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Éléments d'écologie de la transmission d'Echinococcus multilocularis en Chine (Sichuan) Modélisation des distributions spatiales des communautés et populations des hôtes : des données de terrain aux prédictions

Abstract : The transmission of the parasite Echinococcus multilocularis causing a fatal zoonosis in humans, the alveolar echinococcosis, can be modulated by anthropogenic disturbances of its intermediate (small mammals) and definitive (canids) host ecology. We studied some ecological parameters of those host populations in the Sichuan Province, China, where high human prevalences are observed. On the basis of trapping data sets, the definition of small mammal assemblages has provided a way to resume the large diversity observed in sampled habitats and trapped species. We found that multiple non-linear regressions was the most performant method to model assemblage distributions along environmental gradients extracted from satellite images, such as slope, elevation and vegetation indices. While local models were not transferable on study sites distant from one hundred km, a regional classification of transmission groups could have been realized on the whole regional data set. Then, analysis of spatial distributions of canid faeces, their contaminations as well as nocturnal trajectories of dogs equipped with GPS collars, were done to assess and quantify the predominant contribution of dog over fox in the environmental contamination and to localise areas of high transmission risk, closed to human habitations. Finally, spatial interactions between dogs and small mammals were found inside villages and can be considered as a preliminary estimation of host contact rate required in transmission models.
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https://tel.archives-ouvertes.fr/tel-00483842
Contributor : Amélie Vaniscotte <>
Submitted on : Monday, May 17, 2010 - 12:19:06 PM
Last modification on : Wednesday, December 2, 2020 - 9:56:09 AM
Long-term archiving on: : Friday, October 19, 2012 - 2:51:28 PM

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  • HAL Id : tel-00483842, version 1

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Amélie Vaniscotte. Éléments d'écologie de la transmission d'Echinococcus multilocularis en Chine (Sichuan) Modélisation des distributions spatiales des communautés et populations des hôtes : des données de terrain aux prédictions. Ecologie, Environnement. Université de Franche-Comté, 2009. Français. ⟨tel-00483842⟩

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