Smallest Anopheles farauti occur during the peak transmission season in the Solomon Islands.
Anopheles farauti
Anopheles hinesorum
Anopheles lungae
Density-dependence
Size variation
Solomon Islands
Wing length
Journal
Malaria journal
ISSN: 1475-2875
Titre abrégé: Malar J
Pays: England
ID NLM: 101139802
Informations de publication
Date de publication:
24 Jun 2019
24 Jun 2019
Historique:
received:
16
04
2019
accepted:
18
06
2019
entrez:
26
6
2019
pubmed:
27
6
2019
medline:
8
10
2019
Statut:
epublish
Résumé
Malaria transmission varies in intensity amongst Solomon Island villages where Anopheles farauti is the only vector. This variation in transmission intensity might be explained by density-dependent processes during An. farauti larval development, as density dependence can impact adult size with associated fitness costs and daily survivorship. Adult anophelines were sampled from six villages in Western and Central Provinces, Solomon Islands between March 2014 and February 2017. The size of females was estimated by measuring wing lengths, and then analysed for associations with biting densities and rainfall. In the Solomon Islands, three anopheline species, An. farauti, Anopheles hinesorum and Anopheles lungae, differed in size. The primary malaria vector, An. farauti, varied significantly in size among villages. Greater rainfall was directly associated with higher densities of An. farauti biting rates, but inversely associated with body size with the smallest mean sized mosquitoes present during the peak transmission period. A measurable association between body size and survivorship was not found. Density dependent effects are likely impacting the size of adult An. farauti emerging from a range of larval habitats. The data suggest that rainfall increases An. farauti numbers and that these more abundant mosquitoes are significantly smaller in size, but without any reduced survivorship being associated with smaller size. The higher malaria transmission rate in a high malaria focus village appears to be determined more by vector numbers than size or survivorship of the vectors.
Sections du résumé
BACKGROUND
BACKGROUND
Malaria transmission varies in intensity amongst Solomon Island villages where Anopheles farauti is the only vector. This variation in transmission intensity might be explained by density-dependent processes during An. farauti larval development, as density dependence can impact adult size with associated fitness costs and daily survivorship.
METHODS
METHODS
Adult anophelines were sampled from six villages in Western and Central Provinces, Solomon Islands between March 2014 and February 2017. The size of females was estimated by measuring wing lengths, and then analysed for associations with biting densities and rainfall.
RESULTS
RESULTS
In the Solomon Islands, three anopheline species, An. farauti, Anopheles hinesorum and Anopheles lungae, differed in size. The primary malaria vector, An. farauti, varied significantly in size among villages. Greater rainfall was directly associated with higher densities of An. farauti biting rates, but inversely associated with body size with the smallest mean sized mosquitoes present during the peak transmission period. A measurable association between body size and survivorship was not found.
CONCLUSIONS
CONCLUSIONS
Density dependent effects are likely impacting the size of adult An. farauti emerging from a range of larval habitats. The data suggest that rainfall increases An. farauti numbers and that these more abundant mosquitoes are significantly smaller in size, but without any reduced survivorship being associated with smaller size. The higher malaria transmission rate in a high malaria focus village appears to be determined more by vector numbers than size or survivorship of the vectors.
Identifiants
pubmed: 31234876
doi: 10.1186/s12936-019-2847-2
pii: 10.1186/s12936-019-2847-2
pmc: PMC6591980
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
208Subventions
Organisme : Bill and Melinda Gates Foundation
ID : 45114
Organisme : National Institute of Allergy and Infectious Diseases
ID : U19AI08986
Références
J Vector Ecol. 2000 Dec;25(2):212-7
pubmed: 11217219
J Med Entomol. 2002 Jan;39(1):162-72
pubmed: 11931252
J Am Mosq Control Assoc. 2002 Jun;18(2):100-6
pubmed: 12083350
J Med Entomol. 2002 Jul;39(4):699-704
pubmed: 12144308
Parasitol Today. 1988 Apr;4(4):91-7
pubmed: 15463054
Parasitology. 1992 Apr;104 ( Pt 2):233-7
pubmed: 1594289
Science. 2005 Jul 22;309(5734):607-10
pubmed: 16040705
Ecology. 2006 Jun;87(6):1445-51
pubmed: 16869419
Ecol Appl. 2008 Dec;18(8):2028-40
pubmed: 19263895
Trends Parasitol. 2010 Mar;26(3):130-6
pubmed: 20056485
PLoS Med. 2010 Aug 03;7(8):e1000303
pubmed: 20689800
Malar J. 2010 Nov 04;9:311
pubmed: 21050427
Proc Biol Sci. 2011 Oct 22;278(1721):3142-51
pubmed: 21389034
Parasit Vectors. 2011 Jul 28;4:153
pubmed: 21798055
Malar J. 2011 Sep 13;10:262
pubmed: 21910907
J Med Entomol. 1990 Sep;27(5):839-50
pubmed: 2231621
Malar J. 2013 Feb 07;12:56
pubmed: 23388506
Cochrane Database Syst Rev. 2013 Aug 29;(8):CD008923
pubmed: 23986463
Parasit Vectors. 2014 Dec 14;7:593
pubmed: 25496502
PLoS Negl Trop Dis. 2015 May 21;9(5):e0003758
pubmed: 25996619
Nature. 2015 Oct 8;526(7572):207-211
pubmed: 26375008
Trans R Soc Trop Med Hyg. 2016 Feb;110(2):107-17
pubmed: 26822603
Malar J. 2016 Mar 10;15:156
pubmed: 26969430
Malar J. 2016 Mar 15;15:164
pubmed: 26980326
Malar J. 2016 Apr 19;15:225
pubmed: 27093890
Malar J. 2016 Jul 15;15:364
pubmed: 27421769
Malar J. 2017 Nov 21;16(1):472
pubmed: 29162098
Lancet. 2017 Dec 9;390(10112):2532-2534
pubmed: 29195688
Evol Appl. 2017 Nov 06;11(4):415-430
pubmed: 29636796
Parasit Vectors. 2018 Nov 27;11(1):606
pubmed: 30482239
J Am Mosq Control Assoc. 1988 Jun;4(2):121-8
pubmed: 3193107
Am J Trop Med Hyg. 1995 Nov;53(5):478-81
pubmed: 7485705
Med Vet Entomol. 1993 Oct;7(4):328-32
pubmed: 8268486
Med Vet Entomol. 1996 Apr;10(2):170-2
pubmed: 8744710