Effect of irrigation systems on temporal distribution of malaria vectors in semi-arid regions

Shunji Ohta, Takumi Kaga

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Previous research models have used climate data to explain habitat conditions of Anopheles mosquitoes transmitting malaria parasites. Although they can estimate mosquito populations with sufficient accuracy in many areas, observational data show that there is a tendency to underestimate the active growth and reproduction period of mosquitoes in semi-arid agricultural regions. In this study, a new, modified model that includes irrigation as a factor was developed to predict the active growing period of mosquitoes more precisely than the base model for ecophysiological and climatological distribution of mosquito generations (ECD-mg). Five sites with complete sets of observational data were selected in semi-arid regions of India for the comparison. The active growing period of mosquitoes determined from the modified ECD-mg model that incorporated the irrigation factor was in agreement with the observational data, whereas the active growing period was underestimated by the previous ECD-mg model that did not incorporate irrigation. This suggests that anthropogenic changes in the water supply due to extensive irrigation can encourage the growth of Anopheles mosquitoes through the alteration of the natural water balance in their habitat. In addition, it was found that the irrigation systems not only enable the active growth of mosquitoes in dry seasons but also play an important role in stabilizing the growth in rainy seasons. Consequently, the irrigation systems could lengthen the annual growing period of Anopheles mosquitoes and increase the maximum generation number of mosquitoes in semi-arid subtropical regions.

    Original languageEnglish
    Pages (from-to)349-359
    Number of pages11
    JournalInternational Journal of Biometeorology
    Volume58
    Issue number3
    DOIs
    Publication statusPublished - 2014

    Fingerprint

    malaria
    irrigation system
    Culicidae
    mosquito
    semiarid region
    temporal distribution
    Malaria
    Anopheles
    irrigation
    Growth
    Ecosystem
    effect
    subtropical region
    Water Supply
    habitat
    Climate
    Reproduction
    dry season
    water budget
    India

    Keywords

    • Anopheles
    • Growing period
    • Growth model
    • Irrigation
    • Water balance

    ASJC Scopus subject areas

    • Atmospheric Science
    • Ecology
    • Health, Toxicology and Mutagenesis

    Cite this

    Effect of irrigation systems on temporal distribution of malaria vectors in semi-arid regions. / Ohta, Shunji; Kaga, Takumi.

    In: International Journal of Biometeorology, Vol. 58, No. 3, 2014, p. 349-359.

    Research output: Contribution to journalArticle

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