Habitat suitability mapping of Anopheles darlingiin the surroundings of the Manso hydropower plant reservoir, Mato Grosso, Central Brazil

Zeilhofer Peter, Santos Emerson, Ribeiro, Miyazaki, Santos, Santos Marina

Description

Hydropower plants provide more than 78 % of Brazil's electricity generation, but the country's reservoirs are potential new habitats for main vectors of malaria. In a case study in the surroundings of the Manso hydropower plant in Mato Grosso state, Central Brazil, habitat suitability of Anopheles darlingi was studied. Habitat profile was characterized by collecting environmental data. Remote sensing and GIS techniques were applied to extract additional spatial layers of land use, distance maps, and relief characteristics for spatial model building. Results Logistic regression analysis and ROC curves indicate significant relationships between the environment and presence of An. darlingi . Probabilities of presence strongly vary as a function of land cover and distance from the lake shoreline. Vector presence was associated with spatial proximity to reservoir and semi-deciduous forests followed by Cerrado woodland. Vector absence was associated with open vegetation formations such as grasslands and agricultural areas. We suppose that non-significant differences of vector incidences between rainy and dry seasons are associated with the availability of anthropogenic breeding habitat of the reservoir throughout the year. Conclusion Satellite image classification and multitemporal shoreline simulations through DEM-based GIS-analyses consist in a valuable tool for spatial modeling of A. darlingi habitats in the studied hydropower reservoir area. Vector presence is significantly increased in forested areas near reservoirs in bays protected from wind and wave action. Construction of new reservoirs under the tropical, sub-humid climatic conditions should therefore be accompanied by entomologic studies to predict the risk of malaria epidemics.

Informations

• Publié par: biomed
• Publié le: 01 janvier 2007
• Nombre de lectures: 6
• Langue: English
• Poids de l'ouvrage: 2 Mo

Extrait

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Abstract Background: Hydropower plants provide more than 78 % of Brazil's electricity generation, but the country's reservoirs are potent ial new habitats for main vectors of malaria. In a case study in the surroundings of the Manso hydropower plant in Mato Grosso state, Central Brazil, habitat suitability of Anopheles darlingi was studied. Habitat profile wa s characterized by collecting environmental data. Remote sensin g and GIS techniques were applied to extract additional spatial layers of land use, distance maps, and relief characteristics for spatial model building. Results: Logistic regression analysis and ROC curves indicate significant relationships between the environment and presence of An. darlingi . Probabilities of presence strongly vary as a function of land cover and distance from the lake shorelin e. Vector presence was as sociated with spatial proximity to reservoir and semi-d eciduous forests followed by Cerrado woodland. Vector absence was associated with open vegetation formations such as grasslands and agricultural areas. We suppose that non-significant diff erences of vector incidences be tween rainy and dry seasons are associated with the availability of anthropogenic breeding habitat of the reservoir throughout the year. Conclusion: Satellite image classification and multitemporal shoreline simulations through DEM- based GIS-analyses consist in a valu able tool for spatial modeling of A. darlingi habitats in the studied hydropower reservoir area. Vector presence is significantly increased in forested areas near reservoirs in bays protected from wind and wave action. Constructi on of new reservoirs under the tropical, sub-humid climatic conditions should therefore be accompanied by entomologic studies to predict the risk of malaria epidemics.

Published: 7 March 2007 Received: 26 July 2006 International Journal of Health Geographics 2007, 6 :7 doi:10.1186/1476-072X-6-7  Accepted: 7 March 2007 This article is available from: http:// www.ij-healthgeographics.com/content/6/1/7 © 2007 Zeilhofer et al; licen see BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons. org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the orig inal work is properly cited.

Address: 1 Department of Geography, Federal University of Mato Grosso, Av. F. Corrêa, Cuiabá, Brazil, 2 Institute of Biology, Federal University of Mato Grosso, Av. F. Corrêa, Cuiabá, Brazil and 3 Institute of Public Health, Federal University of Mato Grosso, Av. F. Corrêa, Cuiabá, Brazil Email: Peter Zeilhofer* - [e-mail]; Emerson Soares dos Santos - [e-mail]; Ana LM Ribeiro - [e-mail]; Rosina D Miyazaki - [e-mail]; Mari na Atanaka dos Santos - [e-mail] * Corresponding author

Research Open Access Habitat suitability mapping of Anopheles darlingi in the surroundings of the Manso hydropower plant re servoir, Mato Grosso, Central Brazil Peter Zeilhofer* 1 , Emerson Soares dos Santos 1 , Ana LM Ribeiro 2 , Rosina D Miyazaki 2 and Marina Atanaka dos Santos 3

Background by Anopheles darlingi Root and four other dipters species of Malaria is caused by protozoan parasites of the genus Plas- the Anophelines genus: Anopheles aquasalis , Anopheles albi- modium and is transmitted, in Central Brazil, principally tarsis , Anopheles cruzi and Anopheles bellator . An. darlingi is