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Patrones de alimentación y de defecación de Triatoma rubrovaria (Heteroptera: Reduviidae) bajo condiciones de laboratorio Feeding and defecation patterns in Triatoma rubrovaria (Heteroptera: Reduviidae) under laboratory conditions  [cached]
María E. Bar,Alicia M. F. Milano,Miryam P. Damborsky,Elena B. Oscherov
Revista de la Sociedad Entomol?3gica Argentina , 2003,
Abstract: La capacidad de Triatoma rubrovaria Blanchard para colonizar la vivienda y alimentarse de sangre humana y sus índices de infección por Trypanosoma cruzi Chagas, justifican esta investigación. El objetivo fue caracterizar los patrones de alimentación y defecación en condiciones experimentales. Ambos patrones se evaluaron simultáneamente. Se utilizaron 30 ninfas de cuarto estadio, 30 de quinto y 30 adultos. Los ejemplares se alimentaron sobre ave (gallina) durante una hora. Se pesaron antes y después de la ingesta, calculándose por diferencia la cantidad de sangre ingerida. Se midió el tiempo en que ocurrió la primera defecación y siguientes. Se realizaron tres repeticiones para cada estadio ninfal y para el estado adulto. Se confirmó alimentación en 97,0% de los individuos, alimentándose a repleción el 84,7%. El ataque se inició en un tiempo promedio de 2 minutos. El 28,6% interrumpió la alimentación para defecar o por irritabilidad del huésped. En promedio las N5 consumieron más sangre que las N4 (358,1 y 120,9 mg respectivamente) y que los adultos (73,5 mg). Del total de individuos alimentados se verificó defecación en 92,4%. El tiempo promedio de la primera deyección fue de 1,7 minutos. Se concluye que T. rubrovaria mostró rapidez en la obtención del alimento y en la emisión de la primera defecación. Se discute su potencial como vector de T. cruzi. Triatoma rubrovaria Blanchard capability to colonize the domicile, to feed upon human and its Trypanosoma cruzi Chagas infection rates justify this investigation. The aim was to characterize the feeding and defecation patterns of T. rubrovaria under laboratory conditions. Both patterns were evaluated simultaneously using 30 fourth-instar and 30 fifth-instar nymphs, and 30 adults. Three repetitions for each nymphal stadium and for the adult stage were made. The insects were fed on chicken during one hour and were weighed before and after feeding, and the blood meal size was determined. The time of the first and subsequent defaecations were measured. It was confirmed blood ingestion in 97.0% of the triatomines and 84.7% fed to repletion. On average the attack time started after 2 minutes. Feeding interruption was observed in 28.6% and was due principally to defecate or as a consequence of host irritability. The mean amount of blood obtained by the fifth-instar nymphs was greater than the blood ingested by the fourth-instar (358.1 and 120.9 mg, respectively) and the adults (73.5 mg). Defecation was verified in the 92.4% of the feeding individuals. The first dejection was emitted on average at 1.7 minutes. It i
Patrones de alimentación y de defecación de Triatoma rubrovaria (Heteroptera: Reduviidae) bajo condiciones de laboratorio
Bar,María E.; Milano,Alicia M. F.; Damborsky,Miryam P.; Oscherov,Elena B.; Avalos,Gilberto;
Revista de la Sociedad Entomol?3gica Argentina , 2003,
Abstract: triatoma rubrovaria blanchard capability to colonize the domicile, to feed upon human and its trypanosoma cruzi chagas infection rates justify this investigation. the aim was to characterize the feeding and defecation patterns of t. rubrovaria under laboratory conditions. both patterns were evaluated simultaneously using 30 fourth-instar and 30 fifth-instar nymphs, and 30 adults. three repetitions for each nymphal stadium and for the adult stage were made. the insects were fed on chicken during one hour and were weighed before and after feeding, and the blood meal size was determined. the time of the first and subsequent defaecations were measured. it was confirmed blood ingestion in 97.0% of the triatomines and 84.7% fed to repletion. on average the attack time started after 2 minutes. feeding interruption was observed in 28.6% and was due principally to defecate or as a consequence of host irritability. the mean amount of blood obtained by the fifth-instar nymphs was greater than the blood ingested by the fourth-instar (358.1 and 120.9 mg, respectively) and the adults (73.5 mg). defecation was verified in the 92.4% of the feeding individuals. the first dejection was emitted on average at 1.7 minutes. it is concluded that t. rubrovaria was fast to obtain its bloodmeal and to emitt the first dejection. its potential as t. cruzi vector is discussed.
