Impacts of diurnal temperature and larval density on aquatic development of Aedes aegypti

Zapletal, Josef; Erraguntla, Madhav; Adelman, Zach N.; Myles, K.M.; Lawley, Mark

doi:10.1371/journal.pone.0194025

Cited by 25 publications

(33 citation statements)

References 39 publications

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“…The impact of temperature and humidity on the life-history, physiology, behaviour and ecology of Ae. aegypti has been extensively investigated under laboratory conditions [108][109][110][111][112][113][114][115][116] [99]. Such variability seems to be common and related to optimal humidity and temperature conditions available during such hours [117,118].…”

Section: Discussionmentioning

confidence: 99%

The Mosquito Electrocuting Trap As An Exposure-Free Method For Measuring Human Biting Rates ByAedesMosquito Vectors

Ortega-López

Pondeville

Kohl

et al. 2019

Preprint

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BackgroundEntomological monitoring of Aedes vectors has largely relied on surveillance of larvae, pupae and non-host-seeking adults, which have been poorly correlated with human disease incidence. Exposure to mosquito-borne diseases can be more directly estimated using Human Landing Catches (HLC), although this method is not recommended for Aedes-borne arboviruses.We evaluated a new method previously tested with malaria vectors, the Mosquito Electrocuting Trap (MET) as an exposure-free alternative for measuring landing rates of Aedes mosquitoes on people. Aims were to 1) compare the MET to the BG-sentinel (BGS) trap gold standard approach for sampling host-seeking Aedes vectors; 2) characterize the diel activity of Aedes vectors and their association with microclimatic conditions. MethodsThe study was conducted over 12 days in Quinindé -Ecuador in May 2017. Mosquito sampling stations were set up in the peridomestic area of four houses. On each day of sampling, each house was allocated either a MET or a BGS trap, which were rotated amongst the four houses daily in a Latin square design. Mosquito abundance and microclimatic conditions were recorded hourly at each sampling station between 07:00-19:00 hours to assess variation between vector abundance, trapping methods, and environmental conditions. All Aedes aegypti females were tested for the presence of Zika (ZIKV), dengue (DENV) and chikungunya (CHIKV) viruses.3 ResultsA higher number of Ae. aegypti females were found in MET than in BGS collections, although no statistically significant differences in mean Ae. aegypti abundance between trapping methods were found. Both trapping methods indicated female Ae. aegypti had bimodal patterns of host seeking, being highest during early morning and late afternoon hours. Mean Ae. aegypti daily abundance was negatively associated with daily temperature. No infection by ZIKV, DENV or CHIKV was detected in any Aedes mosquitoes caught by either trapping method. ConclusionWe conclude the MET performs at least as well as the BGS standard, and offers the additional advantage of direct measurement of per capita human biting rates. If detection of arboviruses can be confirmed in MET-collected Aedes in future studies, this surveillance method could provide a valuable tool for surveillance and prediction on human arboviral exposure risk. BACKGROUNDMosquito--borne viruses (arboviruses) are an important cause of diseases in humans and animals. In 2017, estimates suggested that mosquitoes were responsible for approximately 137 millions human arboviral infections with dengue (DENV), chikungunya (CHIKV), and Zika virus (ZIKV) being the most important [1]. Arbovirus transmission to humans depends on multiple factors that involve spatial movement and immunity of human populations [2-7], socioeconomic factors and access to basic services (especially water) [8][9][10][11], and the ecology and distribution of the mosquito vectors that transmit them [12][13][14][15][16][17][18][19]. These factors combine to determine the distribution and intens...

