Fitness evaluation of two Brazilian Aedes aegypti field populations with distinct levels of resistance to the organophosphate temephos

被引:43
作者
Belinato, Thiago Affonso [1 ,2 ]
Martins, Ademir Jesus [1 ,2 ]
Valle, Denise [1 ,2 ,3 ]
机构
[1] Fiocruz MS, Inst Oswaldo Cruz, Lab Fisiol & Controle Artropodes Vetores, Rio De Janeiro, RJ, Brazil
[2] Inst Biol Exercito, Entomol Lab, Rio De Janeiro, RJ, Brazil
[3] Univ Fed Rio de Janeiro, Inst Bioquim Med, Inst Nacl Ciencia & Tecnol Entomol Mol, BR-21941 Rio De Janeiro, RJ, Brazil
来源
MEMORIAS DO INSTITUTO OSWALDO CRUZ | 2012年 / 107卷 / 07期
关键词
Aedes aegypti; insecticide resistance; temephos; fitness; RIO-DE-JANEIRO; INSECTICIDE RESISTANCE; PERMETHRIN RESISTANCE; INDIAN STRAIN; DIPTERA; CULICIDAE; VECTOR; MUNICIPALITIES; HISTORY; COSTS;
D O I
10.1590/S0074-02762012000700013
中图分类号
R38 [医学寄生虫学]; Q [生物科学];
学科分类号
07 ; 0710 ; 09 ; 100103 ;
摘要
In Brazil, decades of dengue vector control using organophosphates and pyrethroids have led to dissemination of resistance. Although these insecticides have been employed for decades against Aedes aegypti in the country, knowledge of the impact of temephos resistance on vector viability is limited. We evaluated several fitness parameters in two Brazilian Ae. aegypti populations, both classified as deltamethrin resistant but with distinct resistant ratios (RR) for temephos. The insecticide-susceptible Rockefeller strain was used as an experimental control. The population presenting the higher temephos resistance level, Aparecida de Goiania, state of Goias (RR95 of 19.2), exhibited deficiency in the following four parameters: blood meal acceptance, amount of ingested blood, number of eggs and frequency of inseminated females. Mosquitoes from Boa Vista, state of Roraima, the population with lower temephos resistance level (RR95 of 7.4), presented impairment in only two parameters, blood meal acceptance and frequency of inseminated females. These results indicate that the overall fitness handicap was proportional to temephos resistance levels. However, it is unlikely that these disabilities can be attributed solely to temephos resistance, since both populations are also resistant to deltamethrin and harbour the kdr allele, which indicates resistance to pyrethroids. The effects of reduced fitness in resistant populations are discussed.
引用
收藏
页码:916 / 922
页数:7
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