Feeding behavior of Triatoma vitticeps (Reduviidae: Triatominae) in the state of Minas Gerais, Brazil

Memórias do Instituto Oswaldo Cruz

Rita De Cássia Moreira De Souza²  Adriana C Soares¹  Ceres Luciana Alves¹  Elias Seixas Lorosa¹  Marcos Horácio Pereira¹  Liléia Diotaiuti² 

[1] ,Fiocruz Instituto René Rachou Laboratório de Triatomíneos e Epidemiologia da Doença de ChagasBelo Horizonte MG ,Brasil

关键词: hemiptera;    feeding behavior;    saliva;    cibarial pump;    hematophagic;   

DOI  :  10.1590/S0074-02762011000100003

来源: SciELO

【 摘 要 】

The objective of this study was to evaluate the feeding behavior of Triatoma vitticeps through the identification of its food sources and the characterization of the blood ingestion process. In addition, we aimed to verify if the saliva of this vector interferes with the perception of the host during the feedings by creating a nervous impulse. Here, we demonstrated that the T. vitticeps saliva reduces, gradually and irreversibly, the amplitude of the compound action potential of the nervous fibre, which helps decrease the perception of the insect by the host. The precipitin reaction demonstrated the feeding eclecticism of this vector, with the identification of eight food sources - most of them found simultaneously in the same insect. The analysis of the electrical signals produced by the cibarial pump during meals demonstrated that the best feeding performance of T. vitticeps nymphs that fed on pigeons is mainly due to the higher contraction frequency of the pump. The longer contact period with the host to obtain a complete meal compared with other triatominae species of the same instar could favor the occurrence of multiple blood sources in T. vitticeps under natural conditions, as it was evidenced by the precipitin test.

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