Morphometric evidence for a possible role of Rhodnius prolixus from palm trees in house re-infestation in the State of Barinas (Venezuela)

被引:68
作者
Dora Feliciangeli, M.
Sanchez-Martin, Maria
Marrero, Rosalba
Davies, Clive
Dujardin, Jean-Pierre
机构
[1] CNRS, UMR 2724, IRD, F-34394 Montpellier, France
[2] Univ London, London Sch Hyg & Trop Med, London, England
[3] Univ Carabobo, BIOMED CNRFV, Valencia, Venezuela
基金
英国惠康基金;
关键词
Rhodnius prolixus; Chagas disease; morphometrics; vector control; Venezuela;
D O I
10.1016/j.actatropica.2006.12.010
中图分类号
R38 [医学寄生虫学]; Q [生物科学];
学科分类号
07 ; 0710 ; 09 ; 100103 ;
摘要
The main vector of Chagas disease in Venezuela is Rhodnius prolixus. Specimens of Rhodnius sp., identified elsewhere as R. prolixus by molecular tools, were collected in Barinas State (Venezuela) before insecticide application, and compared by morphometric techniques with post-spraying, re-infesting insects after control. Geometric morphometry was applied, allowing separate analyses of shape and size. The idea of a single species sharing silvatic and domestic/peri-domestic ecotopes was supported, suggesting new evolutionary scenarios for the controversial R. prolixus origins. The same data allowed to understand the possible mechanisms of villages re-infestation after a control campaign, either recolonization by local recovery of survivors or re-infestation by external migrants. Both mechanisms were apparent. Although shape properties could distinguish very close subpopulations such as insects from houses and insects from peri-domestic shelters, they were unable to identify the insects from palm trees as a distinct subpopulation. This strongly suggested that human environment could receive immigrants from palm trees. The pattern of size variation supported the hypothesis of a one-way exchange from silvatic to human environments, but did not support the reverse movement. Thus, morphometric data indicated that a silvatic population of the local vector is probably responsible for re-infesting villages after insecticide application, and they also pointed to the existence of re-infestation by local recovery of survivors. According to this interpretation, new epidemiological scenarios must be considered to improve Chagas disease control in Venezuela. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:169 / 177
页数:9
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