Mosquito Attractants

Journal of Chemical Ecology, Journal Year: 2021, Volume and Issue: 47(4-5), P. 351 - 393

Published: March 16, 2021

Language: Английский

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The behaviour of adult Anopheles gambiae, sub-Saharan Africa’s principal malaria vector, and its relevance to malaria control: a review

Malaria Journal, Journal Year: 2024, Volume and Issue: 23(1)

Published: May 23, 2024

Abstract Background Mosquitoes of the Anopheles gambiae complex are one major vectors malaria in sub-Saharan Africa. Their ability to transmit this disease public health importance is dependent on their abundance, biting behaviour, susceptibility and survive long enough parasites. A deeper understanding behaviour can be exploited for improving vector surveillance control. Findings Adult mosquitoes emerge from aquatic habitats at dusk. After a 24 h teneral period, which cuticle hardens adult matures, they may disperse random search upwind mate or feed. Mating generally takes place dusk swarms that form over species-specific ‘markers’. Well-nourished females before blood-feeding, but reverse true poorly-nourished insects. Females monogamous only once whilst males, feed nectar, swarm nightly potentially up four times. able locate hosts by following carbon dioxide odour gradients. When close proximity host, visual cues, temperature relative humidity also used. Most blood-feeding occurs night, indoors, with entering houses mainly through gaps between roof walls. With exception first feed, gonotrophically concordant blood meal gives rise complete egg batch. Egg development two three days depending temperature. Gravid leave resting sites They attracted water gradients volatile chemicals provide suitable habitat lay eggs. Conclusion Whilst traditional interventions, using insecticides, target additional protection achieved spatial repellents outdoors, attractant traps house modifications prevent mosquito entry. Future research variability movement across landscape, light vision, reproductive barriers gene flow, male evolutionary changes could lead an improvement better methods control reducing current over-reliance indoor application insecticides.

Language: Английский

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EggCountAI: a convolutional neural network-based software for counting of Aedes aegypti mosquito eggs

Parasites & Vectors, Journal Year: 2023, Volume and Issue: 16(1)

Published: Oct. 2, 2023

Mosquito-borne diseases exert a huge impact on both animal and human populations, posing substantial health risks. The behavioural fitness traits of mosquitoes, such as locomotion fecundity, are crucial factors that influence the spread diseases. In existing egg-counting tools, each image requires separate processing with adjustments to various parameters intensity threshold egg area size. Furthermore, accuracy decreases significantly when dealing clustered or overlapping eggs. To overcome these issues, we have developed EggCountAI, Mask Region-based Convolutional Neural Network (RCNN)-based free automatic tool for Aedes aegypti mosquitoes.The study design involves developing EggCountAI counting mosquito eggs comparing its performance two commonly employed tools-ICount MECVision-using 10 microscopic macroscopic images laid by females paper strip. results were validated through manual strips using ImageJ software. Two different models trained enhance detection accuracy, achieving mean average precision, recall, F1-scores 0.92, 0.90, 0.91 model, 0.91, 0.90 respectively. automatically counts in folder containing strip images, offering adaptable filtration handling impurities varying sizes.The obtained from highlight remarkable performance, overall 98.88% micro 96.06% macro images. outperformed ICount MECVision, 81.71% 82.22% while MECVision achieved 68.01% 51.71% also excelled other statistical parameters, absolute error 1.90 micro, 74.30 macro, strong correlation R-squared value (0.99) macro. superior was most evident eggs.Accurate enables identification preferred egg-laying sites facilitates optimal placement oviposition traps, enhancing targeted vector control efforts disease transmission prevention. future research, holds potential extend application monitor feeding preferences.

Language: Английский

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Egg-laying by female Aedes aegypti shapes the bacterial communities of breeding sites

BMC Biology, Journal Year: 2023, Volume and Issue: 21(1)

Published: April 26, 2023

Abstract Background Aedes aegypti , the main arboviral mosquito vector, is attracted to human dwellings and makes use of human-generated breeding sites. Past research has shown that bacterial communities associated with such sites undergo compositional shifts as larvae develop exposure different bacteria during larval stages can have an impact on development life-history traits. Based these facts, we hypothesized female Ae. shape oviposition a form niche construction favor offspring fitness. Results To test this hypothesis, first verified gravid females act mechanical vectors bacteria. We then elaborated experimental scheme site microbiota. Five groups were set up sterile aqueous solution food, subsequently exposed (1) environment alone, (2) surface-sterilized eggs, (3) unsterilized (4) non-egg laying female, or (5) by female. The microbiota differently treated was assessed amplicon-oriented DNA sequencing once from eggs had completed formed pupae. Microbial ecology analyses revealed significant differences between five treatments in terms diversity. In particular, between-treatment abundance profiles detected, showing induce decrease microbial alpha diversity through oviposition. addition, indicator species analysis pinpointed taxa predicting values fidelity coefficients for samples which single laid eggs. Furthermore, provide evidence regarding how one taxa, Elizabethkingia exerts positive effect fitness larvae. Conclusions Ovipositing composition community site, promoting certain over those prevailing environment. Among bacteria, found known symbionts showed they improve if present water where are laid. deem oviposition-mediated shaping initiated

