Browsing by Author "Jayatunga, D. P. W."

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Effect of ABO and Rh blood groups on host preference, oviposition success, and development of laboratory‑reared Aedes aegypti
(International Journal of Tropical Insect Science, 2022) Galhena, G. K. D. N.; Ganehiarachchi, G. A. S. M.; Gunathilaka, R. A. K. M.; Jayatunga, D. P. W.
Aedes aegypti is the primary dengue vector in Sri Lanka that causes the massive public health problem of Dengue Fever (DF) and Dengue Hemorrhagic Fever (DHF) on the island. It is an anthropophilic mosquito that shows preferential feeding depending on the host blood type. Hence, the study was conducted to investigate the effects of human ABO and Rh blood groups on host attractiveness, feeding, oviposition and other life-history traits of Aedes aegypti. Data of DF and DHF patients were collected from some selected hospitals in the Western province. Subsequently, mated female Ae. aegypti mosquitoes were exposed to eight blood groups (A − , A + , B − , B + , AB − , AB + , O − , O + ) using human volunteers to investigate the land- ing and feeding preferences. Furthermore, oviposition success, adult longevity, progeny longevity, larval duration, larval mortality, pupal duration, and adult fecundity were examined. Accordingly, people with the O + blood group were the most typical group infected with DF and DHF in 2017 and 2018. However, the peak landing and feeding preferences were observed for O − . Besides, the current findings indicated that human ABO and Rh blood types did not significantly affect life-history parameters including oviposition success, larval duration, pupal duration, larval mortality, adult longevity, progeny longevity, and fecundity of Ae. aegypti. Eventually, it can be concluded that dengue infection risk varies with the ABO and Rh blood groups depending on their unequal prevalence in the community as well as their association with mosquito performance.
Effect of ABO and Rh blood groups on host preference, oviposition success, and development of laboratory‑reared Aedes aegypti
(African Association of Insect Scientists, 2023) Galhena, G. K. D. N.; Ganehiarachchi, G. A. S. M.; Gunathilaka, R. A. K. M.; Jayatunga, D. P. W.
(DF) and Dengue Hemorrhagic Fever (DHF) on the island. It is an anthropophilic mosquito that shows preferential feeding depending on the host blood type. Hence, the study was conducted to investigate the effects of human ABO and Rh blood groups on host attractiveness, feeding, oviposition and other life-history traits of Aedes aegypti. Data of DF and DHF patients were collected from some selected hospitals in the Western province. Subsequently, mated female Ae. aegypti mosquitoes were exposed to eight blood groups (A−, A+,B−,B+,AB−,AB+,O−,O+) using human volunteers to investigate the landing and feeding preferences. Furthermore, oviposition success, adult longevity, progeny longevity, larval duration, larval mortality, pupal duration, and adult fecundity were examined. Accordingly, people with the O+ blood group were the most typical group infected with DF and DHF in 2017 and 2018. However, the peak landing and feeding preferences were observed for O−. Besides, the current findings indicated that human ABO and Rh blood types did not significantly affect life-history parameters including oviposition success, larval duration, pupal duration, larval mortality, adult longevity, progeny longevity, and fecundity of Ae. aegypti. Eventually, it can be concluded that dengue infection risk varies with the ABO and Rh blood groups depending on their unequal prevalence in the community as well as their association with mosquito performance.
Effect of delayed mating on reproductive performance and life-history parameters of dengue vector Aedes aegypti
(Cambridge University Press, 2022) Gunathilaka, R. A. K. M.; Jayatunga, D. P. W.; Ganehiarachchi, G. A. S. M.
Dengue is a fast-spreading mosquito-borne viral disease in the world. The primary vector of the disease is Aedes aegypti of the family Culicidae. It is a container breeder. Since a vaccine or a drug has not been developed against dengue, vector control appears to be the best method so far to control dengue. The current study was conducted to determine the effect of delayed mating on fecundity, fertility, life-history parameters, and longevity of Ae. aegypti, because such information can help formulate integrated vector control strategies involving the release of sub-fertile males into the environment. During this study, mating was delayed by 0, 2, 5, and 8 days after emergence. Males and females were separated by hand at the pupal stage using the apparent size difference of the sexes. The separated pupae were kept in separate cages until emergence. When mating was delayed for 8 days, the number of eggs laid by the female declined by 38%, and the percentage number of eggs that hatched reduced by 24%. However, the percentage of larval mortality, duration of the larval and pupal periods, and adult longevity were not significantly affected. The current results indicate that delayed mating has a negative effect on the reproductive performance of vector mosquitoes.
Effect of delayed mating on reproductive performance and life-history parameters of dengue vector Aedes aegypti
(Bulletin of Entomological Research, 2022) Gunathilaka, R. A. K. M.; Jayatunga, D. P. W.; Ganehiarachchi, G. A. S. M.
Dengue is a fast-spreading mosquito-borne viral disease in the world. The primary vector of the disease is Aedes aegypti of the family Culicidae. It is a container breeder. Since a vaccine or a drug has not been developed against dengue, vector control appears to be the best method so far to control dengue. The current study was conducted to determine the effect of delayed mating on fecundity, fertility, life-history parameters, and longevity of Ae. aegypti, because such information can help formulate integrated vector control strategies involving the release of sub-fertile males into the environment. During this study, mating was delayed by 0, 2, 5, and 8 days after emergence. Males and females were separated by hand at the pupal stage using the apparent size difference of the sexes. The separated pupae were kept in separate cages until emergence. When mating was delayed for 8 days, the number of eggs laid by the female declined by 38%, and the percentage number of eggs that hatched reduced by 24%. However, the percentage of larval mortality, duration of the larval and pupal periods, and adult longevity were not significantly affected. The current results indicate that delayed mating has a negative effect on the reproductive performance of vector mosquitoes.