Efecto de la alternación de fuentes sanguíneas sobre la fecundidad y la fertilidad de Rhodnius prolixus Stal (Heteroptera: Reduviidae).

Abstract

Resumen. En este trabajo se evidencia que si el éxito reproductivo de Rhodnius prolixus Stål está relacionado a la fuente alimentaria, entonces las necesidades biológicas del insecto son satisfechas en modos diferentes según el tipo de alternancia entre dichas fuentes de alimentación; tales diferencias son reveladas mediante los cambios en fertilidad y fecundidad del insecto. Se realizaron nueve alternancias, en cada una se suministraron dos alimentaciones, en unas se alternó la fuente de alimentación y en los controles se suministraron dos alimentaciones con la misma fuente. Las fuentes alimentarias fueron paloma, gallina y humano, esta última mediante un aparato de alimentación artificial; estas fuentes se escogieron en el supuesto que son fuentes alimentarias encontradas en los ecotopos silvestre, peri-domicilio y domicilio respectivamente. En todos los tipos de alternancia se encontró una relación lineal entre la fecundidad y el tiempo de oviposición, que la relación entre cantidad de sangre ingerida y la fecundidad varían, que la tasa de fecundidad aumenta en la segunda alimentación respecto a la primera y que la fertilidad fue superior al 95 %.Palabras clave: Alimentación, Reproducción, Triatominae, Potencial Vectorial. Effects of Alternating Blood Sources on Fecundity and Fertility ofRhodnius prolixus Stål (Heteroptera: Reduviidae)Abstract. In this work it is argued that if the reproductive parameters of Rhodnius prolixus Stål are related to the blood source upon which it feeds, then the insects biological needs must be satisfied in different ways by the alternation between blood sources, reveled through changes in the fecundity and fertility of individuals of this insect species. Nine experiments were conducted, each one consisting of two feedings, in which the blood source were either alternated or remained the same. The meal sources used were pigeon, hen and human blood, selected according to the resources found in the sylvatic, peri-domestic and domestic ecotopes respectively. It was found that the quantity of blood ingested and the fecundity were differents according to alternation of blood sources offered in each meal. A linear relation was found between the fecundity and the time of oviposition in every alternation of meal sources. On the other hand there was a slope increase in the second feeding of every experiment. The fertility was above 95% in each experiment.

Host influence on the nutritional and reproductive status of Triatoma infestans (Klug) (Hemiptera: Reduviidae) peridomiciliary populations

“…These results were in disagreement with those proposed by several authors, who mention differences in nutritional quality and reproductive parameters between bugs feeding on mammalian versus avian hosts (Diotaiuti & Dias, 1987;Gomes et al, 1990;Guarneri et al, 2000;Nattero et al, 2011). In turn, the ingestion of combined blood sources did not result in significant differences in the number of chorionated oocytes present in females, in contrast to what was proposed by Aldana et al (2009). In this context, our findings are in line with the ones described by Jiron & Zeledón (1982) for T. infestans, who suggest a similar weight gain between the bugs being offered one or multiple sources of blood under experimental conditions, regardless of the host-feeding source.…”

“…For the analysis, T. infestans that fed on more than one host were grouped in two categories: (a) the mammalian-bird category, comprising insects that fed on chicken and on at least one mammalian host (dog, goat and/or human); (b) the mammalianmammalian category, comprising insects that fed on different mammalian hosts. This criterion was based on the extensive bibliography that demonstrated that the quality of blood from the selected hosts influenced the biological requirements of triatomines (Diotaiuti & Dias, 1987;Gomes et al, 1990;Aldana et al, 2009;Nattero et al, 2011).…”

Demographic and Dispersal Constraints for Domestic Infestation by Non-Domicilated Chagas Disease Vectors in the Yucatan Peninsula, Mexico

“…blood meals in the field would reduce survival and/or lower the number of eggs an adult female triatomine can lay. [29][30][31][32] Other hypotheses (e.g., higher mortality, leaving the houses, and not laying eggs because of maladaptation to the domiciliary conditions) could also explain the almost null fecundity, extremely low immature survival, and low adult survival required to fit our field data.…”

Seroprevalencia de la infección por Trypanosoma cruzi y factores asociados en un área endémica de Venezuela

“…Las gallinas son fuentes de alimento para los triatominos y su presencia en las aéreas domiciliarias impactan la ecología doméstica de la enfermedad de Chagas, ya que, incrementan la infestación del domicilio, conllevando a un incremento en el contacto del vector con los reservorios domésticos, aumentando de esta manera el número de triatominos infectados 35,36 . En este sentido ha sido sugerido que el éxito reproductivo de R. prolixus se ve favorecido con mayor fecundidad si en el domicilio ocurriera la ingesta con sangre humana, pero si previamente el insecto se ha alimentado sobre gallina 37 .…”