The contribution of aestivating mosquitoes to the persistence of Anopheles gambiae in the Sahel
Abstract Background Persistence of African anophelines throughout the long dry season (4-8 months) when no surface waters are available remains one of the enduring mysteries of medical entomology. Recent studies demonstrated that aestivation (summer diapause) is one mechanism that allows the African...
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ftdoajarticles:oai:doaj.org/article:9e9ba4b584d748b3bf934e05b585e17a 2023-05-15T15:11:46+02:00 The contribution of aestivating mosquitoes to the persistence of Anopheles gambiae in the Sahel Traoré Sékou F Diallo Moussa Yaro Alpha Kassogué Yaya Timbine Seydou Dao Adama Adamou Abdoulaye Huestis Diana L Lehmann Tovi 2011-06-01T00:00:00Z https://doi.org/10.1186/1475-2875-10-151 https://doaj.org/article/9e9ba4b584d748b3bf934e05b585e17a EN eng BMC http://www.malariajournal.com/content/10/1/151 https://doaj.org/toc/1475-2875 doi:10.1186/1475-2875-10-151 1475-2875 https://doaj.org/article/9e9ba4b584d748b3bf934e05b585e17a Malaria Journal, Vol 10, Iss 1, p 151 (2011) Arctic medicine. Tropical medicine RC955-962 Infectious and parasitic diseases RC109-216 article 2011 ftdoajarticles https://doi.org/10.1186/1475-2875-10-151 2022-12-31T06:56:35Z Abstract Background Persistence of African anophelines throughout the long dry season (4-8 months) when no surface waters are available remains one of the enduring mysteries of medical entomology. Recent studies demonstrated that aestivation (summer diapause) is one mechanism that allows the African malaria mosquito, Anopheles gambiae , to persist in the Sahel. However, migration from distant localities - where reproduction continues year-round - might also be involved. Methods To assess the contribution of aestivating adults to the buildup of populations in the subsequent wet season, two villages subjected to weekly pyrethrum sprays throughout the dry season were compared with two nearby villages, which were only monitored. If aestivating adults are the main source of the subsequent wet-season population, then the subsequent wet-season density in the treated villages will be lower than in the control villages. Moreover, since virtually only M-form An. gambiae are found during the dry season, the reduction should be specific to the M form, whereas no such difference is predicted for S-form An. gambiae or Anopheles arabiensis . On the other hand, if migrants arriving with the first rain are the main source, no differences between treated and control villages are expected across all members of the An. gambiae complex. Results The wet-season density of the M form in treated villages was 30% lower than that in the control (P < 10 -4 , permutation test), whereas no significant differences were detected in the S form or An . arabiensis . Conclusions These results support the hypothesis that the M form persist in the arid Sahel primarily by aestivation, whereas the S form and An. arabiensis rely on migration from distant locations. Implications for malaria control are discussed. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Malaria Journal 10 1 151 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
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Arctic medicine. Tropical medicine RC955-962 Infectious and parasitic diseases RC109-216 |
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Arctic medicine. Tropical medicine RC955-962 Infectious and parasitic diseases RC109-216 Traoré Sékou F Diallo Moussa Yaro Alpha Kassogué Yaya Timbine Seydou Dao Adama Adamou Abdoulaye Huestis Diana L Lehmann Tovi The contribution of aestivating mosquitoes to the persistence of Anopheles gambiae in the Sahel |
topic_facet |
Arctic medicine. Tropical medicine RC955-962 Infectious and parasitic diseases RC109-216 |
description |
Abstract Background Persistence of African anophelines throughout the long dry season (4-8 months) when no surface waters are available remains one of the enduring mysteries of medical entomology. Recent studies demonstrated that aestivation (summer diapause) is one mechanism that allows the African malaria mosquito, Anopheles gambiae , to persist in the Sahel. However, migration from distant localities - where reproduction continues year-round - might also be involved. Methods To assess the contribution of aestivating adults to the buildup of populations in the subsequent wet season, two villages subjected to weekly pyrethrum sprays throughout the dry season were compared with two nearby villages, which were only monitored. If aestivating adults are the main source of the subsequent wet-season population, then the subsequent wet-season density in the treated villages will be lower than in the control villages. Moreover, since virtually only M-form An. gambiae are found during the dry season, the reduction should be specific to the M form, whereas no such difference is predicted for S-form An. gambiae or Anopheles arabiensis . On the other hand, if migrants arriving with the first rain are the main source, no differences between treated and control villages are expected across all members of the An. gambiae complex. Results The wet-season density of the M form in treated villages was 30% lower than that in the control (P < 10 -4 , permutation test), whereas no significant differences were detected in the S form or An . arabiensis . Conclusions These results support the hypothesis that the M form persist in the arid Sahel primarily by aestivation, whereas the S form and An. arabiensis rely on migration from distant locations. Implications for malaria control are discussed. |
format |
Article in Journal/Newspaper |
author |
Traoré Sékou F Diallo Moussa Yaro Alpha Kassogué Yaya Timbine Seydou Dao Adama Adamou Abdoulaye Huestis Diana L Lehmann Tovi |
author_facet |
Traoré Sékou F Diallo Moussa Yaro Alpha Kassogué Yaya Timbine Seydou Dao Adama Adamou Abdoulaye Huestis Diana L Lehmann Tovi |
author_sort |
Traoré Sékou F |
title |
The contribution of aestivating mosquitoes to the persistence of Anopheles gambiae in the Sahel |
title_short |
The contribution of aestivating mosquitoes to the persistence of Anopheles gambiae in the Sahel |
title_full |
The contribution of aestivating mosquitoes to the persistence of Anopheles gambiae in the Sahel |
title_fullStr |
The contribution of aestivating mosquitoes to the persistence of Anopheles gambiae in the Sahel |
title_full_unstemmed |
The contribution of aestivating mosquitoes to the persistence of Anopheles gambiae in the Sahel |
title_sort |
contribution of aestivating mosquitoes to the persistence of anopheles gambiae in the sahel |
publisher |
BMC |
publishDate |
2011 |
url |
https://doi.org/10.1186/1475-2875-10-151 https://doaj.org/article/9e9ba4b584d748b3bf934e05b585e17a |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Malaria Journal, Vol 10, Iss 1, p 151 (2011) |
op_relation |
http://www.malariajournal.com/content/10/1/151 https://doaj.org/toc/1475-2875 doi:10.1186/1475-2875-10-151 1475-2875 https://doaj.org/article/9e9ba4b584d748b3bf934e05b585e17a |
op_doi |
https://doi.org/10.1186/1475-2875-10-151 |
container_title |
Malaria Journal |
container_volume |
10 |
container_issue |
1 |
container_start_page |
151 |
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