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Can water-level management reduce malaria mosquito abundance around large dams in sub-Saharan Africa?

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  • Solomon Kibret
  • G Glenn Wilson
  • Darren Ryder
  • Habte Tekie
  • Beyene Petros

Abstract

Background: Water level management has been suggested as a potential tool to reduce malaria around large reservoirs. However, no field-based test has been conducted to assess the effect of water level management on mosquito larval abundance in African settings. The objective of the present study is to evaluate the effects of water level drawdown rates on mosquito larval abundance. Methods: Twelve experimental dams were constructed on the foreshore of the Koka Dam in Ethiopia. These were grouped into four daily water drawdown treatments, each with three replicates: no water-level drawdown (Group 1; Control), 10 mm.d-1 (Group 2), 15 mm.d-1 (Group 3) and 20 mm.d-1 (Group 4). Larval sampling was conducted weekly for a period of 6 weeks each in the main malaria transmission season (October to November 2013) and subsequent dry season (February to March 2014). Larval densities were compared among treatments over time using repeated measures Analysis of Variance (ANOVA). Results: A total of 284 Anopheles mosquito larvae were collected from the experimental dams during the study period. Most (63.4%; n = 180) were collected during the main malaria transmission season while the remaining (36.6%; n = 104) were collected during the dry season. Larvae comprised four Anopheles species, dominated by Anopheles arabiensis (48.1% of total larval samples; n = 136) and An. pharoensis (33.2%; n = 94). Mean larval density was highest in control treatment dams with stable water levels throughout the study, and decreased significantly (P

Suggested Citation

  • Solomon Kibret & G Glenn Wilson & Darren Ryder & Habte Tekie & Beyene Petros, 2018. "Can water-level management reduce malaria mosquito abundance around large dams in sub-Saharan Africa?," PLOS ONE, Public Library of Science, vol. 13(4), pages 1-12, April.
    • Handle: RePEc:plo:pone00:0196064
    DOI: 10.1371/journal.pone.0196064
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    References listed on IDEAS

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    1. Jurg Utzinger & Yesim Tozan & Burton H. Singer, 2001. "Efficacy and cost-effectiveness of environmental management for malaria control," Working Papers 266, Princeton University, Woodrow Wilson School of Public and International Affairs, Center for Health and Wellbeing..
    2. Kibret, S. & McCartney, Matthew & Lautze, Jonathan & Jayasinghe, G., 2009. "Malaria transmission in the vicinity of impounded water: evidence from the Koka Reservoir, Ethiopia," IWMI Research Reports H042338, International Water Management Institute.
    3. repec:pri:cheawb:malaria is not listed on IDEAS
    4. repec:pri:cheawb:malaria.pdf is not listed on IDEAS
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    1. Andrea J. Lund & David Lopez-Carr & Susanne H. Sokolow & Jason R. Rohr & Giulio A. De Leo, 2021. "Agricultural Innovations to Reduce the Health Impacts of Dams," Sustainability, MDPI, vol. 13(4), pages 1-8, February.

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