Morphometric evidence for a possible role of Rhodnius prolixus from palm trees in house re-infestation in the State of Barinas (Venezuela).
Acta Trop
; 101(2): 169-77, 2007 Feb.
Article
em En
| MEDLINE
| ID: mdl-17306204
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.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Rhodnius
/
Asas de Animais
/
Doença de Chagas
/
Arecaceae
/
Habitação
/
Insetos Vetores
Aspecto:
Determinantes_sociais_saude
Limite:
Animals
/
Female
/
Humans
/
Male
País/Região como assunto:
America do sul
/
Venezuela
Idioma:
En
Revista:
Acta Trop
Ano de publicação:
2007
Tipo de documento:
Article
País de afiliação:
Venezuela
País de publicação:
Holanda