The impact of oviposition-site deprivation in gravid females of Anopheles gambiae (Diptera: Culicidae) on fecundity, trophic behaviour and life expectancy

Govoétchan, Renaud; Sovi, Arthur; Aïkpon, Rock; Salako, Albert Sourou; Agbo, Frédéric Oké; Asidi, Alex; Akogbéto, Martin

doi:10.1017/s1742758413000349

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…gambiae in the dry season is particularly due to the fact that Anopheles adults are scattered in shelters for a summer diapause (aestivation), to ensure its survival [ 15 ]. Thus, sampling them is very difficult because, on one hand, they are resting in hiding, and on the other hand, they reduce the frequency of blood meals [ 26 ] as having significantly slowed the rate of ovarian development [ 27 ].…”

Section: Discussionmentioning

confidence: 99%

Evidence for perennial malaria in rural and urban areas under the Sudanian climate of Kandi, Northeastern Benin

Govoétchan

Gnanguenon

Azondékon

et al. 2014

Parasites & Vectors

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BackgroundIn arid settings, droughts usually lead to periods of very low or no malaria transmission. However, in rural Kandi (Sonsoro) in northeastern Benin, several malaria cases are often diagnosed during dry seasons. The underlying factors accounting for this phenomenon remain unknown.MethodsThe entomological profile of Sonsoro has been studied compared to a location in urban Kandi (Gansosso) for a period of one year. During this period, Anopheles larval habitats were investigated and populations of Anopheles gambiae s.l. were sampled by human landing catches in both areas. Enzyme-linked immunosorbent assays (ELISA) for Plasmodium falciparum circumsporozoite protein (CSP) were conducted on vector specimens and the entomological inoculation rates (EIR) were determined per season (wet versus dry) in each area. In addition, during the severe drought period, Rapid Diagnostic Tests (RDTs) were conducted on school children under the age 10 years in these areas to provide a global view of drought-malaria prevalence and to perform a crossing with entomological data in Kandi.ResultsOverall, An. gambiae s.l. was particularly abundant in rural Kandi compared to the urban area with a significant decrease of vector density in both sites during the dry season. In this period, larval sampling data identified household water sources as potential breeding sites in urban and rural Kandi. We also observed a significant seasonal variation of the infectivity rate in both areas but for each period (season), the EIR was higher in the rural site than in the urban. Data of P. falciparum detection was the reflection of entomological findings. The drought-malaria prevalence was 5.5 times higher in rural Kandi as compared to urban Kandi. The presence of a permanent water site and the low level of urbanization in rural Kandi were identified as a risk factor.ConclusionOur data showed a high level of malaria transmission in the municipality of Kandi. Household water source plays an important role in maintaining the breeding of anopheles larvae and the malaria transmission in Kandi. In rural settings, the proximity to permanent water sites could probably be the aggravating factor.

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Section: Discussionmentioning

confidence: 99%

Evidence for perennial malaria in rural and urban areas under the Sudanian climate of Kandi, Northeastern Benin

Govoétchan

Gnanguenon

Azondékon

et al. 2014

Parasites & Vectors

Self Cite

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“…The mean percentage of eggs hatched was 84.93 ± 0.47. In contrast, the study conducted by Govoetchan et al (2013) has shown a significant decline in egg hatch rate with the increase of the duration of oviposition site deprivation for a maximum of 15 days in both the KISUMU strain and wild strain of An. gambiae.…”

Section: March 2023mentioning

confidence: 77%

“…The mean adult longevity was 19.40 ± 0.29 days. Although Govoetchan et al (2013) has shown that the longevity of the gravid females of An. gambiae was higher than that of non-gravid females, oviposition site deprivation has not increased the survival of An.…”

Section: March 2023mentioning

confidence: 99%

Effect of oviposition-site deprivation on reproductive performance and life history parameters of dengue vector Aedes aegypti

