Insetos associados ao ataque de hematófagos em cavalos e gado no Nordeste do Pará.

Abstract

In the Amazon, the animals most used in cattle raising in the Amazon are cattle (cattle and bubalines) and horses (equines), which are frequently attacked by hematophagous insects, especially the Tabanidae (horseflies), Ceratopogonidae (maroons), Culicidae (carapanans), Muscidae of the genus Stomoxys sp. (stable fly) and Hematobia irritans (horn fly), among others. Other insect groups deserve attention in these trophic relationships, especially muscid diptera that seek substances that leak from the bite lesions of hematophages. The objective of this study is to survey the hematophagous insects and other associated muscovid diptera that visit horses and cattle in search of blood and other substances that come from their bites, in the municipality of Belém and its surroundings. So far, four observation and collection campaigns have been carried out using a horse as bait. The collection data were processed by time of day (7 am - 6 pm) to define the fluctuation of the diurnal activity of the species. Measurements of climatic factors at the site were taken, also by hours, such as air temperature, relative humidity, brightness, and rainfall. The results of two full days of collecting in January and March 2005 show that a total of 356 specimens of 8 tabanid species were collected. The tabanid species and their respective percentages of the total number of hematophages collected from horses were: Tabanus triviffatus (43.82%), Oichelacera bifascies (31.18%), T. ocidentalis varo dorssoviftatus (17.98%), T. glaucus (2.8%), T. olivaceiventris (1.68%), Leucotabanus exaestuans (1.12%), T.sorbil/ans (0.56%) and Oichelacera damicornis (0.28%). Another 415 specimens of 15 dipteran morphotypes were collected from the horse in association with the bite lesions. The data are plotted by time of day. Some Culicidae and Hymenoptera were also collected in lower abundance.