Optimization of adult mosquito trap settings to monitor populations of Aedes and Culex mosquitoes, vectors of arboviruses in La Reunion

Claudel, Iris; Brouazin, Ronan; Lancelot, Renaud; Gouagna, Louis‐Clément; Dupraz, Marlène; Baldet, Thierry; Bouyer, Jérémy

doi:10.1038/s41598-022-24191-9

Cited by 2 publications

(1 citation statement)

References 44 publications

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“…Released males are attracted by hosts, including humans 7 , and can swarm around them in the search of mates, a behaviour that is exploited to monitor their density through the Human Landing Catch method 8 . Alternatively, they can be trapped using CO 2 -baited adult traps 9 . Continuous, inundative releases of sterile males, like those requited for SIT, can lead to high sterile-to-wild male and male-to-female ratios, sometimes over 100 to 1, particularly when the target population is suppressed.…”

Section: Introductionmentioning

confidence: 99%

Mating harassment may boost the effectiveness of the sterile insect technique for Aedes mosquitoes

Zhang,

Maiga,

et al. 2024

Nat Commun

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The sterile insect technique is based on the overflooding of a target population with released sterile males inducing sterility in the wild female population. It has proven to be effective against several insect pest species of agricultural and veterinary importance and is under development for Aedes mosquitoes. Here, we show that the release of sterile males at high sterile male to wild female ratios may also impact the target female population through mating harassment. Under laboratory conditions, male to female ratios above 50 to 1 reduce the longevity of female Aedes mosquitoes by reducing their feeding success. Under controlled conditions, blood uptake of females from an artificial host or from a mouse and biting rates on humans are also reduced. Finally, in a field trial conducted in a 1.17 ha area in China, the female biting rate is reduced by 80%, concurrent to a reduction of female mosquito density of 40% due to the swarming of males around humans attempting to mate with the female mosquitoes. This suggests that the sterile insect technique does not only suppress mosquito vector populations through the induction of sterility, but may also reduce disease transmission due to increased female mortality and lower host contact.

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Section: Introductionmentioning

confidence: 99%

Mating harassment may boost the effectiveness of the sterile insect technique for Aedes mosquitoes

Zhang,

Maiga,

et al. 2024

Nat Commun

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Field evaluation of an automated mosquito surveillance system which classifies Aedes and Culex mosquitoes by genus and sex

González-Pérez,

Faulhaber,

Aranda

et al. 2024

Parasites Vectors

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Background Mosquito-borne diseases are a major concern for public and veterinary health authorities, highlighting the importance of effective vector surveillance and control programs. Traditional surveillance methods are labor-intensive and do not provide high temporal resolution, which may hinder a full assessment of the risk of mosquito-borne pathogen transmission. Emerging technologies for automated remote mosquito monitoring have the potential to address these limitations; however, few studies have tested the performance of such systems in the field. Methods In the present work, an optical sensor coupled to the entrance of a standard mosquito suction trap was used to record 14,067 mosquito flights of Aedes and Culex genera at four temperature regimes in the laboratory, and the resulting dataset was used to train a machine learning (ML) model. The trap, sensor, and ML model, which form the core of an automated mosquito surveillance system, were tested in the field for two classification purposes: to discriminate Aedes and Culex mosquitoes from other insects that enter the trap and to classify the target mosquitoes by genus and sex. The field performance of the system was assessed using balanced accuracy and regression metrics by comparing the classifications made by the system with those made by the manual inspection of the trap. Results The field system discriminated the target mosquitoes (Aedes and Culex genera) with a balanced accuracy of 95.5% and classified the genus and sex of those mosquitoes with a balanced accuracy of 88.8%. An analysis of the daily and seasonal temporal dynamics of Aedes and Culex mosquito populations was also performed using the time-stamped classifications from the system. Conclusions This study reports results for automated mosquito genus and sex classification using an optical sensor coupled to a mosquito trap in the field with highly balanced accuracy. The compatibility of the sensor with commercial mosquito traps enables the sensor to be integrated into conventional mosquito surveillance methods to provide accurate automatic monitoring with high temporal resolution of Aedes and Culex mosquitoes, two of the most concerning genera in terms of arbovirus transmission. Graphical Abstract

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Optimization of adult mosquito trap settings to monitor populations of Aedes and Culex mosquitoes, vectors of arboviruses in La Reunion

Cited by 2 publications

References 44 publications

Mating harassment may boost the effectiveness of the sterile insect technique for Aedes mosquitoes

Mating harassment may boost the effectiveness of the sterile insect technique for Aedes mosquitoes

Field evaluation of an automated mosquito surveillance system which classifies Aedes and Culex mosquitoes by genus and sex

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