Larval ecology of mosquitoes in sylvatic arbovirus foci in southeastern Senegal

Diawo Diallo, Cheikh T. Diagne, Kathryn A. Hanley, Amadou A. Sall, Michaela Buenemann, Yamar Ba, Ibrahima Dia, Scott Weaver, Mawlouth Diallo

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Background: Although adult mosquito vectors of sylvatic arbovirus [yellow fever (YFV), dengue-2 (DENV-2) and chikungunya (CHIKV)] have been studied for the past 40 years in southeastern Senegal, data are still lacking on the ecology of larval mosquitoes in this area. In this study, we investigated the larval habitats of mosquitoes and characterized their seasonal and spatial dynamics in arbovirus foci. Methods: We searched for wet microhabitats, classified in 9 categories, in five land cover classes (agriculture, forest, savannah, barren and village) from June, 2010 to January, 2011. Mosquito immatures were sampled monthly in up to 30 microhabitats of each category per land cover and bred until adult stage for determination. Results: No wet microhabitats were found in the agricultural sites; in the remaining land covers immature stages of 35 mosquito species in 7 genera were sampled from 9 microhabitats (tree holes, fresh fruit husks, decaying fruit husks, puddles, bamboo holes, discarded containers, tires, rock holes and storage containers). The most abundant species was Aedes aegypti formosus, representing 30.2% of the collections, followed by 12 species, representing each more than 1% of the total, among them the arbovirus vectors Ae. vittatus (7.9%), Ae. luteocephalus (5.7%), Ae. taylori (5.0%), and Ae. furcifer (1.3%). Aedes aegypti, Cx. nebulosus, Cx. perfuscus, Cx. tritaeniorhynchus, Er. chrysogster and Ae. vittatus were the only common species collected from all land covers. Aedes furcifer and Ae. taylori were collected in fresh fruit husks and tree holes. Species richness and dominance varied significantly in land covers and microhabitats. Positive associations were found mainly between Ae. furcifer, Ae. taylori and Ae. luteocephalus. A high proportion of potential enzootic vectors that are not anthropophilic were found in the larval mosquito fauna. Conclusions: In southeastern Senegal, Ae. furcifer and Ae. taylori larvae showed a more limited distribution among both land cover and microhabitat types than the other common species. Uniquely among vector species, Ae. aegypti formosus larvae occurred at the highest frequency in villages. Finally, a high proportion of the potential non-anthropophilic vectors were represented in the larval mosquito fauna, suggesting the existence of unidentified sylvatic arbovirus cycles in southeastern Senegal.

Original languageEnglish (US)
Article number286
JournalParasites and Vectors
Volume5
Issue number1
DOIs
StatePublished - 2012

Fingerprint

Arboviruses
Senegal
Ecology
Culicidae
Aedes
Fruit
Larva
Yellow Fever
Dengue
Agriculture
Ecosystem

Keywords

  • Aedes aegypti formosus
  • Aedes furcifer
  • Aedes taylori
  • Land covers
  • Microhabitats
  • Mosquito larvae
  • Southeastern Senegal
  • Species association
  • Sylvatic arbovirus vectors

ASJC Scopus subject areas

  • Parasitology
  • Infectious Diseases

Cite this

Diallo, D., Diagne, C. T., Hanley, K. A., Sall, A. A., Buenemann, M., Ba, Y., ... Diallo, M. (2012). Larval ecology of mosquitoes in sylvatic arbovirus foci in southeastern Senegal. Parasites and Vectors, 5(1), [286]. https://doi.org/10.1186/1756-3305-5-286

Larval ecology of mosquitoes in sylvatic arbovirus foci in southeastern Senegal. / Diallo, Diawo; Diagne, Cheikh T.; Hanley, Kathryn A.; Sall, Amadou A.; Buenemann, Michaela; Ba, Yamar; Dia, Ibrahima; Weaver, Scott; Diallo, Mawlouth.

In: Parasites and Vectors, Vol. 5, No. 1, 286, 2012.

Research output: Contribution to journalArticle

Diallo, D, Diagne, CT, Hanley, KA, Sall, AA, Buenemann, M, Ba, Y, Dia, I, Weaver, S & Diallo, M 2012, 'Larval ecology of mosquitoes in sylvatic arbovirus foci in southeastern Senegal', Parasites and Vectors, vol. 5, no. 1, 286. https://doi.org/10.1186/1756-3305-5-286
Diallo, Diawo ; Diagne, Cheikh T. ; Hanley, Kathryn A. ; Sall, Amadou A. ; Buenemann, Michaela ; Ba, Yamar ; Dia, Ibrahima ; Weaver, Scott ; Diallo, Mawlouth. / Larval ecology of mosquitoes in sylvatic arbovirus foci in southeastern Senegal. In: Parasites and Vectors. 2012 ; Vol. 5, No. 1.
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AU - Diallo, Diawo

AU - Diagne, Cheikh T.

AU - Hanley, Kathryn A.

