Sazonalidade e atividade diurna de Tabanidae (Diptera: Insecta) de dossel na Reserva Florestal Adolpho Ducke, Manaus, AM / Seasonality and diurnal activity of Tabanidae (Diptera: Insecta) of canopy in the Adolpho Ducke Forested Reserve, Manaus, Amazonas State, Brazil

A sazonalidade e periodicidade diurna de vôo de tabanídeos de dossel na Reserva Ducke, Manaus, AM, foram analisadas utilizando-se uma armadilha suspensa instalada a 20 m de altura, conectada a um cilindro de gás carbônico. Realizaram-se coletas quinzenais, com duração de um dia, no período de abril de 2000 a junho de 2001. O material foi retirado da armadilha em intervalos de 2h e acondicionado em tubos plásticos. Coletaram-se 955 indivíduos, correspondendo a trinta espécies. Philipotabanus stigmaticalis (Krõber) (37,9 por cento) ocorreu ao longo do ano, com maior atividade de vôo entre 12:00h e 16:00h. Acanthocera marginalis Walker (16,3 por cento) ocorreu ao longo do ano, sendo mais abundante nos meses menos chuvosos (julho a novembro), com maior atividade no período entre 10:00h e 12:00h. Acanthocera gorayebi Henriques & Rafael (9,0 por cento) foi mais abundante em julho, com maior atividade entre 10:00h e 12:00h. Dichelacera damicornis (Fabricius) (10,9 por cento) ocorreu nos meses de maior precipitação (janeiro, fevereiro e abril), com maior atividade diurna entre 10:00h e 14:00h. Diachlorus podagricus (Fabricius) (6,6 por cento) ocorreu ao longo de todo o ano exceto em fevereiro, mostrando maior atividade entre 10:00h e 14:00h. Os fatores climáticos, quando correlacionados com a riqueza de tabanídeos, somente mostraram correlação com a precipitação; enquanto a abundância dos espécimes foi correlacionada com a umidade e com a precipitação.

The seasonality and diurnal flight activity of tabanids from canopy was studied at Ducke Reserve, in the county of Manaus, Amazonas State, Brazil, using a suspended trap installed at 20 m above the soil, connected to the carbon dioxide gas cylinder. During one day, twice monthly collects of Tabanidae were taken from April 2000 to June 2001. The material was collected from the trap in intervals of 2h and placed in plastic tubes. A total of 955 individuals, corresponding to thirty species were collected. Philipotabanus stigmaticalis (Krõber) (37.9 percent) was caught all over the year and showed higher flight activity between 12:00 p.m. and 4:00 p.m. Acanthocera marginalis Walker (16.3 percent) was more abundant in the less rainy months (July to November) with a higher activity period between 10:00 a.m. and 12:00 p.m. Acanthocera gorayebi Henriques & Rafael (9.0 percent) was more abundant in July with more activity between 10:00 a.m. and 12:00 p.m. Dichelacera damicornis (Fabricius) (10.9 percent) was more abundant in the months of heavier rainfall (January, February and April) and showed higher diurnal activity between 10:00 a.m. and 2:00 p.m. Diachlorus podagricus (Fabricius) (6.6 percent) was caught throughout the year except in February and showed higher activity between 10:00 a.m. and 14:00 p.m. The climatic factors when correlated to the tabanids richness just showed significant correlation with precipitation, while the specimens abundance was correlated to humidity and precipitation.

Occurence of larval Culicidae (Diptera) in water retained in Aquascypha hydrophora (Fungus: Stereaceae) in Central Amazônia, Brazil

The community structure of insects, especially mosquito larvae, in water held in the fungus Aquascypha hydrophora (Berk.) Reid (Stereaceae) is reported. The study was done in the Adolpho Ducke Forest Reserve, 26 km east of Manaus, AM, Brazil, from September 1998 through November 1999. The most abundant entomofauna were immature Culicidae (n = 121) 91.7 percent, followed by adult Dytiscidae (n = 3) 2.3 percent, immature Chironomidae (n = 5) 3.8 percent and immature Tipulidae (n = 3) 2.3 percent. Culicidae associated with A. hydrophora comprised species of the subfamilies Anophelinae and Culicinae