A Preliminary Study to Forecast Japanese Encephalitis Vector Abundance in Paddy Growing Area, with the Aid of Radar Satellite Images
| Autor: | Purushothaman Jambulingam, Aladu Ramakrishnan Rajavel, Ramalingam Natarajan, Swaminathan Subramanian, K Hari Kishan Raju, Brij Kishore Tyagi, V. Thenmozhi, S. Sabesan |
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| Rok vydání: | 2016 |
| Předmět: |
Satellite Imagery
Irrigation 030231 tropical medicine Population Microbiology Crop 03 medical and health sciences 0302 clinical medicine Abundance (ecology) Virology Animals 030212 general & internal medicine Encephalitis Japanese education Ecosystem Encephalitis Virus Japanese education.field_of_study Radar biology Ecology Agriculture Oryza biology.organism_classification Culex tritaeniorhynchus Insect Vectors Transplantation Culex Infectious Diseases Agronomy Vector (epidemiology) Geographic Information Systems Paddy field |
| Zdroj: | Vector-Borne and Zoonotic Diseases. 16:117-123 |
| ISSN: | 1557-7759 1530-3667 |
| DOI: | 10.1089/vbz.2014.1757 |
| Popis: | Vector mosquitoes of Japanese encephalitis (JE) breed mostly in rice fields, and human cases occur scattered over extended rural rice-growing areas. From this, one may surmise an ecological connection with the irrigation facilities and paddy cultivation. Furthermore, it has been hypothesized that a particular stage of paddy growth is a premonitory sign that can lead to a markedly increased population of the vector mosquitoes. The present study aimed to forecast the vector abundance by monitoring the paddy growth using remote sensing and geographical information systems. The abundance of the JE vector Culex tritaeniorhynchus peaked when the paddy crop was at its heading stage and dipped when the crop reached the maturing stage. A significant positive correlation was observed between paddy growth and adult density (r = 0.73, p < 0.008). The sigma naught values (σ0) derived from satellite images of paddy fields ranged from -18.3 (during transplantation stage) to approximately -10 (during the noncultivation period). A significant positive correlation was observed between σ0 and paddy growth stages (r = 0.87, p < 0.05) and adult vector density (r = 0.74, p = 0.04). The σ0 value observed during the vegetative and flowering stages of paddy growth ranged from -17.6 to -17.16, at which period the vector density started building up. This could be the spectral signature that denotes the "risk," following which a high vector abundance is expected during heading stage of the paddy. |
| Databáze: | OpenAIRE |
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