MOSQUITO LARVAL HABITATS IN A SEMIARID ECOSYSTEM IN ERITREA: IMPACT OF LARVAL HABITAT MANAGEMENT ON ANOPHELES ARABIENSIS POPULATION

JOSEPHAT SHILILU International Centre of Insect Physiology and Ecology (ICIPE), Nairobi, Kenya; Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya; Kenya Medical Research Institute (KEMRI), Center for Geographic Medicine Research, Kilifi, Kenya; National Malaria Control Program, Ministry of Health, Asmara, Eritrea; Illinois Natural History Survey, University of Illinois, Champaign, Illinois

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CHARLES MBOGO International Centre of Insect Physiology and Ecology (ICIPE), Nairobi, Kenya; Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya; Kenya Medical Research Institute (KEMRI), Center for Geographic Medicine Research, Kilifi, Kenya; National Malaria Control Program, Ministry of Health, Asmara, Eritrea; Illinois Natural History Survey, University of Illinois, Champaign, Illinois

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TEWOLDE GHEBREMESKEL International Centre of Insect Physiology and Ecology (ICIPE), Nairobi, Kenya; Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya; Kenya Medical Research Institute (KEMRI), Center for Geographic Medicine Research, Kilifi, Kenya; National Malaria Control Program, Ministry of Health, Asmara, Eritrea; Illinois Natural History Survey, University of Illinois, Champaign, Illinois

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JOHN GITHURE International Centre of Insect Physiology and Ecology (ICIPE), Nairobi, Kenya; Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya; Kenya Medical Research Institute (KEMRI), Center for Geographic Medicine Research, Kilifi, Kenya; National Malaria Control Program, Ministry of Health, Asmara, Eritrea; Illinois Natural History Survey, University of Illinois, Champaign, Illinois

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ROBERT NOVAK International Centre of Insect Physiology and Ecology (ICIPE), Nairobi, Kenya; Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya; Kenya Medical Research Institute (KEMRI), Center for Geographic Medicine Research, Kilifi, Kenya; National Malaria Control Program, Ministry of Health, Asmara, Eritrea; Illinois Natural History Survey, University of Illinois, Champaign, Illinois

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This study investigated the impact of larval management and the temporal variation in larval productivity in Eritrea, a semiarid ecosystem. Results of this study show that mosquito breeding persists throughout the year mainly in stream bed pools. Anopheles arabiensis production in the ephemeral natural aquatic habitats such the streambed pools was high throughout the year and negatively associated with rainfall (r = −0.288, P = 0.047). High densities of An. arabiensis larvae were also recorded from canals and drainage channels at wells and communal water supply points. The numerous water supply locations and wells help sustain malaria transmission by serving as sources of anophelines where people aggregate. There was a strong association between larval production and adult emergent densities (r = 0.365, P = 0.011). The results of this study further show that implementation of larval control strategies in the study villages significantly reduced vector productivity as measured by both larval (F = 24.919, df = 1,178, P < 0.001) and adult An. arabiensis densities (F = 3.052, df = 1,119, P = 0.014) in the treated sites over the 24-month study period. The results of this semiarid larval management model suggests that 1) larval management backed by habitat identification, mapping, and surveillance is a feasible tactic for managing malaria vectors, 2) a special focus in such semiarid ecosystems should be targeted to the highly productive larval habitats along stream beds and others of periodic importance derived from human activities, and 3) public information and sensitization of communities to participate in controlling the pre-adult stages of anopheline mosquitoes is central for success.

Author Notes

Reprint requests: Josephat Shililu, International Centre of Insect Physiology and Ecology (ICIPE), PO Box 30772-00100, Nairobi, Kenya. Email: jshililu@icipe.org.
  • 1

    Lindblade KA, Walker ED, Onapa AW, Katungu J, Wilson ML, 2000. Land use change alters malaria transmission parameters by modifying temperature in a highland area of Uganda. Trop Med Int Health 5 :263–274.

    • PubMed
    • Search Google Scholar
    • Export Citation
  • 2

    Chima RI, Goodman CA, Mills A, 2003. The economic impact of malaria in Africa: A critical review of the evidence. Health Policy (New York) 63 :17–36.

  • 3

    Lindsay SW, Martens WJ, 1998. Malaria in the African highlands: Past, present and future. Bull World Health Org 76 :325–332.

  • 4

    World Health Organization/United Nations Children’s Fund (UNICEF), 2003. The Africa Malaria Report 2003. Geneva: World Health Organization.

    • PubMed
    • Export Citation
  • 5

    Manga L, Abdoulaye T, Shililu J, 2004. Implementation of integrated vector management in the WHO-Africa region: Progress report 2000–2003. Joint collaboration between the Vector Biology and Control Unit, Division of Prevention and Control of Communicable Diseases, WHO Regional Office for Africa and Environmental Health Project of USAID. Available at http://www.ehproject.org/pdf/Joint_Publications. Accessed August 2004.