Language: Английский

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Chemical Ecology and Management of Dengue Vectors

Annual Review of Entomology, Journal Year: 2023, Volume and Issue: 69(1), P. 159 - 182

Published: Aug. 25, 2023

Dengue, caused by the dengue virus, is most widespread arboviral infectious disease of public health significance globally. This review explores communicative function olfactory cues that mediate host-seeking, egg-laying, plant-feeding, and mating behaviors in

Language: Английский

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Female Aedes aegypti mosquitoes use communal cues to manage population density at breeding sites

Communications Biology, Journal Year: 2024, Volume and Issue: 7(1)

Published: Jan. 31, 2024

Where a female mosquito lays her eggs creates the conditions for reproductive success. Here we identify communal behavior among ovipositing mosquitoes. When choosing equal breeding sites, gravid Aedes aegypti aggregate more often than expected. This aggregation occurs when water contact is restricted and does not require presence of eggs. Instead, regulated by number females present at site. Using assays with both occupied empty oviposition show that Orco olfactory co-receptor carbon dioxide receptor, Gr3, detect orco mutants in suggesting attractive cues influence to associate one another. Gr3 mutant do prefer either site, CO

Language: Английский

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Mosquito-disseminated pyriproxyfen for mosquito-borne disease control in Belo Horizonte, Brazil: a pragmatic, before–after control–intervention paired-series trial

The Lancet Infectious Diseases, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 1, 2024

Language: Английский

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Spectral preferences of mosquitos are altered by odors

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 6, 2025

Abstract Vision underlies many important behaviors in insects generally and mosquitos specifically. Mosquito vision plays a role predator avoidance, mate finding, oviposition, locating vertebrate hosts, vectoring disease. Recent work has shown that when sensitized to CO2, the visual responses of Aedes aegypti are wavelength-dependent, but little is known about how other olfactory stimuli can modulate responses. The cues associated with flowers, or oviposition sites differs substantially it possible odors might prime mosquito system respond these different resources. To investigate interplay cues, we adapted previously used wind tunnel bioassays use quasi-monochromatic targets (390-740 nm) created novel LED synth. We coupled CO2 representative floral nectar assessed via 3D tracking female mosquitos. When alone present, observe lower preference for wavelengths green portion visible spectrum gradual increase as moved towards violet red ends spectrum. However, both flowers sites, observed significant increases (475-575 stimuli. In contrast host odor was saw increased across entire These shifts spectral preferences suggest not fixed shift depending on behavioral context.

Language: Английский

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Duckweeds produce strong oviposition avoidance and high larval mortality in invasive Aedes mosquitoes

The Journal of Basic and Applied Zoology, Journal Year: 2025, Volume and Issue: 86(1)

Published: March 2, 2025

Abstract Background We examined how two invasive mosquito species, Asian tiger mosquitoes, Aedes albopictus , and rock pool A. japonicus responded to the presence of duckweeds when ovipositing these plants affected larval survivorship found. Since have been shown increase egg-laying but kill larvae in some they could be used as a natural form biocontrol. A total four experiments were conducted 2019 2022 that quantified number eggs laid percent survival their sites with without Spirodela polyrhiza Wolffia arrhizal . Results Females both species significantly fewer duckweeds, increased mortality. In was 0% duckweeds. Conclusions Unfortunately, our results suggest biological control mosquitoes using appears less promising given ability females detect avoid plants.

Language: Английский

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Reproductive Trade-Offs in Culex pipiens: Effects of CYV Infection and Delayed Mating

Insects, Journal Year: 2025, Volume and Issue: 16(3), P. 252 - 252

Published: March 1, 2025

Arbovirus control strategies often target vector reproductive dynamics, with insect-specific viruses (ISVs) like Culex Y virus (CYV) offering potential as eco-friendly approaches by influencing mosquito reproduction without affecting humans or animals. This study investigated the interplay between autogeny, anautogeny, nutrient availability, and viral infection their effect on success in pipiens biotype molestus quinquefasciatus. CYV had a minimal impact parameters, even after five-day incubation period. Autogeny enabled Cx. to produce eggs blood meals, yet older females (3–5 days post-emergence) showed reduced unrelated deficiency, blood-feeding did not restore egg production. These findings demonstrate that age affects but quinquefasciatus suggest has negligible direct effects reproduction. work enhances our understanding of ISV biology ecology, supporting development innovative, sustainable arbovirus-control strategies.

Language: Английский

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