Dinâmica da alimentação e dejeção do Triatoma sordida

Abstract

Today, Triatoma sordida is the most frequently captured triatomine in Brazil. For a better understanding of its vectorial potential, its feeding dynamics and dejections behaviour were studied in comparison with Triatoma infestans and P. megistus. The proportion of T. sordida and T. infestans that blood fed on anaesthetized rats did not differ significantly. There was no significant difference in the time elapse between release of the bugs and the initiation of blood feeding. The mean time between completion of a blood meal and the first dejection was significantly lower in T. infestans than in T. sordida. The numbers of insects that defecated during the blood meal or immediately afterwards was similar for both species. Approximately 80 specimens of each of T. sordida, T. infestans and Panstrongylus megistus were offered daily blood meals for 30 minutes, over a period of 30 days. T. sordida bit more frequently than did P. megistus and T. infestans. These data could indicate that T. sordida may not be completely adapted to its host and might have difficulty in complete its blood meal.

Population dynamics and feeding behavior of Triatoma brasiliensis and Triatoma pseudomaculata, main vectors of Chagas disease in Northeastern Brazil

“…Trumper and Gorla (1991) reported that in T. infestans defecation depends on the quantity of blood ingested and on the starvation period. Diotaiuti et al (1995) showed for T. infestans and T. sordida the occurrence of defecation during and/or immediately after feeding in 90% and 86% of the insects, respectively, compared with our observations of 50% in T. brasiliensis and 75% in T. pseudomaculata. Nevertheless, we suspect that the ready disturbance of T. pseudomaculata could influence its likelihood of completing a feed and defecating on its host.…”

Parâmetros populacionais para Triatoma sordida Stal, 1859, o vetor mais freqüente da doença de Chagas no Triângulo Mineiro (Heteroptera, Triatominae)

“…Este padrão não foi observado no presente estudo, porém a curva de sobrevivência observada se aproxima do Tipo II 8 , sendo a taxa de mortalidade relativamente constante, apresentando dois picos, o primeiro no t 0 e o segundo no t 5 e t 6 .…”

Biologia comparativa e comportamento alimentar de Rhodnius neglectus e Rhodnius robustus (Triatominae) sob condições de laboratório

“…Além da suscetibilidade aos parasitos, outras características dos triatomíneos como o comportamento alimentar (detecção da fonte alimentar, número de picadas, tempo de repasto, quantidade de sangue ingerido), e a frequência de dejeções também podem determinar a eficiência na transmissão do T. cruzi [15][16][17][18][19][20][21][22][23][24][25][26][27][28] …”