Abstract
Biochemical synthetic pyrethroids, deltamethrin are presently used insecticides for the control of mosquito vector-borne diseases in worldwide. Mosquito re-emergence with diseases becoming a serious problem due to development of insecticide resistance. The comprehensive knowledge on the underlying mechanisms of resistance against deltamethrin is required for implementation of an efficient vector control programme. The assessment of the biological fitness of a mosquito strain exposed to insecticide pressure is extremely vital because it provides information on the development of resistance. In the present study, the adult stage of malaria vector, Anopheles stephensi, was designated for the study of deltamethrin resistance (F40 generations). The non-blood-fed, laboratory-reared females to sub-lethal doses of deltamethrin (0.004%, 0.005%, 0.007%, or 0.01%) exposed to every generation for up to F40. The adult mosquito susceptibility was performed by WHO standard method for evaluation. After 24 h, mortality was recorded in both treated and control groups. Therefore, the biological fitness characteristics such as feeding, fecundity, hatchability, egg retention, immature duration, adult emergence, and adult life span were studied to assess the exposed deltamethrin under selection pressure as compared to the unexposed (control) population. The laboratory selection of An. stephensi exposed deltamethrin over the generations were diminished its biological fitness. Information on biological fitness including reproductive potential of mosquito strain under selection pressure against deltamethrin is incredibly necessary because it would facilitate in resistance management. Baseline information gives in this experiment will guide for future studies on the susceptibilities of wild malaria mosquito populations in India.
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The authors would like to thank the authorities of Annamalai University. The authors are grateful to Dr. A. Subramaniyan, Professor and Head, Department of Zoology for the laboratory facilities provided.
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The authors are thankful to University Grants Commission (UGC), Government of India, New Delhi under the scheme of Dr. D.S. Kothari Post Doctoral Fellowship (DSKPDF), (BL/19–20/0208) for providing financial support for the present work.
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Dr. Palani Aarumugam is the prime investigator who worked in the project. Writing—methodology and formal analysis. He helped in collection and rearing of mosquitoes and assisted in statistical analyses. Dr. Kalimuthu Kovendan has supervised conceptualization, designing, writing—original draft preparation, review, editing, scientific investigation and project administration. Dr. Siva Kamalakannan have evaluated scientific review and consultation. Dr. Arulsamy Jebanesan have evaluated for standard formal analysis and scientific consultation. List of the authors have fully read and agreed to prepare the manuscript.
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Aarumugam, P., Kovendan, K., Kamalakannan, S. et al. Chemical Exposure of Synthetic Pyrethroid on Deltamethrin Under the Selection Pressure over the Generations: A Reproductive Potential Study of Anopheles stephensi. Appl Biochem Biotechnol (2024). https://doi.org/10.1007/s12010-024-04911-9
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DOI: https://doi.org/10.1007/s12010-024-04911-9