4,639 research outputs found

    Microhabitat determines uneven distribution of Amblyomma parvum but not of Amblyomma sculptum ticks within forest patches in the Brazilian Pantanal.

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    Environmental distribution of the two most abundant ticks in forest areas in the Brazilian Pantanal was evaluated by CO2 traps methodology in the wet season (peak of adult ticks) of 2012 and 2013. Adults of Amblyomma parvum were concentrated inside agglomerates of Bromelia balansae, in the border of forest patches. Adults of Amblyomma sculptumoccurred in similar numbers both in bromeliad clumps and in bromeliad-free areas. Dif-ferential distribution of ticks in this habitat could be associated to the frequent use of bro-meliad clumps by wild animals (potential hosts) and to the microclimate conditions inside this vegetation in the Pantanal. It is important to verify whether larvae and nymphs of A. parvum have a similar pattern of distribution in the same areas, during the dry season. These stages are more susceptible to desiccation and their principal hosts, non-volant small mammals, also use these bromeliad areas

    Complementary data on four methods for sampling free-living ticks in the Brazilian Pantanal.

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    In this study, four methods for sampling free-living ticks that are used in ecological and human tick-bite risk studies were evaluated. Cloth dragging, carbon dioxide traps and visual searches and inspection of plant litter on the ground were used in field and forest areas within the Brazilian Pantanal. Among the three tick species collected, Amblyomma sculptum predominated, followed by Amblyomma parvum and Amblyomma ovale. Dragging, a cheap and simple technique, yielded the highest numbers of ticks, particularly nymphs. The visual search detected a high number of adult ticks and provided information on tick questing height. Even though laborious, plant litter examination showed that large numbers of ticks may use this stratum. Carbon dioxide (CO2) traps are expensive and difficult to handle, but they are highly efficient for adult ticks, especially A. parvum. These data indicate that one method alone is incapable of providing a representative sample of the tick fauna in a particular area and that multiple techniques should be used for tick population studies

    Parâmetros biológicos de Amblyomma Cajennense (Acari: Ixodidae) originário do Pantanal Sul-Mato-grossense em porco doméstico (Sus scrofa) sob condições experimentais.

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    No Pantanal o carrapato Amblyomma cajennense apresenta altos níveis de infestação ambiental e também em porcos monteiros (Sus scrofa), espécie exótica amplamente distribuída na região. No presente estudo avaliamos o potencial desses hospedeiros para a manutenção do ciclo de vida desse carrapato, utilizando o porco doméstico (Sus scrofa) como modelo experimental. Levando em conta os parâmetros biológicos avaliados o carrapato apresentou bom desempenho em duas infestações consecutivas. Sendo assim, o porco monteiro possui potencial para manutenção do ciclo do carrapato A. cajennense no Pantanal

    Produtividade de grãos verdes do feijão-caupi sob diferentes regimes hídricos.

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    O objetivo deste trabalho foi avaliar a produtividade de grãos verdes, os componentes de produção e a eficiência do uso da água do feijão-caupi, sob regimes hídricos. O experimento foi conduzido na Embrapa Meio-Norte, em Teresina - PI, entre setembro e novembro de 2009

    Propagação vegetativa de pitaia vermelha em resposta a profundidade de plantio e dominância apical.

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    A produção de mudas de qualidade é condição fundamental para o sucesso de uma boa produção agrícola, o que justifica o estudo da propagação por estaquia, para facilitar o estabelecimento em novas áreas cultivadas

    Estaquia de pitaia vermelha com remoção da gema apical submetida a profundidades de plantio diferentes.

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    Assim, este estudo foi conduzido com o objetivo de avaliar os efeitos da profundidade de plantio em estacas de pitaia e da quebra da dominância apical na formação das brotações, e a partir dessas técnicas identificar qual o melhor método de condução da cultura

    Serological, parasitological and molecular assessment of Babesia bovis and Babesia bigemina in cattle from State Maranhão.

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    The aim of the present study was to determine the prevalence of Babesia bovis and Babesia bigemina in dairy cattle from São Luis Island in the state of Maranhão, Brazil. A total of 281 blood samples were collected. In total, 275 (97.9%) animals were B. bovis-reactive and B. bigemina-reactive in the Enzyme-Linked Immunosorbent Assay (ELISA). The microscopy examination detected 22 (7.8%) animals that were positive for Babesia sp. and the Polymerase Chain Reaction (PCR) analysis showed that 91 animals (32.38%) and 23 animals (8.18%) were positive for B. bovis and B. bigemina, respectively, while 17 animals (6.04%) were co-infected. There is a high level of transmission of these protozoa in Maranhão, and the animals were naturally exposed. Therefore, it is possible to characterize the island as enzootic stability for babesiosis, indicat-ing a risk of financial losses when susceptible animals are introduced from areas of enzootic instability or free regions of B. bovis and B. bigemina.Título em português: Avaliação sorológica, parasitológica e molecular de Babesia bovis e Babesia bigemina no gado do Estado do Maranhão
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