To bait or not to bait? Optimizing the use of adult mosquito traps for monitoring arbovirus vector populations in La Réunion Island

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

doi:10.21203/rs.3.rs-1798972/v1

Cited by 2 publications

(1 citation statement)

References 28 publications

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“…In a eld experiment to compare different baiting schemes for adult traps -implemented in the same sites and vector season, we reported the same order of magnitude for the apparent densities of these populations, when adult traps were baited with CO 2 [47] , or when we set the ovitraps in vacoa canopy, with vacoa leaves for oviposition. The two studies were done -by chance, during a large DV outbreak which affected Saint-Joseph and many other municipalities.…”

Section: Ecology and DV Transmissionmentioning

confidence: 68%

Four shades of red: optimizing the use of oviposition traps to monitor mosquito populations of arbovirus vectors in La Reunion

Brouazin

Claudel

Lancelot

et al. 2022

Preprint

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Recently, several epidemics caused by mosquito-borne viruses - including dengue viruses (DV) have occurred in La Reunion and other Indian Ocean islands. Aedes albopictus and Ae. aegypti - two important DV vectors, co-occur in La Reunion. Aedes albopictus is the major DV vector, preponderant and widespread in the island. Aedes aegypti is localized in certain areas and shows a peculiar ecology, compared to other tropical populations of the same species. This study aimed at providing users (researchers, mosquito control operators, health managers) with a locally-validated oviposition traps (ovitraps) to monitor Aedes populations.A field experiment was achieved in Saint-Joseph - where both mosquito species occur in sympatry, to assess the effect of different ovitrap settings on their detection probability and apparent density. Preliminary surveys indicated black plastic ovitraps were the best traps. Vacoa trees (Pandanus utilis) were the only observed breeding sites for Ae. aegypti, shared with Ae. albopictus. They were the experimental units in a design considering three factors: trap position in the trees (ground vs canopy), the oviposition surface used in the trap (blotting paper vs. vacoa leaf), and addition of organic matter (fish food) to the trap water.The addition of organic matter to trap water was not an important factor in this study. On the ground, Ae. aegypti eggs were only found when vacoa leaves were used for oviposition. Their detection and apparent density increased greatly when ovitraps were located in the tree canopy. The main factor for Ae. albopictus was the oviposition surface, with a strong preference for blotting paper. However, with vacoa leaves, the detection was also close to 100%. Further laboratory studies indicated larvae survival was lower for a high egg density, combined with blotting paper as the oviposition surface.When monitoring mixed Aedes populations in La Reunion, we recommend the use of black plastic ovitraps, filled with tap water, placed at 1.50-to-2.00-m high in vacoa trees, with vacoa leaves as the oviposition surface.

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Section: Ecology and DV Transmissionmentioning

confidence: 68%

Four shades of red: optimizing the use of oviposition traps to monitor mosquito populations of arbovirus vectors in La Reunion

Brouazin

Claudel

Lancelot

et al. 2022

Preprint

Self Cite

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Optimization of oviposition trap settings to monitor populations of Aedes mosquitoes, vectors of arboviruses in La Reunion

Brouazin

Claudel

Lancelot

et al. 2022

Sci Rep

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Several dengue epidemics recently occurred in La Reunion, an island harboring two dengue viruses (DVs) vectors: Aedes albopictus, and Ae. aegypti, the former being the main local DV vector. Aedes aegypti shows a peculiar ecology, compared to other tropical populations of the same species. This study aimed to provide researchers and public-health users with locally validated oviposition traps (ovitraps) to monitor Aedes populations. A field experiment was performed in Saint-Joseph to assess the effect of different settings on the detection probability and apparent density of Aedes mosquitoes. Black plastic ovitraps were identified as the best choice. Vacoa trees (Pandanus utilis) were the only observed breeding sites for Ae. aegypti, shared with Ae. albopictus. They were the experimental units in a Latin square design with three factors: trap position in the trees (ground vs canopy), oviposition surface in the trap (blotting paper vs. vacoa leaf), and addition of organic matter to the trap water. The latter factor was found unimportant. On the ground, Ae. aegypti eggs were only found with vacoa leaves as the oviposition surface. Their detection and apparent density increased when ovitraps were located in the tree canopy. The main factor for Ae. albopictus was the oviposition surface, with a preference for blotting paper. In all trap settings, their detection was close to 100%. Larval survival was lower for a high egg density, combined with blotting paper as the oviposition surface. When monitoring mixed Aedes populations in La Reunion, we recommend using black plastic ovitraps, placed at 1.50-to-2.00-m high in vacoa trees, with vacoa leaves as the oviposition surface.

show abstract

To bait or not to bait? Optimizing the use of adult mosquito traps for monitoring arbovirus vector populations in La Réunion Island

Cited by 2 publications

References 28 publications

Four shades of red: optimizing the use of oviposition traps to monitor mosquito populations of arbovirus vectors in La Reunion

Four shades of red: optimizing the use of oviposition traps to monitor mosquito populations of arbovirus vectors in La Reunion

Optimization of oviposition trap settings to monitor populations of Aedes mosquitoes, vectors of arboviruses in La Reunion

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