Effect of Salinity on Temephos Toxicity to Larvae of Aedes sollicitans (Diptera: Culicidae)

Aedes sollicitans (Walker) (Diptera: Culicidae) is an important vector of eastern equine encephalitis as well as several other mosquito-borne brain fevers. The larvae are salt-tolerant and develop in salt marshes with highly varying salinity. The effect of salinity on the toxicity of one of the majo...

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Bibliographic Details
Published in:Journal of medical entomology 2007-07, Vol.44 (4), p.705-708
Main Authors: Huang, Shaoming, Brattsten, L. B.
Format: Article
Language:English
Subjects:
Aedes sollicitans
Animal, plant and microbial ecology
Animals
Applied ecology
Biological and medical sciences
body size
Culicidae - drug effects
Culicidae - growth & development
Ecotoxicology, biological effects of pollution
Female
Fresh Water - parasitology
freshwater
Fundamental and applied biological sciences. Psychology
Insecticides - toxicity
Larva - drug effects
larvae
larvicides
Medically important nuisances and vectors, pests of stored products and materials: population survey and control
mortality
Oviposition
saline water
salinity
salt concentration
SHORT COMMUNICATIONS
Sodium Chloride - pharmacology
Temefos - toxicity
temephos
toxicity
toxicity testing
Vectors. Intermediate hosts
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Summary:Aedes sollicitans (Walker) (Diptera: Culicidae) is an important vector of eastern equine encephalitis as well as several other mosquito-borne brain fevers. The larvae are salt-tolerant and develop in salt marshes with highly varying salinity. The effect of salinity on the toxicity of one of the major larvicidal organophosphates, temephos, was evaluated in two groups of larvae raised either in freshwater or water with salinity ranging from 1 to 3.5%. When larvae were raised in freshwater, low salinity (1–3.5%) decreased the toxicity and high salinity (5%) increased the toxicity. In contrast, salinity did not change the toxicity to larvae raised in saltwater. Temephos treatment and salinity seemed to have cross-interaction for the larvae raised in freshwater. High salinity also caused reduction in larval body size, and 5% salinity alone caused mortality for larvae raised in freshwater, suggesting that preadaptation to saltwater in the early instars is essential for survival in later instars at high salinity.
ISSN:0022-2585
1938-2928
DOI:10.1603/0022-2585%282007%2944%5B705%3AEOSOTT%5D2.0.CO%3B2