ABSTRACT
This paper describes population structure, spatial distribution and habitat selection of wild and peridomestic populations of Triatoma rubrovaria (Blanchard, 1843). Field studies were carried out at Las Piedras and La Bolsa in the Northern Department of Artigas, Uruguay. A semicircular sampling area, divided in seven or eight triangular sectors was sequentially examined from October 1990 to November 1991. At Las Piedras (typical wild habitat) 1063 T. rubrovaria bugs were collected from 84% of the rocky outcroops ("pedregales"). Abundance varied by season peaking in October-November (spring). Throughout the year, most of the population was made up of third, fourth and fifth instar nymphs; adults were found from October to March. In the peridomestic environment of La Bolsa, however T. rubrovaria was less common and showed a more irregular instar distribution. Colonized ecotopes, were those close to houses. In both sites T. rubrovaria was mainly associated with the geckonid Homonota uruguayensis and the cockroach Blaptica dubia.
Subject(s)
Triatoma/growth & development , Animals , Female , Male , Population Density , Sampling Studies , Seasons , UruguayABSTRACT
It has been studied the feeding patterns of Triatoma rubrovaria (wild triatominae bug, and intradomiciliary secondary vector of T. cruzi) in a rural area of "La Bolsa" (Department of Artigas). Agar double diffusion test were used for analyze the blood meal, from 120 insects, which were confronted to 13 antisera. It has 251 identify blood meals, and the most frequently was mammalian host (73%), but it has a variable source of feeding (mammals, birds, reptiles and cockroach), including humans rate 8% of the total. The identify of haemolimphe as feed, place this triatominae bug as an intermediary vector between predator and haematophagous. The most usual mammals are dasypodides and bovines. The frequence of human blood meal near the dwellings, shows its potentiality as vectors. Therefore, the peridomicile is an area of interaction between, domestic, wild and sinantropic host. The trypanosomic infection's rate at peridomiciles was lesser those at wild areas.
Subject(s)
Feeding Behavior , Hemiptera/physiology , Animals , Birds , Cats , Cattle , Chagas Disease/transmission , Disease Vectors , Dogs , Humans , Rural Health , UruguayABSTRACT
Triatoma platensis Neiva 1913 (Hemiptera, Triatominae), especie ornitofila, con area de dispercion conocida en Argentina, Bolivia, Paraguay y Uruguay es notificada en um primer registro para Brasil. Hallada en el municipio de Uruguaiana (Rio Grande do Sul) en nidos de Anumbius annumbi (Vieillot, 1817) (Passeriformes, Furnariidae) donde cohabitaba con cricetidos de la especie Orizomys flavescens. Ningun ejemplar de los siete colectados se presento infectado por Trypanosoma cruzi.
Subject(s)
Animals , Male , Female , Triatoma/physiology , Brazil , EcologyABSTRACT
Triatoma platensis, an ornitophilic species, found in Argentina, Bolivia, Paraguay and Uruguay is reported for the first time in Brazil. It was found in the county of Uruguaiana (Rio Grande do Sul) in nests of Anumbius annumbi (Vieillot, 1817) (Passeriformes, Furnariidae) where it cohabited with cricetids belonging to the species Orizomys flavescens. None of the seven individuals collected were infected by Trypanosoma cruzi.