Algunos parámetros poblacionales de Triatoma guasayana Wygodzinsky & Abalos, 1941, bajo condiciones de laboratorio (Reduviidae, Triatominae)
Argüello, Nilda V. de;Markariani, Rosa M.;Civitta, Graciela la;Mischis, Catalina de;
Revista Brasileira de Zoologia , 1982, DOI: 10.1590/S0101-81751982000300006
Abstract: a statistical evolution of some populational parameters of triatoma guasayana was made, based on courtship experiments under controlled laboratory conditions. egg hatching, nymphal developmental time and mortality were computed and results compared with previous literature data.
Ciclo biológico de Triatoma rubrovaria (Blanchard) (Reduviidae, Triatominae) en laboratorio
Argüello, Nilda V. de;Mischis, Catalina C. de;Civitta, Graciela La;Bonino, Emma E.;
Revista Brasileira de Zoologia , 1988, DOI: 10.1590/S0101-81751988000200008
Abstract: a statistical evaluation of the life cycle of triatoma rubrovaria is based on cohort experiments conducted under controlled laboratory conditions. egg hatching, nymphal development time and mortality, adult male and femals longevity were computed, and the results compared with information in the existing literature.
Estadísticos poblacionales de Triatoma sordida St?l 1859 (Hemiptera : Reduviidae) en condiciones experimentales
Oscherov,Elena B.; Damborsky,Miryam P.; Bar,María E.; Porcel,Eduardo;
Revista de Saúde Pública , 1996, DOI: 10.1590/S0034-89101996000500006
Abstract: four cohorts of 100 triatoma sordida eggs were reared under standard laboratory conditions (28oc, 63% r.h.) and fed weekly on hens during 40 minutes. the numbers of dead insects, moults and eggs laid were recorded weekly. a constant survival value was observed without any important peaks in the four cohorts. life expectancy was 37.4 weeks for males and 36.8 weeks for females. the average generation time was 61.7 weeks. the average net reproduction rate suggests that this population would increase 143.2 times during each generation. the average intrinsic rate of natural increase was 0.082 per individual per week. the highest reproductive value was observed 3 weeks after entering the adult stage. the age structure, assuming stable age distribution, would be 32% eggs, 26% of first instar nymphs, 19% of second instar nymphs, 13% of third instar nymphs, 6% of fourth instar nymphs, 3% of fifth instar nymphs and 1% of adults. our results suggest that this species behaves as a k-strategist under experimental conditions.
Estadísticos poblacionales de Triatoma sordida St l 1859 (Hemiptera : Reduviidae) en condiciones experimentales  [cached]
Oscherov Elena B.,Damborsky Miryam P.,Bar María E.,Porcel Eduardo
Revista de Saúde Pública , 1996,
Abstract: Se realizó el seguimiento longitudinal de cuatro cohortes de 100 huevos cada una. Los insectos fueron criados a 28°C ± 3°C y 63 % ± 10% de humedad relativa, y alimentados cada siete días sobre gallina (Gallus domesticus), durante 40 min. Las cohortes fueron controladas una vez por semana. Se observó un valor constante de supervivencia en las cuatro cohortes, sin picos importantes. La expectativa de vida de los machos, en promedio, fue de 37,4 semanas y la de las hembras 36,8. El tiempo generacional demandó 61,7 semanas. La tasa reproductiva neta indica que esta población se incrementará 143,3 veces con cada generación. La tasa intrínseca de crecimiento natural fue de 0,082 por semana. El máximo valor reproductivo se verificó, en promedio, a la tercer semana del ingreso al estado adulto. La distribución estable de edades de T. sordida sería de 32% huevos, 26% ninfas de primer estadio, 19% ninfas de segundo estadio, 13% ninfas de tercer estadio, 6% ninfas de cuarto estadio, 3% ninfas de quinto estadio y 1% de adultos. Es la primera cita para Argentina sobre la tabla de vida de T. sordida. El análisis de estos parámetros permite considerar que esta especie se comporta como "K estratega", en condiciones experimentales.
