Publicação
Different behaviours elicited by CO2 in fruit fly larvae
| Resumo: | CO2 molecules are present almost everywhere and have many biological roles, special as environmental cues or metabolic products of animals. Due to its importance, many insect species are able to sense its presence and concentration. In animals this molecule elicits appetitive behaviours, like moths and mosquitoes. On others, like fruit flies of the Drosophila melanogaster species, this molecule strong repulsive behaviours. There are specific CO2 receptors with the role of detecting this gas. However, their localization is different, according to the behaviours it elicits. Receptors in moth and mosquitoes, are present in the maxillary palps, while in fruit flies, receptors are in the antennae. However, it has been reported that CO2 can trigger attractive behaviours in D. melanogaster, but CO2 is being released by a liquid solution. This appetitive behaviour is associated with the presence of several microorganisms that release CO2 as a product of their metabolism. Therefore, these solutions are sensed by flies as appetitive. Although, CO2 is not being sensed by the antennae, like its gas phase. Since, CO2 is released by a liquid, it is being sensed by specific gustatory neurons in the proboscis. Therefore, CO2 can elicit different behaviours in the same insect. A possible reason for this different are the different projections of the sensory system, olfaction and taste. But those projections are hard to study in adults of D. melanogaster, therefore, larvae were used, because they are much simpler. However, larvae show aversive behaviours to CO2 in its gas phase, but the behaviour to carbonated solutions is not known. In this work was seen that larvae can feed on liquids and effectively choose between them, and in the presence of a carbonated solution, they show appetitive behaviours like adults. Therefore, we can characterize the projections of the gustatory and olfactory system to associate different brain regions with different behaviours. |
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| Autores principais: | Martins, Nuno Pimpão Santos, 1987- |
| Assunto: | Fisiologia animal Drosophila melanogaster CO2 Teses de mestrado - 2010 |
| Ano: | 2010 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório da Universidade de Lisboa |
| Resumo: | CO2 molecules are present almost everywhere and have many biological roles, special as environmental cues or metabolic products of animals. Due to its importance, many insect species are able to sense its presence and concentration. In animals this molecule elicits appetitive behaviours, like moths and mosquitoes. On others, like fruit flies of the Drosophila melanogaster species, this molecule strong repulsive behaviours. There are specific CO2 receptors with the role of detecting this gas. However, their localization is different, according to the behaviours it elicits. Receptors in moth and mosquitoes, are present in the maxillary palps, while in fruit flies, receptors are in the antennae. However, it has been reported that CO2 can trigger attractive behaviours in D. melanogaster, but CO2 is being released by a liquid solution. This appetitive behaviour is associated with the presence of several microorganisms that release CO2 as a product of their metabolism. Therefore, these solutions are sensed by flies as appetitive. Although, CO2 is not being sensed by the antennae, like its gas phase. Since, CO2 is released by a liquid, it is being sensed by specific gustatory neurons in the proboscis. Therefore, CO2 can elicit different behaviours in the same insect. A possible reason for this different are the different projections of the sensory system, olfaction and taste. But those projections are hard to study in adults of D. melanogaster, therefore, larvae were used, because they are much simpler. However, larvae show aversive behaviours to CO2 in its gas phase, but the behaviour to carbonated solutions is not known. In this work was seen that larvae can feed on liquids and effectively choose between them, and in the presence of a carbonated solution, they show appetitive behaviours like adults. Therefore, we can characterize the projections of the gustatory and olfactory system to associate different brain regions with different behaviours. |
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