addition to natural phytotelmata, we used buckets installed at a height of 10 m as artificial phytotelmata. We compared physical and chemical characteristics, as well as the presence of tadpoles between natural and artificial phytotelmata. We also collected data on the reproductive behavior of the species through the use of camera traps. We recorded a density of 14.1 reproductive sites per km². Environmental parameters differed significantly between artificial and natural phytotelmata. In artificial sites, the presence of tadpoles was directly related to trees with a larger diameter. We registered oophagy for the first time for the species and observed that males can use more than one phytotelm. We also recorded the presence of snakes within the reproductive sites. We determined that artificial sites and digital camera traps are a satisfactory alternative for behavioral observations of T. cunauaru and possibly for other species with a similar habit.RESUMO Trachycephalus cunauaru é um hilídeo amazônico que utiliza fitotelmatas para se reproduzir. Existem relativamente poucas informações sobre a espécie, principalmente devido à dificuldade de acesso aos seus sítios reprodutivos. Nesse trabalho, reunimos dados de ecologia e história natural de T. cunauaru em uma área da Amazônia meridional, no estado de Mato Grosso, Brasil. Além de fitotelmatas naturais, utilizamos baldes instalados a uma altura de 10 m como fitotelmatas artificiais. Comparamos características físicas e químicas, bem como a presença e ausência de girinos, entre fitotelmatas naturais e artificiais. Também coletamos dados sobre o comportamento reprodutivo da espécie por meio de armadilhas fotográficas. Registramos uma densidade de 14,1 sítios reprodutivos por km2. Os parâmetros ambientais diferiram significativamente entre fitotelmatas artificiais e naturais. Em sítios artificiais a presença de girinos esteve diretamente relacionada à árvores com maior diâmetro. Registramos, pela primeira vez, oofagia para a espécie e observamos que machos podem utilizar mais de um fitotelmata. Também registramos a presença de cobras nos sítios reprodutivos. Constatamos que sítios artificiais e armadilhas fotográficas representam uma alternativa satisfatória para registros comportamentais para T. cunauaru e, possivelmente, para outras espécies com hábitos similares.
       
  • Birds associated with treefall gaps in a lowland forest in southwestern
           Brazilian Amazonia

    • Abstract: ABSTRACT Natural communities are dynamic systems in time and space. The spatial distribution of plants and animals tends to coincide with the availability of resources needed for the survival and reproduction of each species. Natural treefall gaps offer a number of resources that influence the distribution of birds within the forest. We compared the understory bird assemblages of natural treefall gaps (15 sampling points) with those found in the adjacent forest (15 points) in the Humaitá Forest Reserve in southwestern Brazilian Amazonia. We used mist-nets to sample birds and obtained 700 captures of 105 species. Species richness, number of individuals, and species composition were all similar between gaps and forest, although six species presented some degree of association with the gaps, and nine with the forest. Nectarivores preferred gaps significantly over forest, whereas insectivores and frugivores were distributed equally between gaps and forest. Vegetation height and density differed between gaps and forest, and influenced the distribution of bird species in the two environments. Fruit availability was positively correlated with frugivore abundance in gaps. Overall, 33.3% of the birds associated with the treefall gaps are from lower forest canopy, while the others are understory species. We showed that the use of natural gaps by birds in a fragmented landscape of the Amazon forest contributes to the environmental heterogeneity and succession dynamics following natural events of habitat disturbance.RESUMO As comunidades naturais são sistemas dinâmicos no tempo e no espaço. A distribuição espacial de plantas e animais coincide com a disponibilidade dos recursos necessários para a sobrevivência e reprodução de cada espécie. Clareiras naturais oferecem vários recursos que influenciam a distribuição de aves na floresta. Comparamos a assembleia de aves de sub-bosque de clareiras naturais (15 clareiras) com a encontrada na floresta adjacente (15 pontos) na Reserva Florestal Humaitá, no sudoeste da Amazônia brasileira. Amostramos aves com redes de neblina e contabilizamos 700 capturas de 105 espécies. A riqueza de espécies, o número de indivíduos e a composição de espécies foram semelhantes entre clareiras e floresta, mas seis espécies foram mais associadas com as clareiras e nove com a floresta. Os nectarívoros preferiram significativamente clareiras à floresta, enquanto os insetívoros e frugívoros se distribuíram igualmente entre clareiras e floresta. A altura e a densidade da vegetação variaram significativamente entre clareiras e floresta e influenciaram a distribuição das espécies nos dois ambientes. A disponibilidade de frutos foi correlacionada positivamente com a abundância de frugívoros nas clareiras. Em geral, 33,3% das aves associadas às clareiras são espécies de sub-dossel e as demais de sub-bosque. Mostramos que o uso de clareiras pelas aves em uma paisagem fragmentada da Amazônia contribui para a heterogeneidade ambiental e a dinâmica de sucessão após eventos naturais de perturbação do habitat.
       
