Análise da Diversidade de Espécies de Mosquitos Vetores (Diptera: Culicidae) em Floresta Prístina (Caxiuanã, Pará)

Abstract

There is extreme variation in the suite of arbovirus vector mosquito species (Diptera: Culicidae) collected at different locations in the Amazon, but most collections are limited to species identification without concern for comparative analysis of taxon richness and relative abundance. This study aimed to evaluate the diversity of mosquitoes of the family Culícídae collected at one point in the dryland dense forest of the ECFPn. Collections were made from the meteorological tower of the Carbo-Pará project, at four different heights: ground, 8 meters 16 meters and 30 meters (canopy) in 5 different periods (July, September and December 2005 and February and April 2006), using human attractants, through entomological nets, suckers and tubes. A total of 25,550 adult specimens of the Culicidae family were captured, belonging to 15 genera and 57 species. The most frequent species were: Culex portesi (83.89%), Haemagogus janthinomys (3.30%), Coquillettidia venezuelensis (3.26%), Culex spissipes (1.96%) and Sabethes chloropterus (1.03%). We also identified 10 species with only one specimen ("singletons") and 5 species with only two specimens ("doubletons"). Similarity studies are being carried out using Jaccard and Sorensen indices, among the four points referring to the forest strata and among the five samples referring to the collection periods. The highest similarity in relation to verticality, according to Jaccard's index is between 8 m and 16 m (0.65) and 16 m and 30 m (0.65), and the lowest is between soil and canopy (0.4). In relation to seasonality the highest similarity occurred between the months of September and February (0.65) and the lowest similarity occurred between December and April (0.39).The Sorensen index showed the highest similarity between heights soils and 16 meters (0.72) and the lowest between 8 and 30 meters (0.28). The highest similarity in relation to the collection periods was between the months of July and April (0.86) and the lowest was between the months of December and April (0.20). The data, still preliminary, will help in studies on the diversity, abundance and species richness of the Culícídae family.