During the period of April 1983 to September 1984 a fauna survey in bracatinga (Mimosa scabrella Benth.) was conducted in Almirante Tamandaré, PR. Samples were taken at 15 days time intervals is canopies of groves with 8, 42 and 60 months old using a canopy net, and the respective ground vegetation with a sweep net. To obtain the diversity index the formula alfa = (s-1)/log N was used. To tabulate the data, the option was taken for the orders Homoptera, Hemiptera and Coleoptera, since they had greater quali-quantit’ative consistency. According to the data it became evident that as tree age increases there is a simultaneous increase in species diversity. In regard to the two ecosystems studied the ground vegetation showed a greater diversity index as well an in regard to species diversity among families. Chrysomelidae present the higher index in the ecosystems formed by canopies and among different ground vegetation, the most evident was the Curculionidae family.
diversity index; insect fauna; Mimosa scabrella