Study of the impact of the anthropisation on the evolutionary ecology of the vectors of the disease of Chagas : the case of three communities of Tapajos, Brazilian Amazonia
type: Dataset
description: Anthropic disturbances from deforestation of Amazon tropical forest leads to a mosaic of landscapes composed of secondary vegetation (secondary forest, palm groves, fallows) and pasture. These changes result in the proliferation of invasive heliophilous palm trees of the family Attalea spp., the principal ecotope of Rhodnius species, bloodsucking bug vectors of Trypanosoma cruzi, the etiologic agent of Chagas disease in Latin America. The present study focuses on different land cover classes of three rural communities of the lower Tapajós (Brazilian Amazon) with different settlement times (25-75 years). Six different land-cover classes were identified on the field and applied through supervised classification on a SPOT 5 image of the study area in order to cartography environmental risk associated to palm tree presence in the area. Three hundred and thirty palms trees of three species Attalea maripa, A. phalerata and A.speciosa were dissected of which 73 (54.88%) were infested with R. robustus (742 insects collected). The distribution of palm species varied in each community, A.maripa was the only species found in the most recently settled community (Araipá). Significant decreases in bug density were observed in A.maripa, in the community most recently established (Araipá) and in the two most anthropogenic landcover classes.Infection of insects by T. cruzi and T. rangeli was examined using molecular methods (mini exon SL_IR and sno-RNA-C11). Respectively, 123 (16.57%) and 69 (9.3%) insects in 31 (23.3%) and 17 (13.32%) palms were identified as positive for T. cruzi and T. rangeli. A lack of infection was detected in Araipá but no differences were observed between the different land cover classes. The strains of Trypanosoma cruzi were identified using four distinct molecular markers (mini-exon SL-IR, GPI, HSP60 and D7-24α-rRNA) as belonging to the lineage TCI specifically TcId and 10 (8.13%) individuals showed a mixed infection TCI-TCII. Twenty host species divided i…
landing page: https://theses.hal.science/tel-00683009
identifier: NNT: 2011PEST1112
keyword: anthropisation-en-amazonie
keyword: anthropogenic-perturbations-in-amazon
keyword: attalea-spp
keyword: flux-geniques
keyword: gene-flow
keyword: genetic-structure
keyword: infoeu-reposemanticsdoctoralthesis
keyword: rhodnius-robustus
keyword: sdustusciences-of-the-universe-physicsearth-sciences
keyword: spiotherengineering-sciences-physicsother
keyword: structure-genetique
keyword: theses
keyword: trypanosoma-cruzi
issued: 2026-05-23T09:27:13.054615
modified: 2026-05-23T09:27:13.054621
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Study of the impact of the anthropisation on the evolutionary ecology of the vectors of the disease of Chagas : the case of three communities of Tapajos, Brazilian Amazonia
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00683009
issued: 2026-05-23T09:27:13.132198
modified: 2026-05-23T09:27:13.014022