Seasonal relationship between normalized difference vegetation index and abundance of the Phlebotomus kala-azar vector in an endemic focus in Bihar, India

  • Gouri S. Bhunia Department of Vector Biology and Control, Rajendra Memorial Research Institute of Medical Sciences, Agamkuan, Bihar, India.
  • Shreekant Kesari Department of Vector Biology and Control, Rajendra Memorial Research Institute of Medical Sciences, Agamkuan, Bihar, India.
  • Nandini Chatterjee 2Department of Geography, Presidency University, Kolkata, West Bengal, India.
  • Rakesh Mandal Department of Vector Biology and Control, Rajendra Memorial Research Institute of Medical Sciences, Agamkuan, Bihar, India.
  • Vijay Kumar Department of Vector Biology and Control, Rajendra Memorial Research Institute of Medical Sciences, Agamkuan, Bihar, India.
  • Pradeep Das | dr.pradeep.das@gmail.com Department of Vector Biology and Control, Rajendra Memorial Research Institute of Medical Sciences, Agamkuan, Bihar, India.

Abstract

Remote sensing was applied for the collection of spatio-temporal data to increase our understanding of the potential distribution of the kala-azar vector Phlebotomus argentipes in endemic areas of the Vaishali district of Bihar, India. We produced monthly distribution maps of the normalized difference vegetation index (NDVI) based on data from the thematic mapper (TM) sensor onboard the Landsat-5 satellite. Minimum, maximum and mean NDVI values were computed for each month and compared with the concurrent incidence of kala-azar and the vector density. Maximum and mean NDVI values (R2 = 0.55 and R2 = 0.60, respectively), as well as the season likelihood ratio (X2 = 17.51; P <0.001), were found to be strongly associated with kala-azar, while the correlation with between minimum NDVI values and kala-azar was weak (R2 = 0.25). Additionally, a strong association was found between the mean and maximum NDVI values with seasonal vector abundance (R2 = 0.60 and R2 = 0.55, respectively) but there was only a marginal association between minimum NDVI value and the spatial distribution of kala-azar vis-à-vis P. argentipes density.

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Published
2012-11-01
Section
Original Articles
Keywords:
remote sensing, Phlebotomus argentipes, normalized difference vegetation index, Kala-azar, India.
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How to Cite
Bhunia, G. S., Kesari, S., Chatterjee, N., Mandal, R., Kumar, V., & Das, P. (2012). Seasonal relationship between normalized difference vegetation index and abundance of the Phlebotomus kala-azar vector in an endemic focus in Bihar, India. Geospatial Health, 7(1), 51-62. https://doi.org/10.4081/gh.2012.104