Optimization of oviposition trap settings to monitor populations of Aedes mosquitoes, vectors of arboviruses in La Reunion
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 stu...
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Published in | Scientific reports Vol. 12; no. 1; pp. 18450 - 14 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
London
Nature Publishing Group UK
02.11.2022
Nature Publishing Group Nature Portfolio |
Subjects | |
Online Access | Get full text |
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Summary: | 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. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 2045-2322 2045-2322 |
DOI: | 10.1038/s41598-022-23137-5 |