Monitoring the domiciliary and peridomiciliary invasion process of Triatoma rubrovaria in the State of Rio Grande do Sul, Brazil
Almeida, Carlos Eduardo;Vinhaes, Marcio Costa;Almeida, Josimar Ribeiro de;Silveira, Antonio Carlos;Costa, Jane;
Memórias do Instituto Oswaldo Cruz , 2000, DOI: 10.1590/S0074-02762000000600003
Abstract: the presence of triatoma rubrovaria in brazil has only been confirmed in the states of paraná and rio grande do sul (rs), where it is found naturally infected with trypanosoma cruzi. in the wild environment it occurs in rocky habitats and has an eclectic diet, feeding from cockroaches, reptiles and mammals. data from the chagas disease control program obtained by the funda??o nacional de saúde, between 1975 and 1997, indicate a growing domiciliary and peridomiciliary invasion of t. rubrovaria in rs, where it has become the most frequently triatominae species captured in this state since the control of triatoma infestans. in order to monitor this process, we analyzed collection data derived from 22 years of control campaigns against t. infestans. collection data for triatomines from domestic habitats show an inverse relationship, with high numbers of t. infestans and low numbers of t. rubrovaria during 1976-1987, compared to the following ten years, 1986-1997, when the number of t. infestans dropped drastically and that of t. rubrovaria increased. there are no consistent indications of intradomiciliary colonization by t. rubrovaria, since only low numbers of nymphs have been captured in the intradomiciliary ecotopes. nevertheless, this species appears to have preadaptive characteristics for anthropic ecotopes, and should be kept under constant epidemiological surveillance.
Monitoring the domiciliary and peridomiciliary invasion process of Triatoma rubrovaria in the State of Rio Grande do Sul, Brazil  [cached]
Almeida Carlos Eduardo,Vinhaes Marcio Costa,Almeida Josimar Ribeiro de,Silveira Antonio Carlos
Memórias do Instituto Oswaldo Cruz , 2000,
Abstract: The presence of Triatoma rubrovaria in Brazil has only been confirmed in the States of Paraná and Rio Grande do Sul (RS), where it is found naturally infected with Trypanosoma cruzi. In the wild environment it occurs in rocky habitats and has an eclectic diet, feeding from cockroaches, reptiles and mammals. Data from the Chagas Disease Control Program obtained by the Funda o Nacional de Saúde, between 1975 and 1997, indicate a growing domiciliary and peridomiciliary invasion of T. rubrovaria in RS, where it has become the most frequently Triatominae species captured in this state since the control of Triatoma infestans. In order to monitor this process, we analyzed collection data derived from 22 years of control campaigns against T. infestans. Collection data for triatomines from domestic habitats show an inverse relationship, with high numbers of T. infestans and low numbers of T. rubrovaria during 1976-1987, compared to the following ten years, 1986-1997, when the number of T. infestans dropped drastically and that of T. rubrovaria increased. There are no consistent indications of intradomiciliary colonization by T. rubrovaria, since only low numbers of nymphs have been captured in the intradomiciliary ecotopes. Nevertheless, this species appears to have preadaptive characteristics for anthropic ecotopes, and should be kept under constant epidemiological surveillance.