    • PubMed
    • Export Citation
  • 6

    Shililu J, Tewolde GM, Mengistu S, Fekadu H, Mehari Z, Mbogo C, Githure J, Weidong G, Novak R, Beier JC, 2003. Distribution of anopheline mosquitoes in Eritrea. Am J Trop Med Hyg 69 :259–302.

    • PubMed
    • Search Google Scholar
    • Export Citation
  • 7

    Sintasath DM, Tewolde GM, Lynch M, Kleinau E, Gustavo B, Shililu J, Brantly E, Graves PM, Beier JC, 2005. Malaria prevalence and associated risk factors in Eritrea. Am J Trop Med Hyg 72 :682–687.

    • PubMed
    • Search Google Scholar
    • Export Citation
  • 8

    Barat L, 2006. Four success stories: How malaria burden was successfully reduced in Brazil, Eritrea, India and Vietnam. Am J Trop Med Hyg 74 :12–16.

  • 9

    Shililu J, Tewolde GM, Fessahaye S, Mengistu S, Fekadu H, Mehari Z, Asmelash GE, Sintasath D, Gustavo B, Mbogo C, Githure J, Brantly E, Novak R, Beier JC, 2003. Larval habitat diversity and ecology of anopheline larvae in Eritrea. J Med Entomol 40 :921–929.

    • PubMed
    • Search Google Scholar
    • Export Citation
  • 10

    Shililu J, Tewolde GM, Brantly E, Githure J, Mbogo CM, Beier JC, Fusco R, Novak RJ, 2003. Efficacy of Bacillus thuringiensis, Bacillus sphaericus and temephos for managing Anopheles larvae in Eritrea. J Am Mos Control Assoc 19 :251–258.

    • PubMed
    • Search Google Scholar
    • Export Citation
  • 11

    Grillet ME, 2000. Factors associated with the distribution of Anopheles aquasalis and An. oswaldoi (Diptera: Culicidae) in a malarious area, northeastern Venezuela. J Med Entomol 37 :231–238.

    • PubMed
    • Search Google Scholar
    • Export Citation
  • 12

    Gimnig JE, Ombok M, Otieno S, Kaufman MG, Vulule JM, Walker ED, 2002. Density-dependent development of Anopheles gambiae (Diptera: Culicidae) larvae in artificial habitats. J Med Entomol 39 :162–167.

    • PubMed
    • Search Google Scholar
    • Export Citation
  • 13

    Coluzzi M, Sabatini A, Petrarca V, Di Deco MA, 1979. Chromosomal differentiation and adaptation to human environment in the Anopheles gambiae complex. Trans R Soc Trop Med Hyg 37 :483–497.

    • PubMed
    • Search Google Scholar
    • Export Citation
  • 14

    Toure YT, Petrarca V, Traore SF, Coulibaly A, Maiga HM, Sankare O, Sow M, Di Deco MA, Coluzzi M, 1998. The distribution and inversion polymorphism of chromosomally recognized taxa of Anopheles gambiae complex in Mali, West Africa. Parasitologia 40 :477–511.

    • PubMed
    • Search Google Scholar
    • Export Citation
  • 15

    Robert VE, Awono-Ambene HP, Thiolouse J, 1998. Ecology of larval mosquitoes with reference to Anopheles arabiensis (Diptera: Culicidae) in a market garden wells in urban Dakar, Senegal. J Med Entomol 35 :948–955.

    • PubMed
    • Search Google Scholar
    • Export Citation
  • 16

    Gimnig JE, Ombok M, Kamau L, Hawley WA, 2001. Characteristics of larval anopheline (Diptera: Culicidae) habitats in Western Kenya. J Med Entomol 38 :282–288.

  • 17

    White GB, Rosen P, 1973. Comparative studies on sibling species of the Anopheles gambiae Giles complex (Diptera: Culicidae). II. Ecology of species A and B in savanna around Kaduna, Nigeria, during transition from wet to dry season. Bull Entomol Res 62 :613–625.

    • PubMed
    • Search Google Scholar
    • Export Citation
  • 18

    Charlwood JD, Billingsley PF, 2000. Dry season refugia of malaria-transmitting mosquitoes in a dry savannah of East Africa. Am J Trop Med Hyg 62 :726–732.

  • 19

    Kitron U, Spielman A, 1989. Suppression of transmission of malaria through source reduction: anti-anopheline measures applied in Israel, the United States and Italy. Rev Infect Dis 11 :391–406.

    • PubMed
    • Search Google Scholar
    • Export Citation
  • 20

    Killeen G, Fillinger U, Kiche I, Gouagna L, Knols B, 2002. Eradication of Anopheles gambiae from Brazil: Lessons for malaria control in Africa. Lancet Infect Dis 2 :618–627.

    • PubMed
    • Search Google Scholar
    • Export Citation
  • 21

    Gilles HM, Warrel DA, 1993. Bruce-Chwatt’s Essential Malariology, 3rd ed. London: Edward Arnold.

    • PubMed
    • Export Citation
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