ResumoEstudos sobre os impactos da atividade agrícola são importantes para a conservação da entomofauna. Pouco se conhece sobre esses impactos no estado de Sergipe. O objetivo deste trabalho foi realizar um levantamento dos insetos visitantes em cultivos orgânicos e convencionais de tomateiro, identificando os agentes polinizadores e verificando possíveis diferenças existentes entre estas formas de cultivo. As espécies coletadas foram identificadas e classificadas. Foram encontradas seis ordens, com destaque para a Hymenoptera, ordem dos polinizadores das flores de tomate. O número de indivíduos foi 76% maior nas propriedades orgânicas, o que demonstra que os produtos utilizados nas culturas convencionais provavelmente afetam a diversidade da entomofauna.Palavras-chave: polinizadores, buzz pollination, agroecossistemas. AbstractStudies on the impacts of agricultural activities are important for the conservation of insect. Little is known about these impacts in the state of Sergipe. The objective was to survey the insect visitors in organic and conventional tomato crops pollinators identifying and verifying possible differences between these forms of cultivation. The species collected were identified and classified. We found six orders, with emphasis on Hymenoptera, the order of pollinating the flowers of tomato. The number of individuals was 76% higher in organic fields, which shows that the products used in conventional crops are likely to affect the diversity of insect.
Recent studies have investigated the composition of compounds that cover the cuticle in social insects, but few studies have focused on solitary bees. Cuticular hydrocarbons may provide a tool for chemotaxonomy, and perhaps they can be used as a complement to morphology and genetic characters in phylogenetic studies. Orchid bees (Tribe Euglossini) are a highly diverse group of Neotropical bees with more than 200 species. Here, the cuticular hydrocarbons of 17 species were identified and statistical analysis revealed 108 compounds, which allowed for the taxonomic classification according to the genera. The most significant compounds discriminating the four genera were (Z)-9-pentacosene, (Z,Z)-pentatriacontene-3, (Z)-9-tricosene, and (Z)-9-heptacosene. The analyses demonstrated the potential use of CHCs to identify different species.
Cuticular chemical profiles of Euglossa cordata L. males were analyzed to test whether ecological predictors affect their composition and relative proportion. Males were collected in areas of Caatinga and Atlantic Forest from Brazil during two distinct seasonal periods. We found 48 compounds from the cuticular extracts of males, which consisted of hydrocarbons (71.39%), acetates (16.79%), esters (10.5%), alcohols and others (1.31%). We verified that when specimens were separated between biomes, they did not show a qualitative differentiation, but a small quantitative variation of compounds was found between some alkanes. We suggest that these results reflect stability of epicuticular compounds even under variable environmental conditions.
As metodologias utilizadas no processo ensino-aprendizagem devem ser constantemente revisadas. Ensinar Ciênciasrequer trabalhar com termos não utilizados no cotidiano e o jogo, oportuniza ao aluno, a assimilação desses termos,permite a vivência de situações de controle e regras, ensinando conceitos de moral e ética. Para facilitar o ensino, umjogo de tabuleiro foi criado e testado como auxiliar no ensino de zoologia. Este foi utilizado em sala de aula,intermediado pela aplicação de questionários que avaliaram sua eficiência. Teve como público alvo alunos de 6 série, deuma escola estadual do município de Aracaju-Se. O jogo produziu bons resultados refletidos na melhoria das notas e namaior assimilação dos conteúdos, evidenciando também que as variáveis gênero e idade influenciaram nos resultados.
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