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The chronobiological basis of the daily dynamics of thermopreference was tested in adults of Triatoma infestans, continuously registering the preferred temperature of insects released over a temperature gradient for 13 days. We found that the thermopreference in T. infestans is a dynamic process that depends on the time of the day and the post-feeding time. When submitted to a 12:12 h light/darkness cycle (L/D), the preferred temperature reached the highest and the lowest values at the end of the light and dark phases, respectively. This daily rhythm persisted under constant conditions of illumination (D/D and L/L), suggesting the existence of an internal oscillator controlling this behaviour. Statistical analysis revealed that the thermopreference of insects kept under L/D exhibited a ca. 24 h periodicity, while insects kept in D/D and L/L showed free-running periods of τ (D/D) = 23.35 and τ(L/L) = 27.35 h, respectively. The persistence of a cyclic pattern of thermopreference under constant conditions, and free-running periods, close to, but different from 24 h, demonstrate the existence of an endogenous control of the thermopreference in this species. The biological relevance of these results is discussed in the light of the hypothesis that both the length of time elapsed since feeding and the time of the day modify thermopreference in these bugs. The gradual decline in preferred temperature following feeding may be associated with energy conservation during starvation. The rhythmic modulation of thermopreference may be associated with the daily rhythm of locomotion activity shown by these bugs. © 2003 Elsevier Ltd. All rights reserved.


Documento: Artículo
Título:Chronobiological basis of thermopreference in the haematophagous bug Triatoma infestans
Autor:Minoli, S.A.; Lazzari, C.R.
Filiación:Lab. de Fisiol. de Insectos, Depto. de Biodiversidad y Biol. Exp., Pabellón II, (C1428EHA) Buenos Aires, Argentina
Palabras clave:Behaviour; Chagas disease; Rhythms; Temperature; Triatominae; behavior; diurnal activity; temperature; Hemiptera; Hexapoda; Reduviidae; Triatoma; Triatoma infestans; Triatominae
Página de inicio:927
Página de fin:932
Título revista:Journal of Insect Physiology
Título revista abreviado:J. Insect Physiol.


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---------- APA ----------
Minoli, S.A. & Lazzari, C.R. (2003) . Chronobiological basis of thermopreference in the haematophagous bug Triatoma infestans. Journal of Insect Physiology, 49(10), 927-932.
---------- CHICAGO ----------
Minoli, S.A., Lazzari, C.R. "Chronobiological basis of thermopreference in the haematophagous bug Triatoma infestans" . Journal of Insect Physiology 49, no. 10 (2003) : 927-932.
---------- MLA ----------
Minoli, S.A., Lazzari, C.R. "Chronobiological basis of thermopreference in the haematophagous bug Triatoma infestans" . Journal of Insect Physiology, vol. 49, no. 10, 2003, pp. 927-932.
---------- VANCOUVER ----------
Minoli, S.A., Lazzari, C.R. Chronobiological basis of thermopreference in the haematophagous bug Triatoma infestans. J. Insect Physiol. 2003;49(10):927-932.