ABSTRACT
Abstract Aedes aegypti prefers densely populated habitats, but has been shown to explore less anthropogenic environments. We investigated composition of the abundance of mosquitoes in forested areas and assessed relationships between species occurrences and different types of land use and land cover at three spatial scales (100m, 500m and 1000m). Mosquitoes were collected from October 2012 to March 2013 using oviposition traps. We collected 4,179 mosquitoes in total including at least 10 species. Aedes albopictus and Limatus durhami were eudominant species, representing 90% of all collected individuals. We found intraspecific differences in response to land use and land cover, and species response patterns were similar at all spatial scales. Ae. albopictus relative abundance was associated with urbanized areas, while Li. durhami, Haemagogus leucocelaenus and Toxorhynchites sp., abundances were associated with native forest. Aedes aegypti were found in five of the eight areas studied, including in an Atlantic forest fragment at a considerable distance from the forest edge (370 m). Aedes aegypti occurrence was not influenced by type of land use or land cover.
Resumo Aedes aegypti tem como habitat preferencial áreas densamente povoadas, mas que tem se mostrado capaz de explorar ambientes menos antropizados. O objetivo desse trabalho foi investigar a abundância de mosquitos em áreas florestadas e avaliar a relação dos diferentes tipos de uso e cobertura do solo, em três escalas de paisagem (buffer de 100m, 500m e 1000m). Os mosquitos foram coletados entre outubro de 2012 a março de 2013 utilizando armadilhas de oviposição. Foram coletados 4,179 culicídeos, de pelo menos 10 espécies, destas, Aedes albopictus e Limatus durhami foram eudominantes, representando 90% do total de indivíduos coletados. As espécies de culicídeos respondem de maneira diversa aos tipos de uso e cobertura do solo, indicando que as afinidades mais evidentes se mantém nas três escalas avaliadas. A abundância relativa de Ae. albopictus se mostrou relacionada às áreas mais urbanizadas, enquanto a de Li. durhami, Haemagogus leucocelaenus e Toxorhynchites sp., à presença da mata nativa. Aedes aegypti esteve presente em cinco das oito áreas estudadas, incluindo um fragmento de Mata Atlântica a uma distância considerável da borda (370m). A ocorrência de Aedes aegypti nas áreas analisadas não demonstrou ser influenciada pelo tipo de uso e cobertura do solo.
Subject(s)
Animals , Female , Urbanization , Environmental Monitoring , Aedes/physiology , ForestsABSTRACT
Aedes aegypti (Diptera, Culicidae) is the predominant mosquito vector of several arboviruses such as dengue fever, yellow fever, chikungunya and zika. The larval stage is the major period of feeding and growth of these insects. Many of the products tested for Ae. aegypti control are ingested by the larvae in their natural environment or under laboratory conditions. In some situations, the identification of tissue lesions caused by the ingestion of such products serves as the primary way to understand their mechanism of action and confirm their effectiveness. Therefore, we aimed to conduct studies on the histological and histochemical characteristics of Ae. aegypti larvae in order to contribute to a better understanding of the pathogenicity caused by chemical or biological products for larval control. Therefore, we characterized tissues in the midgut of healthy Ae. aegypti larvae and present high quality images. These images are intended for comparison with results of morphohistochemical studies testing the effect of control substances in mosquito larvae.