Water level flux in household containers in Vietnam--a key determinant of Aedes aegypti population dynamics.

We examined changes in the abundance of immature Aedes aegypti at the household and water storage container level during the dry-season (June-July, 2008) in Tri Nguyen village, central Vietnam. We conducted quantitative immature mosquito surveys of 171 containers in the same 41 households, with repl...

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Autores principales:	Jason A L Jeffery, Archie C A Clements, Yen Thi Nguyen, Le Hoang Nguyen, Son Hai Tran, Nghia Trung Le, Nam Sinh Vu, Peter A Ryan, Brian H Kay
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f20f21f3969d49a8be5dcb1831c2f5ce
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spelling	oai:doaj.org-article:f20f21f3969d49a8be5dcb1831c2f5ce2021-11-18T07:11:20ZWater level flux in household containers in Vietnam--a key determinant of Aedes aegypti population dynamics.1932-620310.1371/journal.pone.0039067https://doaj.org/article/f20f21f3969d49a8be5dcb1831c2f5ce2012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22911683/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203We examined changes in the abundance of immature Aedes aegypti at the household and water storage container level during the dry-season (June-July, 2008) in Tri Nguyen village, central Vietnam. We conducted quantitative immature mosquito surveys of 171 containers in the same 41 households, with replacement of samples, every two days during a 29-day period. We developed multi-level mixed effects regression models to investigate container and household variability in pupal abundance. The percentage of houses that were positive for I/II instars, III/IV instars and pupae during any one survey ranged from 19.5-43.9%, 48.8-75.6% and 17.1-53.7%, respectively. The mean numbers of Ae. aegypti pupae per house ranged between 1.9-12.6 over the study period. Estimates of absolute pupal abundance were highly variable over the 29-day period despite relatively stable weather conditions. Most variability in pupal abundance occurred at the container rather than the household level. A key determinant of Ae. aegypti production was the frequent filling of the containers with water, which caused asynchronous hatching of Ae. aegypti eggs and development of cohorts of immatures. We calculated the probability of the water volume of a large container (>500 L) increasing or decreasing by ≥20% to be 0.05 and 0.07 per day, respectively, and for small containers (<500 L) to be 0.11 and 0.13 per day, respectively. These human water-management behaviors are important determinants of Ae. aegypti production during the dry season. This has implications for choosing a suitable Wolbachia strain for release as it appears that prolonged egg desiccation does not occur in this village.Jason A L JefferyArchie C A ClementsYen Thi NguyenLe Hoang NguyenSon Hai TranNghia Trung LeNam Sinh VuPeter A RyanBrian H KayPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 7, p e39067 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jason A L Jeffery Archie C A Clements Yen Thi Nguyen Le Hoang Nguyen Son Hai Tran Nghia Trung Le Nam Sinh Vu Peter A Ryan Brian H Kay Water level flux in household containers in Vietnam--a key determinant of Aedes aegypti population dynamics.
description	We examined changes in the abundance of immature Aedes aegypti at the household and water storage container level during the dry-season (June-July, 2008) in Tri Nguyen village, central Vietnam. We conducted quantitative immature mosquito surveys of 171 containers in the same 41 households, with replacement of samples, every two days during a 29-day period. We developed multi-level mixed effects regression models to investigate container and household variability in pupal abundance. The percentage of houses that were positive for I/II instars, III/IV instars and pupae during any one survey ranged from 19.5-43.9%, 48.8-75.6% and 17.1-53.7%, respectively. The mean numbers of Ae. aegypti pupae per house ranged between 1.9-12.6 over the study period. Estimates of absolute pupal abundance were highly variable over the 29-day period despite relatively stable weather conditions. Most variability in pupal abundance occurred at the container rather than the household level. A key determinant of Ae. aegypti production was the frequent filling of the containers with water, which caused asynchronous hatching of Ae. aegypti eggs and development of cohorts of immatures. We calculated the probability of the water volume of a large container (>500 L) increasing or decreasing by ≥20% to be 0.05 and 0.07 per day, respectively, and for small containers (<500 L) to be 0.11 and 0.13 per day, respectively. These human water-management behaviors are important determinants of Ae. aegypti production during the dry season. This has implications for choosing a suitable Wolbachia strain for release as it appears that prolonged egg desiccation does not occur in this village.
format	article
author	Jason A L Jeffery Archie C A Clements Yen Thi Nguyen Le Hoang Nguyen Son Hai Tran Nghia Trung Le Nam Sinh Vu Peter A Ryan Brian H Kay
author_facet	Jason A L Jeffery Archie C A Clements Yen Thi Nguyen Le Hoang Nguyen Son Hai Tran Nghia Trung Le Nam Sinh Vu Peter A Ryan Brian H Kay
author_sort	Jason A L Jeffery
title	Water level flux in household containers in Vietnam--a key determinant of Aedes aegypti population dynamics.
title_short	Water level flux in household containers in Vietnam--a key determinant of Aedes aegypti population dynamics.
title_full	Water level flux in household containers in Vietnam--a key determinant of Aedes aegypti population dynamics.
title_fullStr	Water level flux in household containers in Vietnam--a key determinant of Aedes aegypti population dynamics.
title_full_unstemmed	Water level flux in household containers in Vietnam--a key determinant of Aedes aegypti population dynamics.
title_sort	water level flux in household containers in vietnam--a key determinant of aedes aegypti population dynamics.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/f20f21f3969d49a8be5dcb1831c2f5ce
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Water level flux in household containers in Vietnam--a key determinant of Aedes aegypti population dynamics.

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