Estudos bionomicos de Cavernicola lenti Barrett & Arias, 1985 (Hemiptera, Reduviidae, Triatominae)

Abstract

In the biological study, the development of the biological cycle of the insect under different feeding conditions was evaluated. The insects were fed on either mouse blood (c) or pigeon blood (p) using two types of rearing techniques (individual or group) at 28 degrees C and 90% relative humidity (which is equivalent to their natural environment). A fifth cycle studied, was fed on mouse blood reared on group, and maintained at laboratory environmental temperature. In the five cycles analyzed, it was found that groups on mouse blood at near natural conditions developed more rapidly (between 60 and 73 days) and had a lower rate of mortality (16.66%). The daily handling and changes in environment, of the individually reared insects, for observation of biological characteristics (no. and duration of bloodmeal, defecation and first fed of each stage) had a negative influence. None of the individuals fed on mouse or pigeon blood reached adult hood. It was found that the longevity and the fertility rate were significantly superior on couples maintained individually on mouse blood. These males had an average lifespan of 110.26 days and the females had an average lifespan of 104.46 days. The average number of eggs laid by each female was 21.26. Four couples kept in groups (five couples in each group) under the same condition, the longevity for males was 51.86 days and for females was 81.06 days. An average of 10.5 eggs were laid by each female. However, the percentage of fertile eggs was higher in couples kept in groups (72.15%) than in the individual couples (57.68%).

A Triatoma maculata (Hemiptera, Reduviidae, Triatominae) population from Roraima, Amazon region, Brazil, has some bionomic characteristics of a potential Chagas disease vector

“…The present study was conducted in order to observe whether this T. maculata population shared other biological traits, than the observed colonization of the human environment, which would point it out as being a potential Chagas disease vector in the area. Among those traits, triatomine feeding frequency and speed of defecation after a blood meal is of great importance for T. cruzi transmission (DIAS, 1956;COSTA & JURBERG, 1990;ALMEIDA et al, 2003). Notwithstanding the fact that triatomine infection was not observed, the triatomine species collected were previously found harboring T. cruzi in natural habitats in the broader Amazon region of neighboring countries, some of which actively involved in Chagas disease transmission.…”

Fauna Triatomínica Do Estado Do Amazonas: Espécies E Distribuição Geográfica

“…Rhodnius paraensis (Sherlock, Guitton & Miles, 1977) (GALVÃO, 2014), Rhodnius pictipes (Stål, 1872) (ALMEIDA & MACHADO, 1971 e Rhodnius robustus (Larrousse, 1927. Essa espécie tem sido encontrada naturalmente infectada por T. cruzi e Trypanosoma rangeli, parasito com potencial de infecção para humanos (COURA et al, 1996;VALLEJO et al, 2015), o qual é pouco nocivo ao hospedeiro vertebrado, mas potencialmente patogênico aos triatomíneos (MARINKELLE, 1968;AÑEZ, 1984).…”