  • Phyllanthus chacoensis (Phyllanthaceae): new record for the Brazilian
           Amazon and its lectotypification

    • Abstract: ABSTRACT The first record of Phyllanthus chacoensis for the Brazilian Amazon is presented, based on a specimen from Rondônia state. The species can be recognized by its cauliflorous inflorescence, staminate and pistillate flowers with 4 sepals, devoid of a floral disk, 4 stamens, 2-carpellary ovary, drupaceous, ellipsoidal fruits, with one seed per locule. The species was previously known only from the central-western and northeastern regions of the Caatinga and Pantanal domains in Brazil. We provide a list of synonyms, a detailed description, an updated geographic distribution map in Brazil, data on habitat and conservation status, illustrations of its reproductive characters, and detailed photographs. We also propose a lectotype for the species.RESUMO Apresentamos o primeiro registro de Phyllanthus chacoensis para a Amazônia brasileira, baseado em um espécime encontrado em Rondônia. A espécie pode ser reconhecida pela inflorescência cauliflora, flores de ambos os sexos com 4 sépalas, desprovidas de disco floral, 4 estames, ovário 2-carpelar e frutos elipsoides, drupáceos, com uma semente por lóculo. No Brasil, a espécie era referida, até o momento, apenas para as regiões Centro-Oeste e Nordeste nos domínios Caatinga e Pantanal. Apresentamos a lista de sinônimos, descrição morfológica detalhada, um mapa atualizado da distribuição geográfica no Brasil, dados sobre habitat e status de conservação, assim como fotos em campo e ilustração dos caracteres reprodutivos. Adicionalmente, propomos um lectótipo para o nome.
       
  • Scorpions (Arachnida, Scorpiones) from the state of Acre, southwestern
           Brazilian Amazon

    • Abstract: ABSTRACT Although Brazil has one of the highest scorpion diversities worldwide, the scorpion fauna of the Amazon region remains relatively poorly described. In this study, we updated the list of scorpion species from the state of Acre, in the southwestern Brazilian Amazon, based on a revision of records contained in Brazilian arachnid collections and a survey of the relevant literature. We recorded the occurrence of seven scorpion species belonging to two families (Buthidae and Chactidae) among which we report three new records (Ananteris sp., Tityus (Tityus) gasci, and Chactopsis cf. insignis) for Acre. The results presented herein make an important contribution to the knowledge on scorpion diversity in the Amazonian forests of Acre.RESUMEN Aunque Brasil tiene una de las diversidades de escorpiones más altas del mundo, la fauna de escorpiones de la región amazónica sigue siendo relativamente poco descrita. En este estudio, actualizamos la lista de especies de escorpiones para el estado de Acre, en el suroeste de la Amazonía brasileña, en base a una revisión de los registros contenidos en colecciones de arácnidos brasileños y un estudio de la literatura relevante. Registramos la ocurrencia de siete especies de escorpiones pertenecientes a dos familias (Buthidae y Chactidae), entre las cuales informamos tres nuevos registros (Ananteris sp., Tityus (Tityus) gasci y Chactopsis cf. insignis) para Acre. Los resultados presentados aquí hacen una contribución importante al conocimiento acerca de la diversidad de escorpiones en los bosques amazónicos de Acre.
       