Gunathilaka

Ganehiarachchi

2023

J. Natn. Sci. Foundation Sri Lanka

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Dengue and dengue haemorrhagic fever constitute one of the most significant arthropod-borne viral diseases that occur in tropical and subtropical regions in the world. Annually 390 million new dengue cases are being reported from the 128 dengue-endemic countries. Aedes aegypti is the primary vector that transmits the disease. Since the primary vector is a container breeder, source reduction appears to be a good vector control method. Source reduction limits the oviposition of females through oviposition-site deprivation. Therefore, the current study was conducted to determine the effect of oviposition-site deprivation on the fecundity, fertility, life-history parameters, and longevity of Ae. aegypti. Oviposition-site deprivation was enabled by delaying the access to the oviposition substrate. Female mosquitoes were allowed to access the oviposition substrate separately on the day of blood feeding and 2, 4, 6, and 8 days after blood feeding. The results showed that oviposition-site deprivation significantly increased fecundity with an increase in the number of egg retention days. The number of eggs laid by the female increased by 69% when the female was compelled to retain the eggs for 8 days. The highest recorded fecundity was 100 ± 5. Nevertheless, fertility, percentage larval mortality, total larval duration, pupal duration, and longevity were not affected by the number of egg retention days. Thus, it is imperative to have a clear awareness about the effect of oviposition-site deprivation on the reproductive performance of the vector mosquitoes when adopting vector control strategies.

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“…However, by the time a mosquito has completed egg development, parasite development may or may not be complete, although transmission to the next host is dependent on the mosquito locating an oviposition site to complete its ‘gonotrophic cycle’ [1]. While several studies suggest widespread changes in mosquito behavior and physiology associated with the gonotrophic cycle [2, 3, 4, 5, 6, 7, 8], few have determined if and how changes in oviposition status influences parasite development rates and transmission potential [9]; in general, measures of parasite fitness and transmission potential are performed in mosquitoes prevented from completing their gonotrophic cycle (e.g., see [10, 11, 12, 13] and references therein). A greater understanding of how parasite fitness is shaped by oviposition status of mosquitoes is important for at least two reasons.…”

Section: Introductionmentioning

confidence: 99%

Oviposition status and sugar availability influence measures of transmission potential in malaria-infected mosquitoes

Shiau,

Garcia-Diaz,

Kyle

et al. 2024

Preprint

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Background:Like other oviparous organisms, the gonotrophic cycle of mosquitoes is not complete until they have selected a suitable habitat to oviposit. In addition to the evolutionary constraints associated with selective oviposition behavior, the physiological demands relative to an organisms oviposition status also influences their nutrient requirement from the environment. Yet, studies that measure transmission potential (vectorial capacity or competence) of mosquito-borne parasites rarely consider if the rates of parasite replication and development could be influenced by these constraints resulting from whether mosquitoes have completed their gonotrophic cycle.Methods:Anopheles stephensimosquitoes were infected withPlasmodium bergheithe rodent analog of human malaria and maintained on 1% or 10% dextrose and either provided oviposition sites (oviposited herein) to complete their gonotrophic cycle or forced to retain eggs (non-oviposited). Transmission potential in the four groups was measured up to 27 days post-infection as 1) the rates of vector survival, 2) rates of sporozoite migration to the salivary glands (extrinsic incubation period or EIP), and 3), sporozoite densities.Results:In the two groups of oviposited mosquitoes, rates of sporozoite migration and densities in the salivary glands were clearly higher in mosquitoes fed 10% dextrose. In non-oviposited mosquitoes however, rates of sporozoite migration and densities were independent of sugar concentrations, although both measures were slightly lower than oviposited mosquitoes fed 10% dextrose. Rates of vector survival were higher in non-oviposited mosquitoes.Conclusions:Taken together, these results suggest vectorial capacity for malaria parasites may be dependent on nutrient availability and oviposition/gonotrophic status and as such, argue for more careful consideration of this interaction when estimating transmission potential; costs to parasite fitness and vector survival were buffered against changes in nutritional availability from the environment in non-oviposited mosquitoes, but not oviposited mosquitoes. In general, however, these patterns suggest parasite fitness may be dependent on complex interactions between physiological (nutrition) and evolutionary (egg-retention) trade-offs in the vector, with potential implications for disease transmission and management. For instance, while reducing availability of oviposition sites and environmental sources of nutrition are key components of integrated vector management strategies, their abundance and distribution is under strong selection pressure from the patterns associated with climate change.

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The impact of oviposition-site deprivation in gravid females of Anopheles gambiae (Diptera: Culicidae) on fecundity, trophic behaviour and life expectancy

Cited by 4 publications

References 16 publications

Evidence for perennial malaria in rural and urban areas under the Sudanian climate of Kandi, Northeastern Benin

Evidence for perennial malaria in rural and urban areas under the Sudanian climate of Kandi, Northeastern Benin

Effect of oviposition-site deprivation on reproductive performance and life history parameters of dengue vector Aedes aegypti

Oviposition status and sugar availability influence measures of transmission potential in malaria-infected mosquitoes

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