Efeitos contrastantes da qualidade e diversidade do detrito na oviposição de mosquitos em microcosmos aquáticos
Factors such as litter quality, represented by the stoichiometric proportion between carbon (C) and multiple nutrients that compose the plant litter, and litter diversity, represented by the litter mixture of different taxonomic and/or functional origins, have been pointed out as important variables...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/50619 |
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| Resumo: | Factors such as litter quality, represented by the stoichiometric proportion between carbon (C) and multiple nutrients that compose the plant litter, and litter diversity, represented by the litter mixture of different taxonomic and/or functional origins, have been pointed out as important variables in determining the magnitude of the decomposition process and matter recycling. In aquatic ecosystems, factors that accelerate the decomposition rate of litter may therefore influence the secondary productivity of the planktonic microbiota, which act as a link between the litter and higher trophic levels such as aquatic insect larvae. Therefore, this study aimed to analyze whether the leaf litter quality and diversity influence the choice of location for the oviposition of dipterans. We hypothesized that both the litter quality and diversity would stimulate a greater magnitude of oviposition because both factors positively affect the availability of resources used by mosquito larvae. For this purpose, microcosms containing 200mL of litter infusion were placed at a concentration of 10g/L in monoculture treatments and respective mixtures of leaf litter from four plant species of distinct quality, in addition to a control treatment containing only mineral water. The experiment occurred over 5-7 days, in two experimental blocks. Our results showed a positive effect of leaf litter quality on mosquito oviposition rate, both to a metric based on the decomposition of plant species, and a strong effect of the C:P ratio on oviposition. On the other hand, contrary to what we expected, we observed a negative effect of litter diversity on the magnitude of egg-laying by mosquitoes. We believe that this may have occurred due to a greater probability, in the most diverse habitat, of including a species with characteristics that inhibit decomposition and negatively affect mosquito oviposition. Or else, due to a dilution effect of nutrients, mainly of refractory compounds, reducing the effect of more palatable species for decomposition and oviposition in the most diverse habitats. Our results highlight the importance of litter quality and diversity for insect reproductive behavior. Our data show that locally preserving native plant species, monitoring, and controlling exotic species (which may have high chemical litter quality), and maintaining vegetation diversity can reduce mosquito reproduction. Urban afforestation strategies that prioritize native species and maintain plant diversity can help control diseases transmitted by insect vectors, especially in arboviral endemic areas. |
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