  • First description of the worker of Planicapritermes longilabrum with notes
           on the nest of Planicapritermes planiceps (Blattaria: Isoptera:
           Termitidae)

    • Abstract: ABSTRACT Planicapritermes Emerson, 1949 is a South American termite genus with two nominal species: Planicapritermes planiceps (Emerson, 1925) and Planicapritermes longilabrum Constantino, 1998. The soldiers of this genus are characterized by strongly asymmetrical mandibles. Planicapritermes planiceps was described from soldiers and workers, and P. longilabrum only from soldiers. Here we describe and illustrate workers of P. longilabrum based on specimens collected in Rondônia state, Brazil. We also present a comparison between workers and soldiers of P. planiceps and P. longilabrum, and describe the nest of P. planiceps.RESUMO Planicapritermes Emerson, 1949 é um gênero de cupins da América do Sul com duas espécies nominais: Planicapritermes planiceps (Emerson, 1925) e Planicapritermes longilabrum Constantino, 1998. Os soldados deste gênero são caracterizados por ter mandíbulas fortemente assimétricas. Planicapritermes planiceps foi descrita com base em soldados e operários, e P. longilabrum somente em soldados. Aqui nós descrevemos e ilustramos os operários de P. longilabrum com base em espécimes coletados em Rondônia, Brasil. Também comparamos operários e soldados de P. planiceps e P. longilabrum, e descrevemos o ninho de P. planiceps.
       
  • Immature life cycle of laboratory-reared Phylloicus elektoros and
           Phylloicus amazonas (Trichoptera: Calamoceratidae) from a central
           Amazonian stream

    • Abstract: ABSTRACT We reared field-collected egg masses of the caddisflies Phylloicus amazonas (n = 2) and Phylloicus elektoros (n = 7) to adulthood. First instar larvae of both species hatched up to five days after field collection. Median development time from first larval instar to adult was 229 days for P. amazonas and 275 for P. elektoros, including the pupal development time (median of 13.5 and 16 days, respectively). Shredder organisms have been used frequently in studies related to organic matter processing in freshwater ecosystems. The biological information reported in here may be useful for the design of experimental studies in the field or under laboratory conditions.RESUMO Nós criamos massas de ovos dos tricópteros Phylloicus amazonas (n = 2) e Phylloicus elektoros (n = 7) coletadas no campo até a fase adulta. A mediana do tempo de desenvolvimento do primeiro instar larval ao adulto foi de 229 dias para P. amazonas e 275 dias para P. elektoros, incluindo o tempo de desenvolvimento pupal (mediana de 13.5 e 16 dias, respectivamente). Fragmentadores têm sido frequentemente usados em estudos relacionados ao processamento de matéria orgânica em ecossistemas aquáticos. As informações biológicas fornecidas neste estudo podem ser úteis para o planejamento de estudos experimentais em campo ou em condições de laboratório.
       
  • Ecological risk assessment of Piper aduncum essential oil in
           non-target organisms

