Navegando por Assunto "Formigas"

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Acesso aberto (Open Access)
Extinção espacial em crianças de diferentes idades
(Universidade Federal do Pará, 2021-07-06) REIS, Maiana Araújo dos; TONNEAU, François Jacques; http://lattes.cnpq.br/2917023797307669
Experimental evidence suggests that insects, and in particular ants, rely on spatial cues to travel along large distances when searching for food. In a study that served as a model for the present research, Wehner e Srivinasan (1981) showed that when placed in an unknown context, desert ants (Cataglyphis Formicidae, Hymenoptera) did not travel in a random fashion. In fact, these insects spend most of their time in places where the likelihood of finding food or the nest is more likely: ants searching for food show a pattern of exploration with recurrent oscillations toward the goal. In the present research with children from 6 to 12 years of age, our purpose was to measure behavioral patternsin a situation of spatial extinction and evaluate their degree of similarity to those of the ants in Wehner and Srivinasan’s study. Our procedure involved the children’s respondingwith a computer mouse toward a stimulus displayed on the screen. First, during seven observation trials, the children were supposed to click on a specific location to make a coin appear at this location. Then a 3-min test phase (i.e., extinction) started. During this phase the coin did not appear anymore and the children’s mouse clicks had no programmed consequences. The results obtained during extinction suggest that younger children (from 6 to 7 years of age) respond in a way more similar to the behavior of Wehner and Srivinasam’s ants, whereas older children (from 10 to 12 years of age) follow systematic patterns of exploration that are more in line with the geometric properties of the border of the monitor than with the spatial localization of the target.
Acesso aberto (Open Access)
New evidences supporting trophobiosis between populations of Edessa rufomarginata (Heteroptera: Pentatomidae) and Camponotus (Hymenoptera: Formicidae) ants
(Universidade Federal do Pará, 2016-06) SILVA, Daniel Paiva; FERNANDES, José Antônio Marin
Despite its important effect on the maintenance of tritrophic interactions among plants, insect herbivores, and ants, there is still a paucity of natural history and basic biology information involving trophobiosis among Heteroptera stink bugs. Here, based on previous observations of a new trophobiotic interaction between Edessa rufomarginata (De Geer, 1773) and Camponotus rufipes (Fabricius, 1775) ants, we describe the chemical profile of the honeydew obtained by Gas Chromatography–Mass Spectrometry. There were mainly three different sugars (trehalose, glucose, and sorbose) within our samples. The extrafloral nectaries of Caryocar brasiliense Camb., the host plant of E. rufomarginata, attracts a wide assemblage of Cerrado ants with varying aggressiveness toward herbivores. Therefore, this facultative trophobiotic interaction may allow the survival of the stink bug while feeding on the risky, highly ant-visited plant. Given the rarity of trophobiotic interactions between Pentatomidae species and ants and considering a zoological perspective within this family, here we discuss the ecological and evolutionary routes that may allow the rise of these interactions.