Angela Celis de Almeida Lopes

Thrips species (Insecta: Thysanoptera) associated to Cowpea in Piauí, Brazil

Tripes ainda sao pouco conhecidos em caupi, Vigna unguiculata (L.) Walp., no Piaui, a despeito de sua importância economica na cultura, que se destaca como um dos principais cultivos das regioes Norte e Nordeste do Brasil. Assim, esse estudo objetivou identificar as especies de tripes associadas a cultura em Teresina e Bom Jesus, Piaui, Brasil. De outubro de 2007 a agosto de 2008, inflorescencias de caupi foram amostradas no dois municipios, por meio tecnica do ensacamento simples. Apos triagens, os tripes foram preservados em AGA, montados em lâminas de microscopia permanentes e identificados. As especies identificadas foram: Frankliniella brevicaulis Hood, 1937, F. insularis (Franklin, 1908), F. schultzei (Trybom, 1910), F. tritici (Fitch, 1855) e Haplothrips gowdeyi (Franklin, 1908). As lâminas estao depositadas na colecao entomologica do Departamento de Biologia, Universidade Federal do Piaui. Uma chave de identificacao para as especies e fornecida.

Caracterização e Divergência Genética de Populações de Casearia grandiflora no Cerrado Piauiense

Casearia grandiflora (Salicaceae) is a species typical of the savanna of Piaui state. Knowledge about its genetic diversity is of great importance to establish practices and strategies of biological conservation. This study aimed to characterize C.grandiflora diversity in two areas of savanna. Fifteen quantitative descriptors were analyzed trough measurement of steam, leaf, fruit and seed, followed by multivariate analysis (principal component and grouping). Both principal component analysis and grouping methods showed similarities in plant association, which contribute to the knowledge on patterns of phenotypic variation and species divergence, with the greatest genetic diversity variation found within the populations. The results provide important information because descriptions of morphologic characterization and genetic diversity of this species are still limited in the specific literature.

T-RFLP analysis of soil bacterial structure from Cerrado within the Sete Cidades National Park, Brazil

The aim of this study was to compare the structure of soil bacterial communities across a gradient of three different types of Cerrado within Sete Cidades National Park, northeast Brazil. We evaluated the preserved Cerrado sites across a gradient ranging from ‘campo graminoide’ (CG; open grassland), ‘Cerrado strictu sensu’ (CSS; savannah), and ‘Cerradao’ (CD; closed formation). Bacterial diversity, as estimated by T-RF richness and alpha and beta diversity showed different patterns across the gradient of the Cerrado. For the restriction enzyme Hha I and Msp I, the highest T-RF richness and beta diversity were found at CSS. The distribution and abundance of various fragments sizes varied between different sites. The non-metric multidimensional scaling analysis obtained with the restriction enzyme Hha I separated the sites according to bacterial community; whereas the analysis based on the restriction enzyme Msp I did not clearly separate the evaluated sites. The results show that bacterial structure does not follow the same pattern as found in the others regions with Cerrado vegetation.The aim of this study was to compare the structure of soil bacterial communities across a gradient of three different types of Cerrado within Sete Cidades National Park, northeast Brazil. We evaluated the preserved Cerrado sites across a gradient ranging from ‘campo graminoide’ (CG; open grassland), ‘Cerrado strictu sensu’ (CSS; savannah), and ‘Cerradao’ (CD; closed formation). Bacterial diversity, as estimated by T-RF richness and alpha and beta diversity showed different patterns across the gradient of the Cerrado. For the restriction enzyme Hha I and Msp I, the highest T-RF richness and beta diversity were found at CSS. The distribution and abundance of various fragments sizes varied between different sites. The non-metric multidimensional scaling analysis obtained with the restriction enzyme Hha I separated the sites according to bacterial community; whereas the analysis based on the restriction enzyme Msp I did not clearly separate the evaluated sites. The results show that bacterial structure does n...