Effects of temephos and temperature onWolbachiaload and life history traits ofAedes albopictus

Medical and Veterinary Entomology - Tập 20 Số 3 - Trang 300-307 - 2006
S. WIWATANARATANABUTR1, Pattamaporn Kittayapong1
1Centre for Vectors and Vector-borne Diseases and Department of Biology, Faculty of Science, Mahidol University, Bangkok, Thailand

Tóm tắt

AbstractMaternally inheritedWolbachia(gram‐negative bacteria) often affect the reproductive fitness of their arthropod hosts and may cause cytoplasmic incompatibility (CI). ComparingWolbachia‐infected and uninfected strains of the mosquitoAedes albopictus(Skuse) (Diptera: Culicidae), we assessed the effects on fitness of two stressors: temperature elevation (25°C vs. 37°C) and exposure to temephos insecticide (concentration range 0.0017−0.0167 mg/L) during larval development. Fitness was measured in terms of life history traits: percentage survival, development time and wing size. Insecticide treatment was associated with reduction in survival rates and wing size in both sexes, but did not affect development time orWolbachiaload. Temperature elevation by 12°C significantly reduced all four bionomic parameters observed in both sexes.Wolbachiadensity within individual adult mosquitoes was determined by using real‐time quantitative polymerase chain reaction (PCR) based on thewspgene. Both male and female adults had significantly lower densities ofWolbachiaafter larval rearing at the higher temperature.

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