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| Camargo,Roberto da Silva; Lopes,Juliane F. S.; Forti,Luiz Carlos. |
| Energetic cost of digging behavior in workers of the leaf-cutting ant Atta sexdens (Fabricius). During nest excavation, leaf-cutting ant workers undergo reduction in their body reserve, particularly carbohydrates. In order to estimate the energetic cost of digging, groups of 30 workers of the leaf-cutting ant Atta sexdens were sealed in a hermetic chamber for 24, 48 and 72 hours, with and without soil for digging, and had the CO2 concentration measured using respirometric chambers as well as volume of soil excavated (g). As expected, the worker groups that carried out soil excavation expelled more carbon dioxide than the groups that did not excavate. Therefore, a worker with body mass of 9.65 ± 1.50 mg dug in average 0.85 ± 0.27 g of soil for 24 hours,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Attini; Carbon dioxide; Insecta; Formicidae; Nest. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262013000400009 |
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| Camargo,Roberto S.; Lopes,Juliane F. S.; Forti,Luiz C.; Somera,Alexandre F.; Bacci Jr,Mauricio. |
| Energy substrate used by workers of leaf-cutting ants during nest excavation. In this study we aimed to ascertain whether leaf-cutting ant workers lose body reserves (fat or sugars) as a function of nest excavation. For each treatment, we isolated 10 workers of Atta sexdens into two experimental groups, Control (C- without excavation) and Soil (S- with excavation), which were kept for different time intervals (0, 24, 48 or 72 hours), totaling 700 tested workers. We then determined the concentration of soluble carbohydrates and total lipid content in them. The total carbohydrates were determined colorimetrically, based on the reaction between carbohydrates and sulfuric acid-phenol. For determination of lipids, the insects were immersed in organic solvent... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Attini; Formicidae; Insecta; Lipids; Nest. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262013000400008 |
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| Camargo,Roberto da Silva; Lopes,Juliane F. S.; Forti,Luiz Carlos. |
| Os ninhos adultos das formigas cortadeiras (gênero Atta e Acromyrmex) são compostos de milhares de câmaras subterrâneas, as quais abrigam o jardim de fungo, lixo e a população desses insetos. Entretanto, como as câmaras são construídas? Para responder essa questão, nós hipotetizamos que o jardim de fungo atua como um molde para a construção das câmaras. Assim, foram utilizadas 20 colônias de 6 meses de idade, divididas em quatro séries experimentais: padrão (quantidade normal de jardim de fungo); metade de jardim de fungo; dobro de jardim de fungo e sem jardim de fungo (Testemunha). As variáveis estudadas foram: parâmetros morfológicos das estruturas (túneis e câmara formada); fluxo das atividades das operárias; volume de solo escavado. Como se esperava, o... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Formigas cortadeiras; Escavação do ninho; Divisão de trabalho. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013000400001 |
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