| geographic distribution and morphometric differentiation of triatoma nitida usinger 1939 (hemiptera: reduviidae: triatominae) in guatemala. | triatoma nitida was found in 14 (0.4%) out of 3,726 houses located in six departments across guatemala, which were surveyed from 1994 to 1998 by the man-hour collection method. compared to previous information, the distribution of t. nitida in guatemala has increased from five to nine departments; the species is present in mild climates at altitudes from 960 to 1,500 m. fourteen percent of the intradomestic t. nitida were infected with trypanosoma cruzi. the species was often found in conjunctio ... | 2003 | 12700860 |
| a mass collection of triatoma ryckmani (hemiptera: reduviidae) from stenocereus eichlamii (cactaceae) in the semiarid region of guatemala. | a population of 216 specimens of stenocereus eichlamii (cactaceae, subfamily cereoideae) was surveyed for triatoma ryckmani (vector of chagas disease) in a one hectare plot of semiarid habitat in guatemala. out of 44 plants that had dead and dry sections, 24 plants had a total of 103 specimens of t. ryckmani. in comparison with other areas of guatemala, t ryckmani is well established in the semiarid ecosystem (infestation index 54.5, density = 2.3 and crowding index 4.3). the insects were mainly ... | 2004 | 17354404 |
| cuticular hydrocarbon variability among triatoma dimidiata (hemiptera: reduviidae) populations from mexico and guatemala. | the geographic variation in the cuticular hydrocarbon pattern among 11 populations of triatoma dimidiata latreille (hemiptera: reduviidae: triatominae) from different regions of mexico and guatemala, was studied using capillary gas chromatography. t. dimidiata populations were differentiated based on the relative amounts of 71 hydrocarbon components. insect population classification was mostly in agreement with their geographical vicinity; mexican populations from the yucatan peninsula grouped t ... | 2005 | 16363161 |
| morphometric analysis of triatoma dimidiata populations (reduviidae:triatominae) from mexico and northern guatemala. | triatoma dimidiata is one of the major vectors of chagas disease in latin america. its range includes mexico, all countries of central america, colombia, and ecuador. in light of recent genetic analysis suggesting that the possible origin of this species is the yucatan peninsula, we have analyzed populations from the state of yucatan, san luis potosi, and veracruz in mexico, and a population from the southern region of the yucatan peninsula located in northern guatemala, the region of el peten. ... | 2005 | 16184224 |
| intraspecific variability in triatoma dimidiata (hemiptera: reduviidae) populations from guatemala based on chemical and morphometric analyses. | the intraspecific variability of triatoma dimidiata latreille, a major vector of chagas disease, was studied in four departments of guatemala. insects were collected from either domestic and sylvatic habitats, and their cuticular hydrocarbon pattern and head morphology were analyzed using ordination and classification techniques. a significant discrimination was obtained both with morphometric and hydrocarbon analyses. insects from northern departments were easily differentiated from southern co ... | 2005 | 15691005 |
| a preliminary assessment of genetic differentiation of triatoma dimidiata (hemiptera: reduviidae) in guatemala by random amplification of polymorphic dna-polymerase chain reaction. | the population genetics of triatoma dimidiata (latreille, 1811) from five different provinces in guatemala, including three sylvan and three domestic populations, was investigated by random amplification of polymorphic dna-polymerase chain reaction. there is a high degree of genetic variation in all of the t. dimidiata populations as evidenced by high levels of average expected heterozygosity and polymorphism. domestic populations are more closely related to each other (d = 0.05-0.085, nei's gen ... | 2004 | 15535616 |
| dispersion and colonization of triatoma ryckmani (hemiptera: reduviidae) in artificial environments in a semiarid region of a chagas disease endemic area in guatemala. | the colonization capacity and dispersal of sylvatic populations of triatoma ryckmani zeledón and ponce were investigated by means of experimental chicken coops installed within the semiarid region in the department of el progreso, guatemala. in the four artificial habitats a total of 672 t. ryckmani was found as well as two males of t. dimidiata (latreille). triatomine densities were not the same in the four chicken coops. from one chicken coop 53.4% (359) of the triatomines were collected. full ... | 2004 | 15234663 |
| triatoma ryckmani (hemiptera: reduviidae) in the epiphyte tillandsia xerographica (bromeliaceae) in the semiarid region of guatemala. | for the first time, the reduviid bug triatoma ryckmani zeledón and ponce (hemiptera; reduviidae) was recorded to inhabit the epiphyte tillandsia xerographica rohweder (bromeliaceae) in the semiarid region of guatemala. these bromeliads grow mainly in drought-resistant trees with rough bark such as pereskia lychnidiflora (cactaceae). in our study site, we investigated 30 t. xerographica, and 53 specimens of t. ryckmani were found. most t. ryckmani (68.5%) were unfed. ants (formicidae) were the pr ... | 2004 | 15185931 |
| habitats, dispersion and invasion of sylvatic triatoma dimidiata (hemiptera: reduviidae: triatominae) in petén, guatemala. | dispersion and invasion capacity of sylvatic populations of triatoma dimidiata (latreille) were investigated during 14 mo by means of experimental chicken coops installed in a nature reserve within the maya biosphere, petén, guatemala. in addition, palm trees, underground archeological holes (chultunes) and piles of limestones within the forest were inspected as potential sylvatic habitats of t. dimidiata. from the three types of sylvatic habitats we inspected, all served as shelter and breeding ... | 2003 | 14765656 |
| the chagas vector, triatoma dimidiata (hemiptera: reduviidae), is panmictic within and among adjacent villages in guatemala. | trypanosoma cruzi, the hemoflagellate parasite and cause of chagas disease in latin america, is carried by triatomine vectors, principally triatoma dimidiata and rhodnius prolixus in central america. to assist control efforts and to understand the epidemiology of the disease in guatemala, the population genetics of t. dimidiata was analyzed among three houses within a village and two adjacent villages in guatemala. eleven randomly amplified polymorphic dna-polymerase chain reaction (rapd-pcr) pr ... | 2003 | 14680107 |
| epidemiology of chagas disease in guatemala: infection rate of triatoma dimidiata, triatoma nitida and rhodnius prolixus (hemiptera, reduviidae) with trypanosoma cruzi and trypanosoma rangeli (kinetoplastida, trypanosomatidae). | a five-year domiciliary collection in the 22 departments of guatemala showed that out of 4,128 triatomines collected, 1,675 were triatoma dimidiata (latreille, 1811), 2,344 were rhodnius prolixus stal 1859, and only 109 were t. nitida usinger 1939. the chagas disease parasite, trypanosoma cruzi, was found in all three species. their natural infection rates were similar in the first two species (20.6%; 19.1%) and slightly lower in t. nitida(13.8%). however there was no significant difference in t ... | 2003 | 12886407 |