Laboratory estimation of the effects of increasing temperatures on the duration of gonotrophic cycle of Anopheles albimanus (Diptera: Culicidae)

Memórias do Instituto Oswaldo Cruz

Guillermo L Rúa²  Martha L Quiñones²  Iván D Vélez²  Juan S Zuluaga¹  William Rojas¹  Germán Poveda¹  Daniel Ruiz¹ 

[1] ,Universidad de Antioquia Facultad de Medicina Programa de Estudio y Control de Enfermedades TropicalesMedellín,Colombia

关键词: gonotrophic cycle;    Anopheles albimanus;    temperature;    El Niño;    climate;    Colombia;   

DOI  :  10.1590/S0074-02762005000500011

来源: SciELO

【 摘 要 】

The increase of malaria transmission in the Pacific Coast of Colombia during the occurrence of El Niño warm event has been found not to be linked to increases in the density of the vector Anopheles albimanus, but to other temperature-sensitive variables such as longevity, duration of the gonotrophic cycle or the sporogonic period of Plasmodium. The present study estimated the effects of temperature on duration of the gonotrophic cycle and on maturation of the ovaries of An. albimanus. Blood fed adult mosquitoes were exposed to temperatures of 24, 27, and 30°C, held individually in oviposition cages and assessed at 12 h intervals. At 24, 27, and 30°C the mean development time of the oocytes was 91.2 h (95% C.I.: 86.5-96), 66.2 h (61.5-70.8), and 73.1 h (64-82.3), respectively. The mean duration of the gonotrophic cycle for these three temperatures was 88.4 h (81.88-94.9), 75 h (71.4-78.7), and 69.1 h (64.6-73.6) respectively. These findings indicate that both parameters in An. albimanus are reduced when temperatures rose from 24 to 30°C, in a nonlinear manner. According to these results the increase in malaria transmission during El Niño in Colombia could be associated with a shortening of the gonotrophic cycle in malaria vectors, which could enhance the frequency of man-vector contact, affecting the incidence of the disease.

【 授权许可】

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