índice de defecación y éxito reproductivo de Triatoma maculata (Hemiptera:Reduviidae)en condiciones de laboratorio
E Aldana,E Lizano
Revista de Biología Tropical , 2004,
Abstract: Se estudió el comportamiento reproductivo y de defecación de Triatoma maculata (Erichson 1848)alimentando artificialmente con sangre humana.Los estadios II y III mostraron mayor frecuencia de defecaciones (ID=0.6 n=40),el estadio V no alcanzó la diferenciación sexual, la fertilidad fue 55%(n=865),fecundidad 8 huevos/hembra/semana (n=26),22 días de desarrollo embrionario (n=477),longevidad de hembras 51 días (n=26),el tiempo intermuda aumenta progresivamente desde 35 días en el estadio I hasta 46 días en el estadio IV,el porcentaje de muda varió desde 0%en el estadio V hasta 63%en el estadio III,la mortalidad varió desde 8%en el estadio III hasta 100%en el estadio V (n=40).Los resultados del presente trabajo aportan evidencias que explican la menor capacidad vectorial y la baja densidad de T.maculata en el domicilio humano. Defecation index and reproductive success of Triatoma maculata (Hemiptera: Reduviidae) under laboratory conditions.The reproductive and defecating behavior of Triatoma maculata (Erichson 1848)was studied on animals from an university culture in Venezuela.This species does not reach the importance of Rhodnius prolixus Stal 1859 as Chagas disease vector in Venezuela.This study addressed the role of defecating frequency,an index of how dangerous the animals are for the human population,and its relationship with why T.maculata is a less important vector than R.prolixus .Human blood was fed to the insects through an artificial feeding device.The 2nd and 3rd instar nymphs defecated more frequently (Id=0.6,n=40),and our Vth instar nymphs did not complete sexual differentiation.Fertility was 55%(n=865)and fecundity 8 eggs/female/week (n=26). Egg incubation lasted 22 days (n=477).Female longevity was 51 days (n=26).Intermould time grew progressively from 35 days for 1st to 40 days for 4th instar nymphs (n=40).Mould percentage varied from 0% for Vth to 63%for 3rd instar nymphs.Mortality varied from 8% for 3rd to 100% for Vth instar nymphs.These results support evidences explaining the lesser vectorial capacity and low density of T.maculata in human domiciles, including reduced reproduction and defecation when the animal feeds on human blood.Rev.Biol.Trop.52(4): 927-930.Epub 2005 Jun 24.
índice de defecación y éxito reproductivo de Triatoma maculata (Hemiptera:Reduviidae)en condiciones de laboratorio
Aldana,E; Lizano,E;
Revista de Biología Tropical , 2004,
Abstract: defecation index and reproductive success of triatoma maculata (hemiptera: reduviidae) under laboratory conditions.the reproductive and defecating behavior of triatoma maculata (erichson 1848)was studied on animals from an university culture in venezuela.this species does not reach the importance of rhodnius prolixus stal 1859 as chagas disease vector in venezuela.this study addressed the role of defecating frequency,an index of how dangerous the animals are for the human population,and its relationship with why t.maculata is a less important vector than r.prolixus .human blood was fed to the insects through an artificial feeding device.the 2nd and 3rd instar nymphs defecated more frequently (id=0.6,n=40),and our vth instar nymphs did not complete sexual differentiation.fertility was 55%(n=865)and fecundity 8 eggs/female/week (n=26). egg incubation lasted 22 days (n=477).female longevity was 51 days (n=26).intermould time grew progressively from 35 days for 1st to 40 days for 4th instar nymphs (n=40).mould percentage varied from 0% for vth to 63%for 3rd instar nymphs.mortality varied from 8% for 3rd to 100% for vth instar nymphs.these results support evidences explaining the lesser vectorial capacity and low density of t.maculata in human domiciles, including reduced reproduction and defecation when the animal feeds on human blood.rev.biol.trop.52(4): 927-930.epub 2005 jun 24.
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