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Temperature preference in Rhodnius prolixus, effects and possible consequences.

P E Schilman1, C R Lazzari

  • 1Laboratorio de Fisiología de Insectos, Dpto. de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina. pschilma@biomail.ucsd.edu

Acta Tropica
|January 24, 2004
PubMed
Summary

Adult Rhodnius prolixus exhibit specific thermal preferences, with temperature influencing weight loss and Chagas

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Area of Science:

  • Entomology
  • Thermoregulation
  • Disease Ecology

Background:

  • Rhodnius prolixus is a significant vector of Chagas' disease.
  • Understanding insect thermopreference is crucial for predicting disease transmission dynamics.
  • Environmental temperature impacts insect physiology, including weight loss and reproductive success.

Purpose of the Study:

  • To investigate the thermal preference of adult Rhodnius prolixus.
  • To determine how sex, starvation, and daily cycles affect thermal preference.
  • To assess the impact of environmental temperature on weight loss and oviposition.

Main Methods:

  • Experiments were conducted using a temperature gradient to assess thermal preference.
  • Insects were subjected to different starvation levels and controlled environmental temperatures.

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  • Weight loss rates and oviposition temperatures were measured.

    • Main Results:

    • Mean preferred temperatures were 25.0°C for males and 25.4°C for females.
    • Thermal preference varied daily and decreased with prolonged starvation.
    • Higher environmental temperatures (32°C vs. 24°C) significantly increased weight loss, impacting nutrient conversion and water balance.

    Conclusions:

    • Rhodnius prolixus exhibits distinct thermal preferences influenced by sex, starvation, and circadian rhythms.
    • Increased weight loss at higher temperatures suggests potential for increased biting rates and Chagas' disease transmission.
    • Oviposition occurs across a range of temperatures, peaking between 25-26°C, with implications for vector distribution.