Dataset describing the biting profile, seasonality and feeding cycle of Anopheles farauti in Haleta village, Solomon Islands

Background: The effectiveness of vector control on malaria transmission by long lasting insecticidal nets (LLINs) and indoor residual spraying (IRS) depends on the vectors entering houses to blood feed and rest when people are inside houses. In the Solomon Islands, significant reductions in malaria have been achieved in the past 20 years with insecticide treated bednets, IRS and improved diagnosis and treatment with artemisinin combination therapies; despite the preference of the primary vector, Anopheles farauti, to feed outdoors and early in the evening and thereby avoid potential exposure to insecticides. Rational development of tools to complement LLINs and IRS by attacking vectors outdoor requires detailed knowledge of the biology and behaviours of the target species.

Methods: Malaria transmission in Central Province, Solomon Islands was estimated by measuring the components comprising the entomological inoculation rate (EIR) as well as the vectorial capacity of An. farauti. In addition, the daily and seasonal biting behaviour of An. farauti, was examined and the duration of the feeding cycle was estimated with a mark-release-recapture experiment.

Results: Anopheles farauti was highly exophagic with 72% captured by human landing catches (HLC) outside of houses. Three-quarters (76%) of blood feeding on humans was estimated to occur before 21.00 h. When the hourly location of humans was considered, the proportion of exposure to mosquito bites on humans occurring indoors (πi) was only 0.130 ± 0.129. Peak densities of host seeking An. farauti occurred between October and January. The annual EIR was estimated to be 2.5 for 2012 and 33.2 for 2013. The length of the feeding cycle was 2.1 days.

Conclusions: The short duration of the feeding cycle by this species offers an explanation for the substantial control of malaria that has been achieved in the Solomon Islands by LLINs and IRS. Anopheles farauti is primarily exophagic and early biting,with 13% of mosquitoes entering houses to feed late at night during each feeding cycle. The 2 day feeding cycle of An. farauti requires females to take 5-6 blood meals before the extrinsic incubation period (EIP) is completed; and this could translate into substantial population-level mortality by LLINs or IRS before females would be infectious to humans with P. falciparum and P. vivax. Although An. farauti is primarily exophagic, the indoor vector control tools recommended by the World Health Organisation (LLINs and IRS) can still provide an important level of control. Nonetheless, elimination will likely require vector control tools that target other bionomic vulnerabilities to suppress transmission outdoors and that complement the control provided by LLINs and IRS.

    Data Record Details
    Data record related to this publication Dataset describing the biting profile, seasonality and feeding cycle of Anopheles farauti in Haleta village, Solomon Islands
    Data Publication title Dataset describing the biting profile, seasonality and feeding cycle of Anopheles farauti in Haleta village, Solomon Islands
  • Description

    Background: The effectiveness of vector control on malaria transmission by long lasting insecticidal nets (LLINs) and indoor residual spraying (IRS) depends on the vectors entering houses to blood feed and rest when people are inside houses. In the Solomon Islands, significant reductions in malaria have been achieved in the past 20 years with insecticide treated bednets, IRS and improved diagnosis and treatment with artemisinin combination therapies; despite the preference of the primary vector, Anopheles farauti, to feed outdoors and early in the evening and thereby avoid potential exposure to insecticides. Rational development of tools to complement LLINs and IRS by attacking vectors outdoor requires detailed knowledge of the biology and behaviours of the target species.

    Methods: Malaria transmission in Central Province, Solomon Islands was estimated by measuring the components comprising the entomological inoculation rate (EIR) as well as the vectorial capacity of An. farauti. In addition, the daily and seasonal biting behaviour of An. farauti, was examined and the duration of the feeding cycle was estimated with a mark-release-recapture experiment.

    Results: Anopheles farauti was highly exophagic with 72% captured by human landing catches (HLC) outside of houses. Three-quarters (76%) of blood feeding on humans was estimated to occur before 21.00 h. When the hourly location of humans was considered, the proportion of exposure to mosquito bites on humans occurring indoors (πi) was only 0.130 ± 0.129. Peak densities of host seeking An. farauti occurred between October and January. The annual EIR was estimated to be 2.5 for 2012 and 33.2 for 2013. The length of the feeding cycle was 2.1 days.

    Conclusions: The short duration of the feeding cycle by this species offers an explanation for the substantial control of malaria that has been achieved in the Solomon Islands by LLINs and IRS. Anopheles farauti is primarily exophagic and early biting,with 13% of mosquitoes entering houses to feed late at night during each feeding cycle. The 2 day feeding cycle of An. farauti requires females to take 5-6 blood meals before the extrinsic incubation period (EIP) is completed; and this could translate into substantial population-level mortality by LLINs or IRS before females would be infectious to humans with P. falciparum and P. vivax. Although An. farauti is primarily exophagic, the indoor vector control tools recommended by the World Health Organisation (LLINs and IRS) can still provide an important level of control. Nonetheless, elimination will likely require vector control tools that target other bionomic vulnerabilities to suppress transmission outdoors and that complement the control provided by LLINs and IRS.

  • Other Descriptors
    • Descriptor

      This dataset is available as a description of data archiving and data dictionaries in PDF format and a spreadsheet in MS Excel (.xlsx) and Open Document (.ods) formats.

    • Descriptor type Note
    • Descriptor

      This dataset was updated 14/08/2018. The sampling period was extended from a completion date of 21/02/2014 to 23/07/2017. 

    • Descriptor type Note
  • Data type dataset
  • Keywords
    • Anopheles farauti
    • Solomon Islands
    • bionomics
    • mark-release-recapture
    • feeding cycle
    • seasonality
    • biting profile
  • Funding source
  • Research grant(s)/Scheme name(s)
    • 19377 - Malaria Transmission Consortium Supplement
    • 20247 - Transmission (ICEMR)
  • Research themes
    Tropical Health, Medicine and Biosecurity
    FoR Codes (*)
    • 060207 - Population Ecology
    • 111799 - Public Health and Health Services not elsewhere classified
    SEO Codes
    • 960405 - Control of Pests, Diseases and Exotic Species at Regional or Larger Scales
    • 920499 - Public Health (excl. Specific Population Health) not elsewhere classified
    Specify spatial or temporal setting of the data
    Temporal (time) coverage
  • Start Date 2011/08/27
  • End Date 2017/07/23
  • Time Period
    Spatial (location) coverage
  • Locations
    • Nggela Sule Island, Solomon Islands
    • Haleta, Solomon Islands
  • Related publications
      Name Russell, Tanya L., Beebe, Nigel W., Bugoro, Hugo, Apairamo, Allan, Chow, Weng K., Cooper, Robert D., Collins, Frank H., Lobo, Neil F., and Burkot, Thomas R. (2016) Frequent blood feeding enables insecticide-treated nets to reduce transmission by mosquitoes that bite predominately outdoors. Malaria Journal, 15 (156). pp. 1-9.
    • URL http://dx.doi.org/10.1186/s12936-016-1195-8
    • Notes Open Access
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    The data will be licensed under CC BY: Attribution 3.0 AU
  • Other Licence
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  • Data owners
      James Cook University
    Citation Russell, Tanya; Burkot, Thomas; Beebe, N; Bugoro, H; Apairamo, A; Chow, W; Cooper, R; Collins, F; Lobo, N (2016): Dataset describing the biting profile, seasonality and feeding cycle of Anopheles farauti in Haleta village, Solomon Islands. James Cook University. https://doi.org/10.4225/28/56C671268CF73