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gambiae

NOT Open Access | Disease Vector Relative Spatio-Temporal Abundances to Water Bodies and Thermal Fitness Across Malaria Endemic Semi-Arid Areas

October 28, 2020 - 10:33 -- NOT Open Access
Author(s): 
Buxton M, Wasserman RJ, Nyamukondiwa C
Reference: 
J Med Entomol. 2020 Oct 27:tjaa221

The biophysical environment plays an important role in the spatio-temporal abundance and distribution of mosquitoes. This has implications for the spread of vectors and diseases they cause across diverse landscapes. Here, we assessed vector mosquito abundances in relation to large water bodies, from three malaria districts in a semi-arid environment.

Not Open Access | New distribution record of Anopheles rivulorum-like from Sadiola, Mali, with notes on malaria vector insecticide resistance

October 28, 2020 - 09:28 -- NOT Open Access
Author(s): 
Wragge SE, Venter N, Touré D, Hunt RH, Coetzee M
Reference: 
Trans R Soc Trop Med Hyg. 2020 Oct 22:traa113

The SEMOS gold mine in Sadiola, southwestern Mali, has been implementing a malaria vector control programme for 15 y using indoor residual house spraying and sporadic larval control. Periodic screening of the vector populations have been carried out over the years to provide information to the control programme, mainly on vector species present and their insecticide resistance status. The data from five entomological surveys, carried out in 2006, 2011, 2014, 2016 and 2018, are presented.

Genome variation and population structure among 1142 mosquitoes of the African malaria vector species Anopheles gambiae and Anopheles coluzzii

October 7, 2020 - 14:38 -- Open Access
Author(s): 
Anopheles gambiae 1000 Genomes Consortium, Chris S Clarkson, Alistair Miles, Dominic P Kwiatkowski, et al.
Reference: 
Genome Res. 2020 Oct;30(10):1533-1546

Mosquito control remains a central pillar of efforts to reduce malaria burden in sub-Saharan Africa. However, insecticide resistance is entrenched in malaria vector populations, and countries with a high malaria burden face a daunting challenge to sustain malaria control with a limited set of surveillance and intervention tools.

Leveraging big data for public health: Mapping malaria vector suitability in Malawi with Google Earth Engine

August 5, 2020 - 16:15 -- Open Access
Author(s): 
Frake AN, Peter BG, Walker ED, Messina JP
Reference: 
PLoS ONE 15(8): e0235697

In an era of big data, the availability of satellite-derived global climate, terrain, and land cover imagery presents an opportunity for modeling the suitability of malaria disease vectors at fine spatial resolutions, across temporal scales, and over vast geographic extents. Leveraging cloud-based geospatial analytical tools, we present an environmental suitability model that considers water resources, flow accumulation areas, precipitation, temperature, vegetation, and land cover. In contrast to predictive models generated using spatially and temporally discontinuous mosquito presence information, this model provides continuous fine-spatial resolution information on the biophysical drivers of suitability.

NOT Open Access | Male swarming aggregation pheromones increase female attraction and mating success among multiple African malaria vector mosquito species

August 5, 2020 - 14:33 -- NOT Open Access
Author(s): 
Mozūraitis R, Hajkazemian M, Zawada JW, Szymczak J, Pålsson K, Sekar V, Biryukova I, Friedländer MR, Koekemoer LL, Baird JK, Borg-Karlson AK, Emami SN
Reference: 
Nat Ecol Evol. 2020 Aug 3

Accumulating behavioural data indicate that aggregation pheromones may mediate the formation and maintenance of mosquito swarms. However, chemical cues possibly luring mosquitoes to swarms have not been adequately investigated, and the likely molecular incitants of these complex reproductive behaviours remain unknown. Here we show that males of the important malaria vector species Anopheles arabiensis and An. gambiae produce and release aggregation pheromones that attract individuals to the swarm and enhance mating success.

Quantifying flight aptitude variation in wild Anopheles gambiae in order to identify long-distance migrants

July 22, 2020 - 15:47 -- Open Access
Author(s): 
Roy Faiman, Alpha S. Yaro, Tovi Lehmann, et al.
Reference: 
Malaria Journal 2020 19:263, 22 July 2020

In the West African Sahel, mosquito reproduction is halted during the 5–7 month-long dry season, due to the absence of surface waters required for larval development. However, recent studies have suggested that both Anopheles gambiae sensu stricto (s.s.) and Anopheles arabiensis repopulate this region via migration from distant locations where larval sites are perennial. Anopheles coluzzii engages in more regional migration, presumably within the Sahel, following shifting resources correlating with the ever-changing patterns of Sahelian rainfall. Understanding mosquito migration is key to controlling malaria—a disease that continues to claim more than 400,000 lives annually, especially those of African children. Using tethered flight data of wild mosquitoes, the distribution of flight parameters were evaluated as indicators of long-range migrants versus appetitive flyers, and the species specific seasonal differences and gonotrophic states compared between two flight activity modalities. Morphometrical differences were evaluated in the wings of mosquitoes exhibiting high flight activity (HFA) vs. low flight activity (LFA).

Semi-field evaluation of the cumulative effects of a “Lethal House Lure” on malaria mosquito mortality

September 10, 2019 - 15:17 -- Open Access
Author(s): 
Antoine M. G. Barreaux, Welbeck A. Oumbouke, Innocent Zran Tia, N’guessan Brou, Alphonsine A. Koffi, Raphaël N’guessan and Matthew B. Thomas
Reference: 
Malaria Journal 2019 18:298, 30 August 2019

There is growing interest in the potential to modify houses to target mosquitoes with insecticides or repellents as they search for human hosts. One version of this ‘Lethal House Lure’ approach is the In2Care® EaveTube, which consists of a section of polyvinyl chloride (PVC) pipe fitted into a closed eave, with an insert comprising electrostatic netting treated with insecticide powder placed inside the tube. Preliminary evidence suggests that when combined with screening of doors and windows, there is a reduction in entry of mosquitoes and an increase in mortality. However, the rate of overnight mortality remains unclear. The current study used a field enclosure built around experimental huts to investigate the mortality of cohorts of mosquitoes over multiple nights.

Antennal transcriptome profiles of anopheline mosquitoes reveal human host olfactory specialization in Anopheles gambiae

November 5, 2013 - 16:34 -- Open Access
Author(s): 
Rinker DC, Zhou X, Pitts RJ, Rokas A, Zwiebel LJ
Reference: 
BMC Genomics 2013, 14 :749 (1 November 2013)
MalariaWorld

This study improves our understanding of the molecular evolution of chemoreceptors in closely related anophelines and suggests possible mechanisms that underlie the behavioral distinctions in host seeking that, in part, account for the differential vectorial capacity of these mosquitoes.

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