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Section: Discussionmentioning

confidence: 99%

The Mosquito Electrocuting Trap As An Exposure-Free Method For Measuring Human Biting Rates ByAedesMosquito Vectors

Ortega-López

Pondeville

Kohl

et al. 2019

Preprint

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“…This could be due to the fluctuations, larval density and low-volume container parameters in predicting the effects. Although each factor individually influences the Aedes mosquito population, interaction between various factors will have a more significant impact on the final proportion of the mosquitoes [39–40]. The mathematical model of temperature transmission was used to integrate the data obtained from the laboratory tests.…”

Section: Discussionmentioning

confidence: 99%

Small-scale field assessment of efficacy of the autodissemination approach against Aedes sp. in an urban area

Ngesom¹,

Othman

Bahauddin³

et al. 2020

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This is the first study to evaluate the efficacy of an autodissemination approach, as suggested by WHO. Therefore, the efficacy of an autodissemination approach in small-scale field trials against wild Aedes sp. population was evaluated in an urbanized setting, Malaysia. Lethal ovitraps enhanced with pyriproxyfen were used to control Aedes sp. populations at treatment sites, with the autodissemination activity was assessed using the WHO larval bioassays. Lethal ovitraps enhanced with pyriproxyfen effectively reduced of Aedes sp. population. All autodissemination stations were shown to be visited by Aedes sp. mosquitoes with 100% complete inhibition against eggs and larvae development. In the larvae bioassay, pupae mortality ranged from 14 to 40%. Statistically, a significant reduction of Aedes sp. population in the treatment sites compared to the untreated areas. The study proved for the autodissemination of pyriproxyfen to breeding habitats by wild Aedes sp. This technique is highly potentially for vector control activities. Future evaluation should focus on large-scale field trials.Author SummarySince 2012, Dataran Automobil, Seksyen 15, Shah Alam, was declared as one of the dengue hotspot areas. Major vector control activities were conducted by government, NGOs, social communities, and local authorities, but the number still rising. We conducted a new invention of autodissemination concepts in this area by an entomological study on mosquito populations reduction and dispersal abilities of the technique. We found that the technique has proven to control mosquito populations, but the other factors such as epidemiology link still unclear and need further clarification. Our finding highlighted the effectiveness of autodissemination strategies that can be considered as one of the alternative tools in vector control programme.

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“…Experimental data was obtained from previously published results in Zapletal et al [30]. The experiments performed examined various aspects of aquatic Ae.…”

Section: Methodsmentioning

confidence: 99%

“…In this study, we utilize results from experiments detailed by Zapletal et al [30] and fit a regression model to predict the rates of Ae. aegypti pupation, emergence and mortality under varying conditions of average temperature, diurnal temperature range, and larval density.…”

Section: Introductionmentioning

confidence: 99%

Predicting Aquatic Development and Mortality Rates of Aedes Aegypti

Zapletal

Gupta

Erraguntla

et al. 2018

Preprint

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20Mosquito-borne pathogens continue to be a significant burden within human populations, with Aedes 21 aegypti continuing to spread dengue, chikungunya, and Zika virus throughout the world. Using data from 22 a previously conducted study, a linear regression model was constructed to predict the aquatic 23 development rates based on the average temperature, temperature fluctuation range, and larval density. 24 Additional experiments were conducted with different parameters of average temperature and larval 25 density to validate the model. Using a paired t-test, the model predictions were compared to experimental 26 data and showed that the prediction models were not significantly different for average pupation rate, 27 adult emergence rate, and juvenile mortality rate. The models developed will be useful for modeling and 28 estimating the number of Aedes aegypti in the environment under different temperature, diurnal 29 temperature variations, and larval densities. 30 Author Summary 31 Using experimental data from experiments conducted on Aedes aegypti, we formulated regression 32 models to predict pupation, adult emergence, and juvenile mortality rates based on average temperature, 33 temperature fluctuation range, and larval density. The prediction models produced were shown to 34 account for high levels of variation within the data. Validation was performed by comparing omitted data 35 sets to the predictions generated by our models. Our results show that the models produce results that 36 are not significantly different from the experimental results and are capable of predicting aquatic 37 development rates of Ae. aegypti. 38

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Impacts of diurnal temperature and larval density on aquatic development of Aedes aegypti

Cited by 25 publications

References 39 publications

The Mosquito Electrocuting Trap As An Exposure-Free Method For Measuring Human Biting Rates ByAedesMosquito Vectors

The Mosquito Electrocuting Trap As An Exposure-Free Method For Measuring Human Biting Rates ByAedesMosquito Vectors

Small-scale field assessment of efficacy of the autodissemination approach against Aedes sp. in an urban area

Predicting Aquatic Development and Mortality Rates of Aedes Aegypti

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