    • Abstract: ABSTRACT One possible alternative to chemotherapeutic agents in the treatment and prevention of diseases in fish farms is the use of Piper aduncum essential oil. However, ecotoxicological data are required to ensure its proper use and to prevent adverse effects on non-target organisms. These data are relevant since this essential oil is described as having insecticidal, molluscicidal and cytotoxic activitiy that may be associated with its chemical composition. Thus, the aim of this study was to evaluate the ecotoxicity of P. aduncum essential oil to five test organisms using the species sensitivity distribution (SSD) statistical approach. The chemical composition of the essential oil was characterized by means of gas chromatography coupled to mass spectrometry (GC-MS) and gas chromatography-flame ionization detection (GC-FID) for identification and quantitation purposes, respectively. The main component (75.5%) of the essential oil was dillapiole. The hazardous concentration for 5% of biological species (HC5) was calculated to determine the 95% protection level, resulting in a value of 0.47 mg L-1 (with a confidence interval of 0.028 - 1.19 mg L-1. ). A concentration range related to the level of protection for aquatic communities (the predicted no-effect concentration, PNEC) was determined through the application of safety factors to the HC5 value. The ecotoxicity parameters showed that P. aduncum essential oil can be used safely in water bodies at a concentration equal to or below 0.09 mg L-1.RESUMO Uma possível alternativa ao uso de fármacos veterinários no tratamento e prevenção de doenças na piscicultura é o uso do óleo essencial de Piper aduncum. No entanto, são necessários dados ecotoxicológicos para garantir seu uso apropriado sem causar efeitos adversos a organismos não alvo. Esta informação é relevante, pois esse óleo essencial é descrito como tendo atividades inseticidas, moluscicidas e citotóxicas, possivelmente associadas à sua composição química. Assim, o objetivo deste estudo foi avaliar a ecotoxicidade do óleo essencial de P. aduncum para cinco organismos-teste, usando o método estatístico da Distribuição da Sensibilidade das Espécies (SSD). A composição química do óleo essencial foi caracterizada por cromatografia gasosa acoplada a espectrometria de massa (GC-MS) e cromatografia gasosa com detector de ionização de chama (GC-FID), para fins de identificação e quantificação, respectivamente. O principal componente (75,5%) do óleo essencial foi o dilapiol. A concentração perigosa para 5% de espécies biológicas (HC5) foi calculada com um nível de proteção de 95%, resultando em um valor de 0,47 mg L-1 (com intervalo de confiança de 50% = 0,028 - 1,19 mg L-1). A faixa de concentração relacionada aos níveis de proteção para comunidades aquáticas (concentração sem efeito previsto - PNEC) foi calculada através da aplicação de fatores de segurança ao valor de HC5. Os parâmetros de ecotoxicidade indicaram que o óleo essencial de P. aduncum pode ser usado com segurança em corpos d’água se a concentração for igual ou inferior a 0,09 mg L-1.
       
  • Protocol optimization for the detection of Trypanosoma cruzi DNA in açai
           (Euterpe oleraceae) pulp

    • Abstract: ABSTRACT Chagas disease, caused by the protozoan Trypanosoma cruzi, has often been linked to oral transmission through açai consumption. Molecular methods that allow fast and accurate identification of the pathogen are important for the detection of the presence of the parasite in this food. This study aimed to optimize polymerase chain reaction (PCR)-based detection of T. cruzi DNA in açai pulp. Several dilutions of T. cruzi DTU TcI trypomastigote forms were cultured in liver infusion tryptose (LIT) medium. Trypanosoma cruzi DNA was extracted from the cells and subjected to PCR. Subsequently, culture dilutions were added to açai pulp to evaluate the detection threshold of the optimized PCR assay. We demonstrate that our assay can detect T. cruzi DNA in açai pulp at a concentration of 1.08 × 10-10 ng µL-1. We conclude that our optimized protocol is effective and can be used as an important tool for the detection of T. cruzi contamination in açaí.RESUMO A doença de Chagas, enfermidade causada pelo protozoário Trypanosoma cruzi, tem sido relacionada com frequência à transmissão oral pelo consumo de açaí. Métodos moleculares que fornecem uma identificação rápida e precisa do patógeno para a detecção da presença do parasita são de extrema importância para a detecção da presença do parasita neste alimento. Este estudo teve como objetivo otimizar a detecção de DNA de T. cruzi em polpa de açaí por meio da reação em cadeia da polimerase (PCR). Foram preparadas várias diluições das formas tripomastigotas de T. cruzi DTU TcI cultivadas em meio de cultivo Liver Infusion Tryptose. O DNA de T. cruzi foi extraído das células e submetido à PCR. Posteriormente, as diluições da cultura foram adicionadas às polpas de açaí para avaliar o limite de detecção do novo ensaio de PCR otimizado. Mostramos que nosso ensaio pode detectar DNA de T. cruzi em polpas de açaí na concentração de 1.08 × 10-10 ng µL-1. Concluímos que a metodologia desenvolvida se mostra eficaz e pode ser uma ferramenta importante para a detecção de contaminação por T. cruzi em açaí.
       
 
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