Studies on entomological monitoring: mosquito species frequency in riverine habitats of the Igarapava Dam, Southern Region, Brazil Estudos em monitoramento entomológico: mudanças na freqüência de mosquitos em habitats ripários da usina hidroelétrica de Igarapava, Sudeste do Brasil
Diversity of mosquito species was evaluated in different habitats before and after the Igarapava reservoir flooding in the Grande River, Southern Cerrado of Brazil. We aimed at verifying changes in these mosquito populations in consequence of the lake formation. Four habitats were selected as sampli...
| Published in: | Revista do Instituto de Medicina Tropical de São Paulo |
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| Main Authors: | , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Universidade de São Paulo (USP)
2004
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| Subjects: | |
| Online Access: | https://doi.org/10.1590/S0036-46652004000400009 https://doaj.org/article/da2a516dde9b4b608d5481340ecc2bf7 |
| Summary: | Diversity of mosquito species was evaluated in different habitats before and after the Igarapava reservoir flooding in the Grande River, Southern Cerrado of Brazil. We aimed at verifying changes in these mosquito populations in consequence of the lake formation. Four habitats were selected as sampling stations: peridomiciliary habitat, pasture, "veredas" and gallery forest patch. Bimonthly collections were made with the Shannon trap and human bait, including diurnal, crepuscular and nocturnal period of mosquito activity. The Shannon Index results from the potential vectors were compared using Student t-test. Aedes scapularis, Anopheles darlingi and An. albitarsis senso latu seasonal abundance were described with moving average and compared using chi2 test. There were changes in the mosquito frequency in the habitats, except for the "veredas" that was 13 km away from the catchment area. The altering in mosquito species seasonal abundance suggests breeding places expansion. Diversity indexes can be used to monitor changes in mosquito vector population in environments where abrupt disturbance can alter disease transmission cycles. Avaliou-se a diversidade de mosquitos em diferentes habitats antes e depois da formação do reservatório de Igarapava no Rio Grande, Cerrado do Sudeste do Brasil, com objetivo de verificar alteração nessas populações de mosquitos. Quatro habitats foram selecionados como sítios de coleta: a) peridomicílio rural, b) pastagem, c) veredas e d) mata ciliar. Realizaram-se coletas bimestrais com isca humana e armadilha de Shannon, incluindo períodos de atividade culicídea diurna, crepuscular vespertina e noturna. Os resultados do Índice de Shannon para os potenciais vetores nos diferentes habitats foram comparados pelo teste t de Student. As abundâncias sazonais de Aedes scapularis, Anopheles darlingi e Anopheles albitarsis s.l., foram descritas com a média móvel e comparadas com o teste chi2. Houve alteração nas freqüências dos mosquitos nos habitats, com exceção das veredas, que estavam ... |
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