AU - Sall, Amadou A.

AU - Buenemann, Michaela

AU - Ba, Yamar

AU - Dia, Ibrahima

AU - Weaver, Scott

AU - Diallo, Mawlouth

PY - 2012

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N2 - Background: Although adult mosquito vectors of sylvatic arbovirus [yellow fever (YFV), dengue-2 (DENV-2) and chikungunya (CHIKV)] have been studied for the past 40 years in southeastern Senegal, data are still lacking on the ecology of larval mosquitoes in this area. In this study, we investigated the larval habitats of mosquitoes and characterized their seasonal and spatial dynamics in arbovirus foci. Methods: We searched for wet microhabitats, classified in 9 categories, in five land cover classes (agriculture, forest, savannah, barren and village) from June, 2010 to January, 2011. Mosquito immatures were sampled monthly in up to 30 microhabitats of each category per land cover and bred until adult stage for determination. Results: No wet microhabitats were found in the agricultural sites; in the remaining land covers immature stages of 35 mosquito species in 7 genera were sampled from 9 microhabitats (tree holes, fresh fruit husks, decaying fruit husks, puddles, bamboo holes, discarded containers, tires, rock holes and storage containers). The most abundant species was Aedes aegypti formosus, representing 30.2% of the collections, followed by 12 species, representing each more than 1% of the total, among them the arbovirus vectors Ae. vittatus (7.9%), Ae. luteocephalus (5.7%), Ae. taylori (5.0%), and Ae. furcifer (1.3%). Aedes aegypti, Cx. nebulosus, Cx. perfuscus, Cx. tritaeniorhynchus, Er. chrysogster and Ae. vittatus were the only common species collected from all land covers. Aedes furcifer and Ae. taylori were collected in fresh fruit husks and tree holes. Species richness and dominance varied significantly in land covers and microhabitats. Positive associations were found mainly between Ae. furcifer, Ae. taylori and Ae. luteocephalus. A high proportion of potential enzootic vectors that are not anthropophilic were found in the larval mosquito fauna. Conclusions: In southeastern Senegal, Ae. furcifer and Ae. taylori larvae showed a more limited distribution among both land cover and microhabitat types than the other common species. Uniquely among vector species, Ae. aegypti formosus larvae occurred at the highest frequency in villages. Finally, a high proportion of the potential non-anthropophilic vectors were represented in the larval mosquito fauna, suggesting the existence of unidentified sylvatic arbovirus cycles in southeastern Senegal.

AB - Background: Although adult mosquito vectors of sylvatic arbovirus [yellow fever (YFV), dengue-2 (DENV-2) and chikungunya (CHIKV)] have been studied for the past 40 years in southeastern Senegal, data are still lacking on the ecology of larval mosquitoes in this area. In this study, we investigated the larval habitats of mosquitoes and characterized their seasonal and spatial dynamics in arbovirus foci. Methods: We searched for wet microhabitats, classified in 9 categories, in five land cover classes (agriculture, forest, savannah, barren and village) from June, 2010 to January, 2011. Mosquito immatures were sampled monthly in up to 30 microhabitats of each category per land cover and bred until adult stage for determination. Results: No wet microhabitats were found in the agricultural sites; in the remaining land covers immature stages of 35 mosquito species in 7 genera were sampled from 9 microhabitats (tree holes, fresh fruit husks, decaying fruit husks, puddles, bamboo holes, discarded containers, tires, rock holes and storage containers). The most abundant species was Aedes aegypti formosus, representing 30.2% of the collections, followed by 12 species, representing each more than 1% of the total, among them the arbovirus vectors Ae. vittatus (7.9%), Ae. luteocephalus (5.7%), Ae. taylori (5.0%), and Ae. furcifer (1.3%). Aedes aegypti, Cx. nebulosus, Cx. perfuscus, Cx. tritaeniorhynchus, Er. chrysogster and Ae. vittatus were the only common species collected from all land covers. Aedes furcifer and Ae. taylori were collected in fresh fruit husks and tree holes. Species richness and dominance varied significantly in land covers and microhabitats. Positive associations were found mainly between Ae. furcifer, Ae. taylori and Ae. luteocephalus. A high proportion of potential enzootic vectors that are not anthropophilic were found in the larval mosquito fauna. Conclusions: In southeastern Senegal, Ae. furcifer and Ae. taylori larvae showed a more limited distribution among both land cover and microhabitat types than the other common species. Uniquely among vector species, Ae. aegypti formosus larvae occurred at the highest frequency in villages. Finally, a high proportion of the potential non-anthropophilic vectors were represented in the larval mosquito fauna, suggesting the existence of unidentified sylvatic arbovirus cycles in southeastern Senegal.

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KW - Aedes furcifer

KW - Aedes taylori

KW - Land covers

KW - Microhabitats

KW - Mosquito larvae

KW - Southeastern Senegal

KW - Species association

KW - Sylvatic arbovirus vectors

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