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Memórias do Instituto Oswaldo Cruz

Print version ISSN 0074-0276
On-line version ISSN 1678-8060

Mem. Inst. Oswaldo Cruz vol.87 no.4 Rio de Janeiro Oct./Dec. 1992 

Temperature effect upon blood consumption in Triatoma infestans

Silvia Catalá1  , Laura Giojalas1  , Liliana Crocco1 

FCEFN, Centro de Investigaciones Entomológicas de Córdoba y Catédra de Biologia Celular, Córdoba, Argentina


Different blood consumption speed was observed in Triatoma infestans - nymphs and adults - exposed to 12 degrees C and 28 degrees C. Exposure to optimal temperature (28 degrees C) allows the insects to consume blood at a rate of 9% per day. Significative relationship between blood amount present in the promesenteron and consumed blood was found at 28 degrees. Consumption of blood was drastically reduced at the lowest temperature. Accordingly, lack of ovaric development, oviposition and mating behaviour was observed in insects kept at 12 degrees C. Relationship between laboratory and field observations are discussed.

Key words: Triatoma infestans; Chagas' disease; food consumption


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